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WO2025000373A1 - Laterite nickel ore hydrometallurgy pre-neutralization system and method - Google Patents

Laterite nickel ore hydrometallurgy pre-neutralization system and method Download PDF

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Publication number
WO2025000373A1
WO2025000373A1 PCT/CN2023/104016 CN2023104016W WO2025000373A1 WO 2025000373 A1 WO2025000373 A1 WO 2025000373A1 CN 2023104016 W CN2023104016 W CN 2023104016W WO 2025000373 A1 WO2025000373 A1 WO 2025000373A1
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WIPO (PCT)
Prior art keywords
reaction tank
neutralization
unit
iron
value
Prior art date
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PCT/CN2023/104016
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French (fr)
Chinese (zh)
Inventor
许开华
张文杰
张坤
彭亚光
金国泉
刘文泽
许鹏云
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Pt Gem Indonesia New Energy Materials
Pt Qmb New Energy Materials
GEM Co Ltd Korea
Original Assignee
Pt Gem Indonesia New Energy Materials
Pt Qmb New Energy Materials
GEM Co Ltd Korea
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Application filed by Pt Gem Indonesia New Energy Materials, Pt Qmb New Energy Materials, GEM Co Ltd Korea filed Critical Pt Gem Indonesia New Energy Materials
Priority to PCT/CN2023/104016 priority Critical patent/WO2025000373A1/en
Priority to CN202380010000.7A priority patent/CN117083398A/en
Publication of WO2025000373A1 publication Critical patent/WO2025000373A1/en
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to the technical field of hydrometallurgy, and in particular to a laterite nickel ore hydrometallurgy pre-neutralization system and a pre-neutralization method.
  • the laterite nickel ore is treated with high-pressure acid leaching to selectively leach valuable metals such as Ni (nickel) and Co (cobalt) in the original ore, while impurities such as Fe (iron) and Al (aluminum) remain in the slag phase.
  • the wet high-pressure acid leaching process of laterite nickel ore includes: ore dressing-high-pressure leaching-pre-neutralization-CCD countercurrent washing-1 stage iron and aluminum precipitation-2 stage iron and aluminum precipitation-1 stage nickel and cobalt precipitation-2 stage nickel and cobalt precipitation.
  • the slurry After pre-neutralization, the slurry enters the CCD countercurrent washing process, and the slag in the pre-neutralization reaction tank is countercurrently washed in turn by 6 series-connected thickeners, and finally discharged from the bottom flow of the five thickeners of the CCD countercurrent washing process to the tailings filter press, and finally enters the tailings pond.
  • the method for producing nickel-cobalt hydroxide by wet smelting of laterite nickel ore disclosed in the patent document with publication number CN108913883A, in the production of the nickel-cobalt hydroxide, firstly, the laterite nickel ore is leached under pressure or at normal pressure to obtain a leached slurry; then the leached slurry is pre-neutralized to control the end point pH value to be 1.1-1.8; then the pre-neutralized slurry is iron- and aluminum-free to control the end point pH value to be 3.5-4.2, and compressed air is introduced during the process; the slurry after iron- and aluminum-free is CCD washed; the overflow after CCD washing is deeply impurity-free to control the end point pH value to be 4.8-5.2, and compressed air is introduced during the process; finally, the overflow after deep impurity-free is precipitated with lime milk to obtain a gypsum-nickel-cobalt hydroxide mixture, and the gy
  • the pre-neutralization treatment process mainly involves uniformly filling the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag, the lime milk and other neutralizing agents into a neutralization tank filled with high-pressure leaching slurry for neutralization, resulting in the difficulty in effectively regulating the amount of the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag and the lime milk added, which makes it easy to produce excessive or insufficient amounts of the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag and the lime milk, resulting in reduced economic benefits of the laterite nickel ore hydrometallurgy.
  • the purpose of the present invention is to overcome the above technical deficiencies, propose a laterite nickel ore hydrometallurgical pre-neutralization method, and solve the technical problem that the pre-neutralization treatment of laterite nickel ore hydrometallurgy in the prior art is difficult to control the addition of second-stage iron-aluminum slag, second-stage nickel-cobalt slag and lime milk, resulting in reduced production efficiency of laterite nickel ore hydrometallurgy.
  • a laterite nickel ore hydrometallurgical pre-neutralization system comprising:
  • a first neutralization unit connected to the iron precipitation unit
  • a second neutralization unit connected to the first neutralization unit
  • a control unit is connected to the first neutralization unit and the second neutralization unit, and is used to detect the pH value in the first neutralization unit and the second neutralization unit, and control the amount of iron-aluminum slag and nickel-cobalt slag added to the first neutralization unit and the amount of neutralizer added to the second neutralization unit according to the detected pH value.
  • the first neutralization unit includes a feeding device, a first reaction tank and a second reaction tank, the first reaction tank is connected to the discharge end of the iron precipitation unit, the feeding device is connected to the first reaction tank and is used to supply iron-aluminum slag and nickel-cobalt slag to the first reaction tank, the feeding end of the second reaction tank is connected to the first reaction tank, and the discharge end is connected to the second neutralization unit.
  • control unit includes a first control module and a pH monitor
  • the pH monitor is connected to the second reaction tank and is used to monitor the pH value of the slurry in the second reaction tank
  • first control module is connected to the pH monitor and the feeding device and is used to control the amount of iron-aluminum slag and nickel-cobalt slag supplied to the first reaction tank by the feeding device according to the pH value detected by the pH monitor.
  • the second neutralization unit includes a feed pump and a third reaction tank, a fourth reaction tank and a fifth reaction tank connected in sequence, the third reaction tank is connected to the discharge end of the first neutralization unit, and the feed pump is connected to the third reaction tank and the fourth reaction tank for passing a neutralizer into the third reaction tank and the fourth reaction tank.
  • control unit further includes a second control module and a pH detector, wherein the pH detector is connected to the fifth reaction tank and is used to monitor the pH value of the slurry in the fifth reaction tank.
  • the second control module is connected to the pH detector and the feed pump, and is used to control the amount of the neutralizer supplied by the feed pump to the third reaction tank and the fourth reaction tank according to the pH value detected by the pH detector.
  • the iron precipitation unit includes a sixth reaction tank and a feeding device, and the feeding device is connected to the sixth reaction tank and is used to add alum to the sixth reaction tank.
  • control unit is also used to detect the iron ion content in the sixth reaction tank and control whether the feeding device supplies alum according to the iron ion content.
  • the laterite nickel ore hydrometallurgical pre-neutralization system also includes a plurality of thickeners, each of which is arranged in sequence, the thickener at the head end is connected to the second neutralization unit, and the thickener at the tail end is used to reduce the iron ion content in the liquid phase of the bottom flow discharged from the thickener at the tail end and the nickel content in the solid phase by controlling the water intake.
  • the hydrometallurgical pre-neutralization system for laterite nickel ore has the following beneficial effects: by setting an iron settling unit, a first neutralization unit, a second neutralization unit and a control unit, the iron settling unit receives high-pressure leaching slurry, and by supplying sodium sulfate to the iron settling unit, the iron ion content in the received slurry is reduced; the first neutralization unit is connected to the iron settling unit, and can receive the slurry after the sodium sulfate is supplied, and can supply iron-aluminum slag and nickel-cobalt slag to make the iron-aluminum slag and the nickel-cobalt slag react with the acid in the slurry to neutralize the slurry; The acid in the slurry dissolves the iron and nickel in the iron-aluminum slag and the nickel-cobalt slag at the same time; the second neutralization unit is connected to the first neutralization unit,
  • the reaction conditions of the slurries in the iron settling unit, the first neutralization unit and the second neutralization unit with the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer can be controlled by the control unit at the same time, so that the amounts of the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer are within a suitable range, thereby enabling the amounts of iron ions and nickel ions in the slurry to be accurately controlled, thereby improving the economic benefits of laterite nickel ore hydrometallurgy.
  • the technical solution of the present invention further provides a laterite nickel ore hydrometallurgical pre-neutralization method, which is performed by the laterite nickel ore hydrometallurgical pre-neutralization system described in the claims, and comprises the following steps:
  • S400 inputting the slurry treated by the first neutralization unit into the second neutralization unit, adding a neutralizer to the second neutralization unit, detecting the pH value in the second neutralization unit and controlling the amount of the neutralizer added according to the pH value.
  • the step S200 also includes: detecting the iron ion content in the iron precipitation unit and controlling whether to supply alum according to the iron ion content; wherein, when the iron ion content is greater than 1g/L, the supply of alum is controlled, and when the iron ion content is lower than 1g/L, the supply of alum is controlled to be stopped.
  • step S300 includes:
  • the slurry treated by the sedimentation unit is input into the first reaction tank of the first neutralization unit, and iron-aluminum slag and nickel-cobalt slag are added into the first reaction tank;
  • the slurry after the neutralization reaction in the first reaction tank is input into the second reaction tank of the first neutralization unit, the pH value in the second reaction tank is detected and the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled according to the pH value.
  • the step of detecting the pH value in the second reaction tank and controlling the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank according to the pH value comprises:
  • the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to increase;
  • the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to be reduced.
  • the first threshold ranges from 0.9 to 1.1.
  • step S400 includes:
  • the slurry treated by the first neutralization unit is input into the third reaction tank of the second neutralization unit, and a neutralizing agent is added into the third reaction tank;
  • the slurry after the neutralization reaction in the third reaction tank is input into the fourth reaction tank of the second neutralization unit, and a neutralizing agent is added into the fourth reaction tank;
  • the slurry after the neutralization reaction in the fourth reaction tank is input into the fifth reaction tank of the second neutralization unit, the pH value in the fifth reaction tank is detected, and the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled according to the pH value.
  • the step of detecting the pH value in the fifth reaction tank and controlling the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank according to the pH value comprises:
  • the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to increase;
  • the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to be reduced.
  • the second threshold range is 1.5-2.
  • the beneficial effects of the laterite nickel ore hydrometallurgical pre-neutralization method provided by the present invention include: through the above treatment method of pre-neutralization, the iron removal process of the slurry, the dissolution and neutralization process of the iron-aluminum slag and the nickel-cobalt slag, and the neutralization process of the neutralizer can be carried out independently, and then the alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer can be accurately controlled according to the reaction of the slurry inside the iron precipitation unit, the first neutralization unit, and the second neutralization unit with the added alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer, and combined with the pH value in the first neutralization unit and the second neutralization unit, so that the amount of the added alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer is within a suitable range, and then the amount of
  • FIG1 is a schematic structural diagram of a laterite nickel ore hydrometallurgical pre-neutralization system provided in an embodiment of the present invention.
  • FIG2 is a flow chart of a laterite nickel ore hydrometallurgical pre-neutralization method provided in an embodiment of the present invention.
  • the reference numerals in the figure are: 10—Iron precipitation unit 11—Sixth reaction tank 20—First neutralization unit 21—first reaction tank 22—second reaction tank 30—second neutralization unit 31—third reaction tank 32—fourth reaction tank 33—fifth reaction tank 40—First end thickener 50—Tail end thickener
  • An embodiment of the present invention provides a laterite nickel ore hydrometallurgical pre-neutralization system, which is used in the pre-neutralization treatment process of laterite nickel ore hydrometallurgy, and includes an iron precipitation unit 10, a first neutralization unit 20, a second neutralization unit 20 and a control unit (not shown in the figure), wherein the first neutralization unit 20 is connected to the iron precipitation unit 10; the second neutralization unit 30 is connected to the first neutralization unit 20; the control unit is connected to the first neutralization unit 20 and the second neutralization unit 30, and is used to detect the pH value in the first neutralization unit and the second neutralization unit, and control the amount of iron-aluminum slag and nickel-cobalt slag added in the first neutralization unit and the amount of neutralizer added in the second neutralization unit according to the detected pH value.
  • the iron precipitation unit 10 receives the high-pressure leaching slurry, and by supplying sodium sulfate to the iron precipitation unit 10, the iron ion content in the received slurry is reduced.
  • the first neutralization unit 20 is connected to the iron precipitation unit 10, and can receive the slurry after the sodium sulfate is supplied, and can supply iron-aluminum slag and nickel-cobalt slag to make the iron-aluminum slag and nickel-cobalt slag react with the acid in the slurry, neutralize the acid in the slurry, and dissolve the iron-aluminum slag and nickel-cobalt slag at the same time.
  • the second neutralization unit 30 is connected to the first neutralization unit 20, and the first neutralization unit 20 can receive the slurry after the iron-aluminum slag and the nickel-cobalt slag are fed, and is used to neutralize the acid in the slurry by feeding the neutralizer.
  • the control unit can accurately control the feeding amount of the iron-aluminum slag and the nickel-cobalt slag in the first neutralization unit 20 and the neutralizer in the second neutralization unit 30 by detecting the pH value in the first neutralization unit 20 and the second neutralization unit 30, and finally realize the accurate control of the pH value in the slurry;
  • the first neutralization unit 20 and the second neutralization unit 30 Through the separate arrangement of the iron settling unit 10, the first neutralization unit 20 and the second neutralization unit 30, according to the reaction of the slurry inside the iron settling unit 10, the first neutralization unit 20 and the second neutralization unit 30 with the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer, and at the same time, through the precise control of the alum, iron-aluminum slag, nickel-cobalt slag and neutralizer by the control unit, the amount of the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer is within a suitable range, thereby being able to accurately control the amount of iron ions and nickel ions in the slurry, thereby improving the economic benefits of laterite nickel ore hydrometallurgy.
  • the hydrometallurgy of laterite nickel ore mainly includes ore dressing-high pressure leaching-pre-neutralization-CCD Countercurrent washing - 1 stage iron-aluminum precipitation - 2 stages iron-aluminum precipitation - 1 stage nickel-cobalt precipitation - 2 stages nickel-cobalt precipitation.
  • the pre-neutralization method is mainly used for the pre-neutralization after high-pressure leaching of laterite nickel ore hydrometallurgy, and in the CCD countercurrent washing process.
  • the iron-aluminum slag and nickel-cobalt slag are 2 stages of iron-aluminum slag and 2 stages of nickel-cobalt precipitation produced after 2 stages of iron-aluminum precipitation and 2 stages of nickel-cobalt precipitation.
  • a slurry with a temperature of about 95°C is formed.
  • the slurry contains iron ions and residual acid.
  • the iron ion content of the slurry is about 5g/L, and the residual acid content is 45-50g/L.
  • the iron sinking unit 10, the first neutralization unit 20 and the second neutralization unit 30 can be composed of one or more sections of tank bodies.
  • the control unit controls the amount of sodium sulfate added to the slurry so that the iron ion content of the slurry after the reaction is less than 1g/L. Specifically, by controlling the iron ions of the slurry after the reaction to be less than 1g/L, the iron ions in the slurry can be effectively removed, and the amount of sodium sulfate added can be effectively controlled to avoid excessive sodium sulfate.
  • the first neutralization unit 20 includes a feeding device (not marked in the figure), a first reaction tank 21 and a second reaction tank 22.
  • the first reaction tank 21 is connected to the discharge end of the iron precipitation unit 10, and the feeding device is connected to the first reaction tank 21 for supplying iron-aluminum slag and nickel-cobalt slag to the first reaction tank 21.
  • the feeding end of the second reaction tank 22 is connected to the first reaction tank 21, and the discharge end of the second reaction tank is connected to the second neutralization unit 30.
  • the feeding equipment can provide iron-aluminum slag and nickel-cobalt slag to the first reaction tank 21.
  • the first reaction tank 21 can allow the iron-aluminum slag and nickel-cobalt slag to react with the slurry, dissolve the metal oxides such as iron, aluminum, nickel and cobalt in the iron-aluminum slag and nickel-cobalt slag, and form corresponding ion structures.
  • the second reaction tank 22 can receive the slurry after the reaction. Through the sufficient reaction and standing of the first reaction tank 21, a relatively pure slurry after the reaction can be obtained.
  • the pH value of the slurry is made between 0.9 and 1.1.
  • the slurry can dissolve the iron-aluminum slag and nickel-cobalt slag with the maximum efficiency, that is, if the pH value of the slurry is higher than 1.1, it means that the amount of iron-aluminum slag and nickel-cobalt slag fed is too much, resulting in the inability of the excess iron-aluminum slag and nickel-cobalt slag to be effectively dissolved under the acidic conditions, and if the pH value is lower than 0.9, it means that the amount of iron-aluminum slag and nickel-cobalt slag fed is insufficient, and the acidity of the slurry can still dissolve more iron-aluminum slag and nickel-cobalt s
  • control unit includes a first control module and a pH monitor.
  • the second reaction tank 22 is connected to monitor the pH value of the slurry in the second reaction tank 22, and the first control module is connected to the pH monitor and the feeding equipment to control the amount of iron-aluminum slag and nickel-cobalt slag supplied to the first reaction tank 21 by the feeding equipment according to the pH value detected by the pH monitor.
  • the pH monitor can effectively obtain the pH of the slurry after the reaction with the iron-aluminum slag and the nickel-cobalt slag by monitoring the pH value of the slurry in the second reaction tank 22.
  • the pH monitor can automatically control the amount of iron-aluminum slag and nickel-cobalt slag added by detecting the pH value of the slurry in the second reaction tank 22 and controlling the feeding equipment by the first control module. While reducing manpower, it can effectively and accurately control the pH of the slurry after the reaction with the iron-aluminum slag and the nickel-cobalt slag, as well as the amount of iron-aluminum slag and nickel-cobalt slag added.
  • the second neutralization unit 30 includes a feed pump (not marked in the figure) and a third reaction tank 31, a fourth reaction tank 32 and a fifth reaction tank 33 connected in sequence, the third reaction tank 31 is connected to the discharge end of the first neutralization unit 20, and the feed pump is connected to the third reaction tank 31 and the fourth reaction tank 32, and is used to pass the neutralizer into the third reaction tank 31 and the fourth reaction tank 32.
  • the feed pump can provide a neutralizer to the third reaction tank 31 and the fourth reaction tank 32.
  • the third reaction tank 31 and the fourth reaction tank 32 can provide the neutralizer to react with the slurry.
  • the slurry is neutralized to increase the pH of the slurry.
  • the second reaction tank 22 can receive the slurry after the reaction. Through the sufficient reaction and standing of the first reaction tank 21, a relatively pure slurry after the reaction can be obtained.
  • the pH value of the slurry after adding the neutralizer is between 1.5 and 2.0.
  • the laterite nickel ore hydrometallurgical pre-neutralization system also includes a second control module (not marked in the figure), the control unit also includes a second control module and a pH detector, the pH detector is connected to the fifth reaction tank 33, and is used to monitor the pH value of the slurry in the fifth reaction tank 33.
  • the second control module is connected to the pH detector and the feed pump, and is used to control the amount of neutralizer supplied to the third reaction tank 31 and the fourth reaction tank 32 by the feed pump according to the pH value detected by the pH detector.
  • the pH detector can effectively obtain the pH of the slurry after reacting with the neutralizer by monitoring the pH value of the slurry in the fifth reaction tank 33.
  • the pH detector can realize automatic control of the amount of neutralizer added by detecting the pH value of the slurry in the fifth reaction tank 33 and controlling the feeding equipment by the second control module, thereby reducing manpower and effectively and accurately controlling the pH of the slurry after reacting with the neutralizer and the amount of neutralizer added.
  • the iron precipitation unit 10 includes a sixth reaction tank 11 , which receives the high-pressure leaching slurry and provides for the reaction of sodium sulphate with the high-pressure leaching slurry.
  • control unit is also used to detect the iron ion content in the sixth reaction tank 11, and control whether the feeding device feeds sodium sulfate according to the iron ion content. Specifically, the control unit can accurately control the amount of sodium sulfate added by detecting the iron ion content.
  • the entire pre-neutralization process can be automatically controlled, thereby effectively reducing the manpower consumed in the pre-neutralization process.
  • the laterite nickel ore hydrometallurgical pre-neutralization system further includes a plurality of thickeners, each of which is arranged in sequence, and the thickener at the head end is connected to the second neutralization unit 30, and the tail end thickener 50 is used to reduce the iron ion content in the liquid phase of the bottom flow discharged from the tail end thickener 50 and the nickel content in the solid phase by controlling the water inflow.
  • the liquid phase of the bottom flow discharged from the tail end thickener 50 can be made to account for 50-60%, and by detecting the iron ions in the liquid phase of the bottom flow and the nickel in the solid phase, the content of iron ions and nickel ions in the slurry in the tail end thickener 50 can be relatively accurately reflected, and then the overflow of iron, nickel and cobalt from one thickener can be effectively reflected.
  • the number of thickeners is 6, the head-end thickener 40 is connected to the fifth reaction tank 33, and the bottom flow discharged from each thickener flows into the next thickener until it enters the tail-end thickener 50 and is discharged from the tail-end thickener 50; clean water is added to the tail-end thickener 50, and will overflow from the tail-end thickener 50 in sequence until it enters the head-end thickener 40, and finally enters the iron precipitation workshop from the head-end thickener 40.
  • An embodiment of the present invention further provides a laterite nickel ore hydrometallurgical pre-neutralization method, which is performed by the laterite nickel ore hydrometallurgical pre-neutralization system, as shown in FIG2 , and includes the following steps:
  • S400 inputting the slurry treated by the first neutralization unit 20 into the second neutralization unit 30, adding a neutralizer to the second neutralization unit 30, detecting the pH value in the second neutralization unit 30 and controlling the amount of the neutralizer added according to the pH value.
  • step S300 the pH value of the slurry after adding the iron-aluminum slag and the nickel-cobalt slag is monitored online by the pH monitor, and the first control module controls the feeding device to reduce or increase the amount of the iron-aluminum slag and the nickel-cobalt slag through the pH value monitored by the pH monitor, so as to control the pH value monitored by the pH monitor to be within the first threshold range, wherein the first threshold range is between 0.9 and 1.1.
  • the automatic control of the efficient feeding process of the iron-aluminum slag and the nickel-cobalt slag can be realized, thereby effectively reducing the intensity of the pre-neutralization process.
  • the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to increase;
  • the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to be reduced.
  • the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to increase;
  • the amount of the neutralizer added to the third reaction tank and the fourth reaction tank is controlled to be reduced.
  • the second control module controls the feed pump to increase the amount of neutralizer input into the third reaction tank 31 and the fourth reaction tank 32; when the pH value monitored by the pH detector is greater than 2.0, the second control module controls the feed pump to reduce the amount of neutralizer input into the third reaction tank 31 and the fourth reaction tank 32.
  • the detection module detects the iron ion content in the slurry after adding sodium sulfate, and controls whether to feed sodium sulfate according to the iron ion content; when the detection module detects that the iron ion content is greater than 1g/L, the control unit controls the feeding device to feed sodium sulfate into the slurry, and when the detection module detects that the iron ion content is less than 1g/L, the control unit controls the feeding device to stop feeding sodium sulfate into the slurry.
  • the detection module can be a 3S-CL-Fe iron ion online analyzer, which detects the content of iron ions in the sixth reaction tank 11 through online sampling and analysis by the online analyzer, or through a color reaction, 1,10-phosphdiazoxide reacts with the iron ions in the sampled solution to turn it into an orange solution; or the iron ion content is determined by quantitative analysis of absorbance; or through a combination of an online analyzer, a color reaction and absorbance determination.
  • 3S-CL-Fe iron ion online analyzer which detects the content of iron ions in the sixth reaction tank 11 through online sampling and analysis by the online analyzer, or through a color reaction, 1,10-phosphdiazoxide reacts with the iron ions in the sampled solution to turn it into an orange solution
  • the iron ion content is determined by quantitative analysis of absorbance; or through a combination of an online analyzer, a color reaction and absorbance determination.
  • the neutralizing agent is one or more of limestone, lime milk and sodium hydroxide. Specifically, by providing a combination of one or more of limestone, lime milk and sodium hydroxide, efficient neutralization of the slurry can be achieved.

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Abstract

A laterite nickel ore hydrometallurgy pre-neutralization system and method. The pre-neutralization system comprises an iron precipitation unit (10), a first neutralization unit (20), a second neutralization unit (30), and a control unit. The iron precipitation unit (10) receives high-pressure leaching slurry. The first neutralization unit (20) is connected to the iron precipitation unit (10) and can receive slurry formed after anhydrous sodium sulfate is supplied, and iron-aluminum slag and nickel-cobalt slag can be supplied. The second neutralization unit (30) is connected to the first neutralization unit (20). The first neutralization unit (20) can receive the slurry formed after the iron-aluminum slag and the nickel-cobalt slag are supplied, and is used for neutralizing acid in the slurry by supplying a neutralizer. The iron precipitation unit (10), the first neutralization unit (20), and the second neutralization unit (30) are arranged separately, and additionally, the control unit precisely controls the anhydrous sodium sulfate, the iron-aluminum slag, the nickel-cobalt slag and the neutralizer, so that the amounts of the added anhydrous sodium sulfate, iron-aluminum slag, nickel-cobalt slag and neutralizer can be within an appropriate range, and the economic benefit of laterite nickel ore hydrometallurgy is improved.

Description

红土镍矿湿法冶金预中和系统及预中和方法Laterite nickel ore hydrometallurgical pre-neutralization system and pre-neutralization method 技术领域Technical Field

本发明涉及湿法冶金技术领域，尤其是涉及一种红土镍矿湿法冶金预中和系统及预中和方法。The invention relates to the technical field of hydrometallurgy, and in particular to a laterite nickel ore hydrometallurgy pre-neutralization system and a pre-neutralization method.

背景技术Background Art

红土镍矿经过高压酸浸处理，选择性浸出原矿中Ni(镍)和Co(钴)等有价金属，Fe(铁)和Al(铝)等杂质停留在渣相。红土镍矿湿法高压酸浸工艺包括:选矿-高压浸出-预中和-CCD逆流洗涤-1段沉铁铝-2段沉铁铝-1段沉镍钴-2段沉镍钴。预中和后，浆料进入CCD逆流洗涤工序，通过6台串联的浓密机对预中和反应罐中的矿渣依次进行逆流洗涤，最后由CCD逆流洗涤工序的五浓密机底流外排至尾渣压滤，最后进入尾矿库。The laterite nickel ore is treated with high-pressure acid leaching to selectively leach valuable metals such as Ni (nickel) and Co (cobalt) in the original ore, while impurities such as Fe (iron) and Al (aluminum) remain in the slag phase. The wet high-pressure acid leaching process of laterite nickel ore includes: ore dressing-high-pressure leaching-pre-neutralization-CCD countercurrent washing-1 stage iron and aluminum precipitation-2 stage iron and aluminum precipitation-1 stage nickel and cobalt precipitation-2 stage nickel and cobalt precipitation. After pre-neutralization, the slurry enters the CCD countercurrent washing process, and the slag in the pre-neutralization reaction tank is countercurrently washed in turn by 6 series-connected thickeners, and finally discharged from the bottom flow of the five thickeners of the CCD countercurrent washing process to the tailings filter press, and finally enters the tailings pond.

如公开号为CN108913883A的专利文件公开的红土镍矿湿法冶炼生产镍钴氢氧化物的方法，该镍钴氢氧化物的生产中，先加压浸出或常压浸出红土镍矿得到浸出矿浆；再对浸出矿浆进行预中和处理，控制终点pH值为1.1-1.8；再对经过预中和处理的矿浆除铁铝，控制终点pH值为3.5-4.2，过程中通入压缩空气；对除铁铝之后的矿浆进行CCD洗涤后；经过CCD洗涤的溢流进行深度除杂，控制终点pH值为4.8-5.2，过程中通入压缩空气；最后采用石灰乳对经过深度除杂的溢流进行沉淀，得到石膏-氢氧化镍钴混合物，分离石膏-氢氧化镍钴混合物，获得氢氧化镍钴产品。For example, the method for producing nickel-cobalt hydroxide by wet smelting of laterite nickel ore disclosed in the patent document with publication number CN108913883A, in the production of the nickel-cobalt hydroxide, firstly, the laterite nickel ore is leached under pressure or at normal pressure to obtain a leached slurry; then the leached slurry is pre-neutralized to control the end point pH value to be 1.1-1.8; then the pre-neutralized slurry is iron- and aluminum-free to control the end point pH value to be 3.5-4.2, and compressed air is introduced during the process; the slurry after iron- and aluminum-free is CCD washed; the overflow after CCD washing is deeply impurity-free to control the end point pH value to be 4.8-5.2, and compressed air is introduced during the process; finally, the overflow after deep impurity-free is precipitated with lime milk to obtain a gypsum-nickel-cobalt hydroxide mixture, and the gypsum-nickel-cobalt hydroxide mixture is separated to obtain a nickel-cobalt hydroxide product.

虽然现有的红土镍矿湿法冶炼通过预中和处理可实现对高压浸出后浆料pH值的控制，方便实现镍和钴的生产，但由于预中和处理过程中主要通过将二段铁铝渣、二段镍钴渣和石灰乳等中和剂统一填入装有高压浸出浆料的中和池内进行中和，导致加入二段铁铝渣、二段镍钴渣以及石灰乳的量难以得到有效调控，进而使得填入的二段铁铝渣、二段镍钴渣以及石灰乳的容易产生过量或不足，导致红土镍矿湿法冶炼的经济效益降低。 Although the existing laterite nickel ore hydrometallurgy can achieve the control of the pH value of the slurry after high-pressure leaching through pre-neutralization treatment, which is convenient for the production of nickel and cobalt, the pre-neutralization treatment process mainly involves uniformly filling the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag, the lime milk and other neutralizing agents into a neutralization tank filled with high-pressure leaching slurry for neutralization, resulting in the difficulty in effectively regulating the amount of the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag and the lime milk added, which makes it easy to produce excessive or insufficient amounts of the second-stage iron-aluminum slag, the second-stage nickel-cobalt slag and the lime milk, resulting in reduced economic benefits of the laterite nickel ore hydrometallurgy.

发明内容Summary of the invention

本发明的目的在于克服上述技术不足，提出一种红土镍矿湿法冶金预中和方法，解决现有技术中红土镍矿湿法冶金的预中和处理难以控制加入二段铁铝渣、二段镍钴渣以及石灰乳，导致红土镍矿湿法冶金的生产效益降低的技术问题。The purpose of the present invention is to overcome the above technical deficiencies, propose a laterite nickel ore hydrometallurgical pre-neutralization method, and solve the technical problem that the pre-neutralization treatment of laterite nickel ore hydrometallurgy in the prior art is difficult to control the addition of second-stage iron-aluminum slag, second-stage nickel-cobalt slag and lime milk, resulting in reduced production efficiency of laterite nickel ore hydrometallurgy.

为实现上述目的，本发明的技术方案提供一种红土镍矿湿法冶金预中和系统，包括：To achieve the above object, the technical solution of the present invention provides a laterite nickel ore hydrometallurgical pre-neutralization system, comprising:

沉铁单元；Iron sinking unit;

第一中和单元，与所述沉铁单元连接；A first neutralization unit connected to the iron precipitation unit;

第二中和单元，与第一中和单元连接；A second neutralization unit connected to the first neutralization unit;

控制单元，与所述第一中和单元和第二中和单元连接，用于检测所述第一中和单元和第二中和单元内的pH值，并根据其检测的pH值分别控制所述第一中和单元内铁铝渣、镍钴渣的加入量及所述第二中和单元内中和剂的加入量。A control unit is connected to the first neutralization unit and the second neutralization unit, and is used to detect the pH value in the first neutralization unit and the second neutralization unit, and control the amount of iron-aluminum slag and nickel-cobalt slag added to the first neutralization unit and the amount of neutralizer added to the second neutralization unit according to the detected pH value.

可选地，所述第一中和单元包括进料设备、第一反应罐和第二反应罐，所述第一反应罐与所述沉铁单元的出料端连接，所述进料设备与所述第一反应罐连接，用于向所述第一反应罐供入铁铝渣和镍钴渣，所述第二反应罐的进料端与所述第一反应罐连接、出料端与所述第二中和单元连接。Optionally, the first neutralization unit includes a feeding device, a first reaction tank and a second reaction tank, the first reaction tank is connected to the discharge end of the iron precipitation unit, the feeding device is connected to the first reaction tank and is used to supply iron-aluminum slag and nickel-cobalt slag to the first reaction tank, the feeding end of the second reaction tank is connected to the first reaction tank, and the discharge end is connected to the second neutralization unit.

可选地，所述控制单元包括第一控制模块和pH监测仪，所述pH监测仪与所述第二反应罐连接，用于监测所述第二反应罐内浆料的pH值，所述第一控制模块与所述pH监测仪和所述进料设备连接，用于通过所述pH监测仪检测的pH值，控制所述进料设备供入所述第一反应罐的铁铝渣和镍钴渣的量。Optionally, the control unit includes a first control module and a pH monitor, the pH monitor is connected to the second reaction tank and is used to monitor the pH value of the slurry in the second reaction tank, and the first control module is connected to the pH monitor and the feeding device and is used to control the amount of iron-aluminum slag and nickel-cobalt slag supplied to the first reaction tank by the feeding device according to the pH value detected by the pH monitor.

可选地，所述第二中和单元包括进料泵和依序连接的第三反应罐、第四反应罐和第五反应罐，所述第三反应罐与所述第一中和单元的出料端连接，所述进料泵与所述第三反应罐和所述第四反应罐连接，用于向所述第三反应罐和所述第四反应罐通入中和剂。Optionally, the second neutralization unit includes a feed pump and a third reaction tank, a fourth reaction tank and a fifth reaction tank connected in sequence, the third reaction tank is connected to the discharge end of the first neutralization unit, and the feed pump is connected to the third reaction tank and the fourth reaction tank for passing a neutralizer into the third reaction tank and the fourth reaction tank.

可选地，所述控制单元还包括第二控制模块和pH检测仪，所述pH检测仪与所述第五反应罐连接，用于监测所述第五反应罐内浆料的pH值，所 述第二控制模块与所述pH检测仪和所述进料泵连接，用于通过所述pH检测仪检测的pH值，控制所述进料泵供入所述第三反应罐和所述第四反应罐的中和剂的量。Optionally, the control unit further includes a second control module and a pH detector, wherein the pH detector is connected to the fifth reaction tank and is used to monitor the pH value of the slurry in the fifth reaction tank. The second control module is connected to the pH detector and the feed pump, and is used to control the amount of the neutralizer supplied by the feed pump to the third reaction tank and the fourth reaction tank according to the pH value detected by the pH detector.

可选地，所述沉铁单元包括第六反应罐及加料设备，所述加料设备与第六反应罐连接并用于向第六反应罐加入元明粉。Optionally, the iron precipitation unit includes a sixth reaction tank and a feeding device, and the feeding device is connected to the sixth reaction tank and is used to add alum to the sixth reaction tank.

可选地，所述控制单元还用于检测所述第六反应罐内铁离子含量并根据铁离子含量控制所述加料设备是否供入元明粉。Optionally, the control unit is also used to detect the iron ion content in the sixth reaction tank and control whether the feeding device supplies alum according to the iron ion content.

可选地，红土镍矿湿法冶金预中和系统还包括若干浓密机，各所述浓密机依序排列，首端的所述浓密机与所述第二中和单元连接，尾端所述浓密机用于通过控制进水量，减小尾端所述浓密机外排的底流的液相中铁离子含量以及固相中镍的含量。Optionally, the laterite nickel ore hydrometallurgical pre-neutralization system also includes a plurality of thickeners, each of which is arranged in sequence, the thickener at the head end is connected to the second neutralization unit, and the thickener at the tail end is used to reduce the iron ion content in the liquid phase of the bottom flow discharged from the thickener at the tail end and the nickel content in the solid phase by controlling the water intake.

与现有技术相比，本发明提供的红土镍矿湿法冶金预中和系统的有益效果包括：通过设置沉铁单元、第一中和单元、第二中和单元和控制单元，沉铁单元承接高压浸出浆料，通过向沉铁单元供入元明粉，降低承接的浆料中的铁离子含量，第一中和单元与沉铁单元连接，可承接供入的元明粉后的浆料，并可通过供入铁铝渣和镍钴渣，使铁铝渣和镍钴渣与浆料中的酸反应，中和浆料中的酸，同时溶解铁铝渣和镍钴渣中的铁和镍；第二中和单元与第一中和单元连接，第一中和单元可承接供入铁铝渣和镍钴渣后的浆料，并用于通过供入中和剂，中和浆料中的酸，控制单元通过检测第一中和单元和第二中和单元内的pH值，可实现对第一中和单元铁铝渣和镍钴渣，以及第二中和单元中和剂的供入量的精确控制，最终实现对浆料中的PH值的精确控制；Compared with the prior art, the hydrometallurgical pre-neutralization system for laterite nickel ore provided by the present invention has the following beneficial effects: by setting an iron settling unit, a first neutralization unit, a second neutralization unit and a control unit, the iron settling unit receives high-pressure leaching slurry, and by supplying sodium sulfate to the iron settling unit, the iron ion content in the received slurry is reduced; the first neutralization unit is connected to the iron settling unit, and can receive the slurry after the sodium sulfate is supplied, and can supply iron-aluminum slag and nickel-cobalt slag to make the iron-aluminum slag and the nickel-cobalt slag react with the acid in the slurry to neutralize the slurry; The acid in the slurry dissolves the iron and nickel in the iron-aluminum slag and the nickel-cobalt slag at the same time; the second neutralization unit is connected to the first neutralization unit, the first neutralization unit can receive the slurry after the iron-aluminum slag and the nickel-cobalt slag are fed, and is used to neutralize the acid in the slurry by feeding a neutralizer, and the control unit can accurately control the feeding amount of the iron-aluminum slag and the nickel-cobalt slag in the first neutralization unit and the second neutralization unit by detecting the pH value in the first neutralization unit and the second neutralization unit, and finally realize accurate control of the pH value in the slurry;

由于沉铁单元、第一中和单元和第二中和单元单独设置，使得可根据沉铁单元、第一中和单元和第二中和单元内部浆料与添加的元明粉、铁铝渣和镍钴渣、中和剂的反应情况，同时，通过控制单元对元明粉、铁铝渣和镍钴渣、中和剂的精确控制，使得添加的元明粉、铁铝渣和镍钴渣、中和剂的量处于合适的范围内，进而能够将浆料中的铁离子和镍离子的量得到精确控制，提升红土镍矿湿法冶金的经济效益。 Since the iron settling unit, the first neutralization unit and the second neutralization unit are separately arranged, the reaction conditions of the slurries in the iron settling unit, the first neutralization unit and the second neutralization unit with the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer can be controlled by the control unit at the same time, so that the amounts of the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer are within a suitable range, thereby enabling the amounts of iron ions and nickel ions in the slurry to be accurately controlled, thereby improving the economic benefits of laterite nickel ore hydrometallurgy.

为实现上述目的，本发明的技术方案还提供一种红土镍矿湿法冶金预中和方法，通过权利要求所述的红土镍矿湿法冶金预中和系统执行，包括以下步骤：To achieve the above-mentioned object, the technical solution of the present invention further provides a laterite nickel ore hydrometallurgical pre-neutralization method, which is performed by the laterite nickel ore hydrometallurgical pre-neutralization system described in the claims, and comprises the following steps:

S100：将高压浸出浆料通入沉铁单元；S100: passing the high-pressure leaching slurry into the iron precipitation unit;

S200：向所述沉铁单元加入元明粉，降低浆料中铁离子含量；S200: adding sodium sulfate to the iron precipitation unit to reduce the iron ion content in the slurry;

S300：将沉降单元处理后的浆料输入第一中和单元，向所述第一中和单元加入铁铝渣和镍钴渣，检测第一中和单元内的pH值并根据pH值控制铁铝渣和镍钴渣的加入量；S300: inputting the slurry treated by the sedimentation unit into the first neutralization unit, adding iron-aluminum slag and nickel-cobalt slag to the first neutralization unit, detecting the pH value in the first neutralization unit and controlling the amount of iron-aluminum slag and nickel-cobalt slag added according to the pH value;

S400：将第一中和单元处理后的浆料输入第二中和单元，向所述第二中和单元加入中和剂，检测第二中和单元内的pH值并根据pH值控制中和剂的加入量。S400: inputting the slurry treated by the first neutralization unit into the second neutralization unit, adding a neutralizer to the second neutralization unit, detecting the pH value in the second neutralization unit and controlling the amount of the neutralizer added according to the pH value.

可选地，所述步骤S200还包括：检测所述沉铁单元内铁离子含量并根据铁离子含量控制是否供入元明粉；其中，当铁离子含量大于1g/L时，控制供入元明粉，当铁离子含量低于1g/L时，控制停止供入元明粉。Optionally, the step S200 also includes: detecting the iron ion content in the iron precipitation unit and controlling whether to supply alum according to the iron ion content; wherein, when the iron ion content is greater than 1g/L, the supply of alum is controlled, and when the iron ion content is lower than 1g/L, the supply of alum is controlled to be stopped.

可选地，所述步骤S300包括：Optionally, the step S300 includes:

将沉降单元处理后的浆料输入第一中和单元的第一反应罐，向所述第一反应罐内加入铁铝渣和镍钴渣；The slurry treated by the sedimentation unit is input into the first reaction tank of the first neutralization unit, and iron-aluminum slag and nickel-cobalt slag are added into the first reaction tank;

将第一反应罐内中和反应后的浆料输入第一中和单元的第二反应罐内，检测第二反应罐内的pH值并根据pH值控制第一反应罐内铁铝渣和镍钴渣的加入量。The slurry after the neutralization reaction in the first reaction tank is input into the second reaction tank of the first neutralization unit, the pH value in the second reaction tank is detected and the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled according to the pH value.

可选地，所述检测第二反应罐内的pH值并根据pH值控制第一反应罐内铁铝渣和镍钴渣的加入量包括：Optionally, the step of detecting the pH value in the second reaction tank and controlling the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank according to the pH value comprises:

若检测第二反应罐内的pH值高于第一阈值范围，则控制增加第一反应罐内铁铝渣和镍钴渣的加入量；If the pH value in the second reaction tank is detected to be higher than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to increase;

若检测第二反应罐内的pH值低于第一阈值范围，则控制降低第一反应罐内铁铝渣和镍钴渣的加入量。If the pH value in the second reaction tank is detected to be lower than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to be reduced.

可选地，所述第一阈值范围为0.9～1.1。Optionally, the first threshold ranges from 0.9 to 1.1.

可选地，所述步骤S400包括：Optionally, the step S400 includes:

将第一中和单元处理后的浆料输入第二中和单元的第三反应罐内，向所述第三反应罐内加入中和剂； The slurry treated by the first neutralization unit is input into the third reaction tank of the second neutralization unit, and a neutralizing agent is added into the third reaction tank;

将第三反应罐内中和反应后的浆料输入第二中和单元的第四反应罐内，向所述第四反应罐内加入中和剂；The slurry after the neutralization reaction in the third reaction tank is input into the fourth reaction tank of the second neutralization unit, and a neutralizing agent is added into the fourth reaction tank;

将第四反应罐内中和反应后的浆料输入第二中和单元的第五反应罐内，检测第五反应罐内的pH值并根据pH值控制第三反应罐和第四反应罐内中和剂的加入量。The slurry after the neutralization reaction in the fourth reaction tank is input into the fifth reaction tank of the second neutralization unit, the pH value in the fifth reaction tank is detected, and the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled according to the pH value.

可选地，所述检测第五反应罐内的pH值并根据pH值控制第三反应罐和第四反应罐内中和剂的加入量包括：Optionally, the step of detecting the pH value in the fifth reaction tank and controlling the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank according to the pH value comprises:

若检测第五反应罐内的pH值高于第二阈值范围，则控制增加第三反应罐和第四反应罐内中和剂的加入量；If the pH value in the fifth reaction tank is higher than the second threshold value, the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to increase;

若检测第五反应罐内的pH值低于第二阈值范围，则控制降低第三反应罐和第四反应罐内中和剂的加入量。If the pH value in the fifth reaction tank is detected to be lower than the second threshold range, the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to be reduced.

可选地，所述第二阈值范围为1.5～2。Optionally, the second threshold range is 1.5-2.

与现有技术相比，本发明提供的红土镍矿湿法冶金预中和方法的有益效果包括：通过预中和的以上处理方式，可使得浆料的除铁过程、铁铝渣和镍钴渣的溶解中和过程、以及中和剂的中和过程可独立进行，进而可根据沉铁单元、第一中和单元和第二中和单元内部浆料与添加的元明粉、铁铝渣和镍钴渣、中和剂的反应情况，并结合第一中和单元和第二中和单元内的pH值，精确控制元明粉、铁铝渣和镍钴渣、中和剂，使得添加的元明粉、铁铝渣和镍钴渣、中和剂的量处于合适的范围内，进而能够将浆料中的铁离子和镍离子的量得到精确控制，提升红土镍矿湿法冶金的经济效益。Compared with the prior art, the beneficial effects of the laterite nickel ore hydrometallurgical pre-neutralization method provided by the present invention include: through the above treatment method of pre-neutralization, the iron removal process of the slurry, the dissolution and neutralization process of the iron-aluminum slag and the nickel-cobalt slag, and the neutralization process of the neutralizer can be carried out independently, and then the alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer can be accurately controlled according to the reaction of the slurry inside the iron precipitation unit, the first neutralization unit, and the second neutralization unit with the added alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer, and combined with the pH value in the first neutralization unit and the second neutralization unit, so that the amount of the added alum, iron-aluminum slag, nickel-cobalt slag, and neutralizer is within a suitable range, and then the amount of iron ions and nickel ions in the slurry can be accurately controlled, thereby improving the economic benefits of the laterite nickel ore hydrometallurgy.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1为本发明实施例提供的红土镍矿湿法冶金预中和系统的结构示意图。FIG1 is a schematic structural diagram of a laterite nickel ore hydrometallurgical pre-neutralization system provided in an embodiment of the present invention.

图2为本发明实施例提供的红土镍矿湿法冶金预中和方法的流程图。FIG2 is a flow chart of a laterite nickel ore hydrometallurgical pre-neutralization method provided in an embodiment of the present invention.

其中，图中各附图标记：
10—沉铁单元         11—第六反应罐      20—第一中和单元
21—第一反应罐       22—第二反应罐      30—第二中和单元
31—第三反应罐       32—第四反应罐      33—第五反应罐
40—首端浓密机       50—尾端浓密机。Among them, the reference numerals in the figure are:
10—Iron precipitation unit 11—Sixth reaction tank 20—First neutralization unit
21—first reaction tank 22—second reaction tank 30—second neutralization unit
31—third reaction tank 32—fourth reaction tank 33—fifth reaction tank
40—First end thickener 50—Tail end thickener

具体实施方式DETAILED DESCRIPTION

为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

本发明的实施例提供了一种红土镍矿湿法冶金预中和系统，预中和系统用于红土镍矿湿法冶金的预中和处理工艺中，包括沉铁单元10、第一中和单元20、第二中和单元20和控制单元(图中未标识)，第一中和单元20与沉铁单元10连接；第二中和单元30与第一中和单元20连接；控制单元与第一中和单元20和第二中和单元30连接，用于检测第一中和单元和第二中和单元内的pH值，并根据其检测的pH值分别控制第一中和单元内铁铝渣、镍钴渣的加入量及第二中和单元内中和剂的加入量。An embodiment of the present invention provides a laterite nickel ore hydrometallurgical pre-neutralization system, which is used in the pre-neutralization treatment process of laterite nickel ore hydrometallurgy, and includes an iron precipitation unit 10, a first neutralization unit 20, a second neutralization unit 20 and a control unit (not shown in the figure), wherein the first neutralization unit 20 is connected to the iron precipitation unit 10; the second neutralization unit 30 is connected to the first neutralization unit 20; the control unit is connected to the first neutralization unit 20 and the second neutralization unit 30, and is used to detect the pH value in the first neutralization unit and the second neutralization unit, and control the amount of iron-aluminum slag and nickel-cobalt slag added in the first neutralization unit and the amount of neutralizer added in the second neutralization unit according to the detected pH value.

具体地，通过设置沉铁单元10、第一中和单元20和第二中和单元30，沉铁单元10承接高压浸出浆料，通过向沉铁单元10供入元明粉，降低承接的浆料中的铁离子含量，第一中和单元20与沉铁单元10连接，可承接供入的元明粉后的浆料，并可通过供入铁铝渣和镍钴渣，使铁铝渣和镍钴渣与浆料中的酸反应，中和浆料中的酸，同时溶解铁铝渣和镍钴渣中的铁和镍；第二中和单元30与第一中和单元20连接，第一中和单元20可承接供入铁铝渣和镍钴渣后的浆料，并用于通过供入中和剂，中和浆料中的酸，控制单元通过检测第一中和单元20和第二中和单元30内的pH值，可实现对第一中和单元20铁铝渣和镍钴渣，以及对第二中和单元30中和剂的供入量的精确控制，最终实现对浆料中的PH值的精确控制；Specifically, by setting the iron precipitation unit 10, the first neutralization unit 20 and the second neutralization unit 30, the iron precipitation unit 10 receives the high-pressure leaching slurry, and by supplying sodium sulfate to the iron precipitation unit 10, the iron ion content in the received slurry is reduced. The first neutralization unit 20 is connected to the iron precipitation unit 10, and can receive the slurry after the sodium sulfate is supplied, and can supply iron-aluminum slag and nickel-cobalt slag to make the iron-aluminum slag and nickel-cobalt slag react with the acid in the slurry, neutralize the acid in the slurry, and dissolve the iron-aluminum slag and nickel-cobalt slag at the same time. The second neutralization unit 30 is connected to the first neutralization unit 20, and the first neutralization unit 20 can receive the slurry after the iron-aluminum slag and the nickel-cobalt slag are fed, and is used to neutralize the acid in the slurry by feeding the neutralizer. The control unit can accurately control the feeding amount of the iron-aluminum slag and the nickel-cobalt slag in the first neutralization unit 20 and the neutralizer in the second neutralization unit 30 by detecting the pH value in the first neutralization unit 20 and the second neutralization unit 30, and finally realize the accurate control of the pH value in the slurry;

通过沉铁单元10、第一中和单元20和第二中和单元30的单独设置，可根据沉铁单元10、第一中和单元20和第二中和单元30内部浆料与添加的元明粉、铁铝渣和镍钴渣、中和剂的反应情况，同时，通过控制单元对元明粉、铁铝渣和镍钴渣、中和剂的精确控制，使得添加的元明粉、铁铝渣和镍钴渣、中和剂的量处于合适的范围内，进而能够将浆料中的铁离子和镍离子的量得到精确控制，提升红土镍矿湿法冶金的经济效益。Through the separate arrangement of the iron settling unit 10, the first neutralization unit 20 and the second neutralization unit 30, according to the reaction of the slurry inside the iron settling unit 10, the first neutralization unit 20 and the second neutralization unit 30 with the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer, and at the same time, through the precise control of the alum, iron-aluminum slag, nickel-cobalt slag and neutralizer by the control unit, the amount of the added alum, iron-aluminum slag, nickel-cobalt slag and neutralizer is within a suitable range, thereby being able to accurately control the amount of iron ions and nickel ions in the slurry, thereby improving the economic benefits of laterite nickel ore hydrometallurgy.

本实施例中，红土镍矿湿法冶金主要包括选矿-高压浸出-预中和-CCD 逆流洗涤-1段沉铁铝-2段沉铁铝-1段沉镍钴-2段沉镍钴，预中和方法主要用于红土镍矿湿法冶金的高压浸出后的预中和、以及CCD逆流洗涤工艺流程当中，铁铝渣和镍钴渣为2段沉铁铝和2段沉镍钴后产生的2段铁铝渣和2段沉镍钴，矿料通过高压浸出形成浆料后，形成温度在95℃左右的浆料，浆料中含有铁离子和残酸，浆料的铁离子含量在5g/L左右，残酸含量为45-50g/L。In this embodiment, the hydrometallurgy of laterite nickel ore mainly includes ore dressing-high pressure leaching-pre-neutralization-CCD Countercurrent washing - 1 stage iron-aluminum precipitation - 2 stages iron-aluminum precipitation - 1 stage nickel-cobalt precipitation - 2 stages nickel-cobalt precipitation. The pre-neutralization method is mainly used for the pre-neutralization after high-pressure leaching of laterite nickel ore hydrometallurgy, and in the CCD countercurrent washing process. The iron-aluminum slag and nickel-cobalt slag are 2 stages of iron-aluminum slag and 2 stages of nickel-cobalt precipitation produced after 2 stages of iron-aluminum precipitation and 2 stages of nickel-cobalt precipitation. After the ore is formed into a slurry through high-pressure leaching, a slurry with a temperature of about 95°C is formed. The slurry contains iron ions and residual acid. The iron ion content of the slurry is about 5g/L, and the residual acid content is 45-50g/L.

可以理解的，沉铁单元10、第一中和单元20和第二中和单元30可以为一段或多段槽体组合而成。It can be understood that the iron sinking unit 10, the first neutralization unit 20 and the second neutralization unit 30 can be composed of one or more sections of tank bodies.

本实施例中，沉铁单元10中，控制单元通过控制加入浆料中元明粉的量，使反应后的浆料的铁离子含量小于1g/L。具体地，通过将反应后的浆料的铁离子控制在小于1g/L，既可有效去除浆料中的铁离子，还可有效控制元明粉加入的量，避免元明粉过量。In this embodiment, in the iron precipitation unit 10, the control unit controls the amount of sodium sulfate added to the slurry so that the iron ion content of the slurry after the reaction is less than 1g/L. Specifically, by controlling the iron ions of the slurry after the reaction to be less than 1g/L, the iron ions in the slurry can be effectively removed, and the amount of sodium sulfate added can be effectively controlled to avoid excessive sodium sulfate.

本实施例中，如图1所示，第一中和单元20包括进料设备(图中未标识)、第一反应罐21和第二反应罐22，第一反应罐21与沉铁单元10的出料端连接，进料设备与第一反应罐21连接，用于向第一反应罐21供入铁铝渣和镍钴渣，第二反应罐22的进料端与第一反应罐21连接、第二反应罐的出料端与第二中和单元30连接。In this embodiment, as shown in Figure 1, the first neutralization unit 20 includes a feeding device (not marked in the figure), a first reaction tank 21 and a second reaction tank 22. The first reaction tank 21 is connected to the discharge end of the iron precipitation unit 10, and the feeding device is connected to the first reaction tank 21 for supplying iron-aluminum slag and nickel-cobalt slag to the first reaction tank 21. The feeding end of the second reaction tank 22 is connected to the first reaction tank 21, and the discharge end of the second reaction tank is connected to the second neutralization unit 30.

具体地，进料设备可为第一反应罐21提供铁铝渣和镍钴渣，第一反应罐21可供铁铝渣和镍钴渣与浆料反应，将铁铝渣和镍钴渣的铁铝镍钴等金属氧化物溶解，形成相应的离子结构，第二反应罐22可承接反应后的浆料，通过第一反应罐21的充分反应和静置，进而可得到反应后较为纯净的浆料。Specifically, the feeding equipment can provide iron-aluminum slag and nickel-cobalt slag to the first reaction tank 21. The first reaction tank 21 can allow the iron-aluminum slag and nickel-cobalt slag to react with the slurry, dissolve the metal oxides such as iron, aluminum, nickel and cobalt in the iron-aluminum slag and nickel-cobalt slag, and form corresponding ion structures. The second reaction tank 22 can receive the slurry after the reaction. Through the sufficient reaction and standing of the first reaction tank 21, a relatively pure slurry after the reaction can be obtained.

本实施例中，进一步地，通过控制通入铁铝渣和镍钴渣的量，使浆料的pH值在0.9～1.1之间。具体地，通过将浆料的pH值控制在0.9～1.1之间，可实现浆料对铁铝渣和镍钴渣的最大效率的溶解，也即，若浆料的pH值高于1.1，则说明铁铝渣和镍钴渣的供入量过多，导致多余的铁铝渣和镍钴渣无法在该酸性条件下有效溶解，若pH值低于0.9，则说明铁铝渣和镍钴渣的供入量不足，浆料的酸度还可以溶解更过的铁铝渣和镍钴渣，进而使得浆料的酸度无法得到充分的利用，且难以实现铁铝渣和镍钴渣对浆料的酸度的充分中和。In this embodiment, further, by controlling the amount of iron-aluminum slag and nickel-cobalt slag introduced, the pH value of the slurry is made between 0.9 and 1.1. Specifically, by controlling the pH value of the slurry between 0.9 and 1.1, the slurry can dissolve the iron-aluminum slag and nickel-cobalt slag with the maximum efficiency, that is, if the pH value of the slurry is higher than 1.1, it means that the amount of iron-aluminum slag and nickel-cobalt slag fed is too much, resulting in the inability of the excess iron-aluminum slag and nickel-cobalt slag to be effectively dissolved under the acidic conditions, and if the pH value is lower than 0.9, it means that the amount of iron-aluminum slag and nickel-cobalt slag fed is insufficient, and the acidity of the slurry can still dissolve more iron-aluminum slag and nickel-cobalt slag, thereby making it impossible to fully utilize the acidity of the slurry, and it is difficult to fully neutralize the acidity of the slurry by the iron-aluminum slag and nickel-cobalt slag.

本实施例中，控制单元包括第一控制模块和pH监测仪，pH监测仪与第 二反应罐22连接，用于监测第二反应罐22内浆料的pH值，第一控制模块与pH监测仪和进料设备连接，用于通过pH监测仪检测的pH值，控制进料设备供入第一反应罐21的铁铝渣和镍钴渣的量。In this embodiment, the control unit includes a first control module and a pH monitor. The second reaction tank 22 is connected to monitor the pH value of the slurry in the second reaction tank 22, and the first control module is connected to the pH monitor and the feeding equipment to control the amount of iron-aluminum slag and nickel-cobalt slag supplied to the first reaction tank 21 by the feeding equipment according to the pH value detected by the pH monitor.

具体地，pH监测仪通过监测第二反应罐22内浆料的pH值，可有效获取与铁铝渣和镍钴渣反应后的浆料的pH，pH监测仪通过对第二反应罐22内浆料的pH值的检测，以及第一控制模块对进料设备的控制，可实现铁铝渣和镍钴渣添加量的自动控制，减轻人力的同时，能有效精确控制与铁铝渣和镍钴渣反应后的浆料的pH，以及所添加的铁铝渣和镍钴渣的量。Specifically, the pH monitor can effectively obtain the pH of the slurry after the reaction with the iron-aluminum slag and the nickel-cobalt slag by monitoring the pH value of the slurry in the second reaction tank 22. The pH monitor can automatically control the amount of iron-aluminum slag and nickel-cobalt slag added by detecting the pH value of the slurry in the second reaction tank 22 and controlling the feeding equipment by the first control module. While reducing manpower, it can effectively and accurately control the pH of the slurry after the reaction with the iron-aluminum slag and the nickel-cobalt slag, as well as the amount of iron-aluminum slag and nickel-cobalt slag added.

本实施例中，如图1所示，第二中和单元30包括进料泵(图中未标识)和依序连接的第三反应罐31、第四反应罐32和第五反应罐33，第三反应罐31与第一中和单元20的出料端连接，进料泵与第三反应罐31和第四反应罐32连接，用于向第三反应罐31和第四反应罐32通入中和剂。In this embodiment, as shown in Figure 1, the second neutralization unit 30 includes a feed pump (not marked in the figure) and a third reaction tank 31, a fourth reaction tank 32 and a fifth reaction tank 33 connected in sequence, the third reaction tank 31 is connected to the discharge end of the first neutralization unit 20, and the feed pump is connected to the third reaction tank 31 and the fourth reaction tank 32, and is used to pass the neutralizer into the third reaction tank 31 and the fourth reaction tank 32.

具体地，进料泵可为第三反应罐31和第四反应罐32提供中和剂，第三反应罐31和第四反应罐32可供中和剂与浆料反应，将中和剂与浆料反应后，对浆料进行中和，增大浆料的pH，第二反应罐22可承接反应后的浆料，通过第一反应罐21的充分反应和静置，进而可得到反应后较为纯净的浆料。Specifically, the feed pump can provide a neutralizer to the third reaction tank 31 and the fourth reaction tank 32. The third reaction tank 31 and the fourth reaction tank 32 can provide the neutralizer to react with the slurry. After the neutralizer reacts with the slurry, the slurry is neutralized to increase the pH of the slurry. The second reaction tank 22 can receive the slurry after the reaction. Through the sufficient reaction and standing of the first reaction tank 21, a relatively pure slurry after the reaction can be obtained.

本实施例中，进一步地，添加中和剂后的浆料的pH值在1.5～2.0之间。In this embodiment, further, the pH value of the slurry after adding the neutralizer is between 1.5 and 2.0.

本实施例中，红土镍矿湿法冶金预中和系统还包括第二控制模块(图中未标识)，控制单元还包括第二控制模块和pH检测仪，pH检测仪与第五反应罐33连接，用于监测第五反应罐33内浆料的pH值，第二控制模块与pH检测仪和进料泵连接，用于通过pH检测仪检测的pH值，控制进料泵供入第三反应罐31和第四反应罐32的中和剂的量。In this embodiment, the laterite nickel ore hydrometallurgical pre-neutralization system also includes a second control module (not marked in the figure), the control unit also includes a second control module and a pH detector, the pH detector is connected to the fifth reaction tank 33, and is used to monitor the pH value of the slurry in the fifth reaction tank 33. The second control module is connected to the pH detector and the feed pump, and is used to control the amount of neutralizer supplied to the third reaction tank 31 and the fourth reaction tank 32 by the feed pump according to the pH value detected by the pH detector.

具体地，pH检测仪通过监测第五反应罐33内浆料的pH值，可有效获取与中和剂反应后的浆料的pH，pH检测仪通过对第五反应罐33内浆料的pH值的检测，以及第二控制模块对进料设备的控制，可实现中和剂添加量的自动控制，减轻人力的同时，能有效精确控制与中和剂反应后的浆料的pH，以及所添加的中和剂的量。Specifically, the pH detector can effectively obtain the pH of the slurry after reacting with the neutralizer by monitoring the pH value of the slurry in the fifth reaction tank 33. The pH detector can realize automatic control of the amount of neutralizer added by detecting the pH value of the slurry in the fifth reaction tank 33 and controlling the feeding equipment by the second control module, thereby reducing manpower and effectively and accurately controlling the pH of the slurry after reacting with the neutralizer and the amount of neutralizer added.

本实施例中，如图1所示，沉铁单元10包括第六反应罐11，第六反应罐11承接高压浸出浆料，并供元明粉和高压浸出浆料反应。 In this embodiment, as shown in FIG. 1 , the iron precipitation unit 10 includes a sixth reaction tank 11 , which receives the high-pressure leaching slurry and provides for the reaction of sodium sulphate with the high-pressure leaching slurry.

本实施例中，控制单元还用于检测第六反应罐11内铁离子含量，并根据铁离子含量控制加料设备是否供入元明粉。具体地，控制单元通过对铁离子含量的检测，可实现对元明粉加入量的精确控制。In this embodiment, the control unit is also used to detect the iron ion content in the sixth reaction tank 11, and control whether the feeding device feeds sodium sulfate according to the iron ion content. Specifically, the control unit can accurately control the amount of sodium sulfate added by detecting the iron ion content.

本实施例中，通过控制器、供料设备、检测模块、pH监测仪、进料设备、pH检测仪和进料泵的设置，可实现对整个预中和工艺的自动化控制，进而有效减轻预中和过程消耗的人力。In this embodiment, through the setting of the controller, feeding equipment, detection module, pH monitor, feeding equipment, pH detector and feed pump, the entire pre-neutralization process can be automatically controlled, thereby effectively reducing the manpower consumed in the pre-neutralization process.

本实施例中，如图1所示，红土镍矿湿法冶金预中和系统还包括若干浓密机，各浓密机依序排列，首端的浓密机与第二中和单元30连接，尾端浓密机50用于通过控制进水量，减小尾端浓密机50外排的底流的液相中铁离子含量以及固相中镍的含量。具体地，通过控制尾端浓密机50的进水量，可使得尾端浓密机50外排的底流的液相占比在50～60％之间，通过检测底流的液相中的铁离子以及对固相中的镍的检测，可相对准确的反应尾端浓密机50内浆料中铁离子和镍离子的含量，进而可有效反应铁、镍、钴从一个浓密机的溢出量。In this embodiment, as shown in FIG1 , the laterite nickel ore hydrometallurgical pre-neutralization system further includes a plurality of thickeners, each of which is arranged in sequence, and the thickener at the head end is connected to the second neutralization unit 30, and the tail end thickener 50 is used to reduce the iron ion content in the liquid phase of the bottom flow discharged from the tail end thickener 50 and the nickel content in the solid phase by controlling the water inflow. Specifically, by controlling the water inflow of the tail end thickener 50, the liquid phase of the bottom flow discharged from the tail end thickener 50 can be made to account for 50-60%, and by detecting the iron ions in the liquid phase of the bottom flow and the nickel in the solid phase, the content of iron ions and nickel ions in the slurry in the tail end thickener 50 can be relatively accurately reflected, and then the overflow of iron, nickel and cobalt from one thickener can be effectively reflected.

本实施例中，进一步地，如图1所示，浓密机的数量为6个，首端浓密机40与第五反应罐33连接，各浓密机外排的底流通入下一浓密机，直至进入尾端浓密机50，从尾端浓密机50排出；清水通过加入尾端浓密机50，将从尾端浓密机50依序溢流，直至进入首端浓密机40，最后由首端浓密机40进入沉铁车间。In this embodiment, further, as shown in Figure 1, the number of thickeners is 6, the head-end thickener 40 is connected to the fifth reaction tank 33, and the bottom flow discharged from each thickener flows into the next thickener until it enters the tail-end thickener 50 and is discharged from the tail-end thickener 50; clean water is added to the tail-end thickener 50, and will overflow from the tail-end thickener 50 in sequence until it enters the head-end thickener 40, and finally enters the iron precipitation workshop from the head-end thickener 40.

本发明的实施例还提供一种红土镍矿湿法冶金预中和方法，通过所述的红土镍矿湿法冶金预中和系统执行，如图2所示，包括以下步骤：An embodiment of the present invention further provides a laterite nickel ore hydrometallurgical pre-neutralization method, which is performed by the laterite nickel ore hydrometallurgical pre-neutralization system, as shown in FIG2 , and includes the following steps:

S100：将高压浸出浆料通入沉铁单元10；S100: passing the high-pressure leaching slurry into the iron precipitation unit 10;

S200：向所述沉铁单元10加入元明粉，降低浆料中铁离子含量；S200: adding sodium sulfate to the iron precipitation unit 10 to reduce the iron ion content in the slurry;

S300：将沉降单元10处理后的浆料输入第一中和单元20，向所述第一中和单元20加入铁铝渣和镍钴渣，检测第一中和单元20内的pH值并根据pH值控制铁铝渣和镍钴渣的加入量；S300: inputting the slurry treated by the sedimentation unit 10 into the first neutralization unit 20, adding iron-aluminum slag and nickel-cobalt slag to the first neutralization unit 20, detecting the pH value in the first neutralization unit 20 and controlling the amount of iron-aluminum slag and nickel-cobalt slag added according to the pH value;

S400：将第一中和单元20处理后的浆料输入第二中和单元30，向所述第二中和单元30加入中和剂，检测第二中和单元30内的pH值并根据pH值控制中和剂的加入量。 S400: inputting the slurry treated by the first neutralization unit 20 into the second neutralization unit 30, adding a neutralizer to the second neutralization unit 30, detecting the pH value in the second neutralization unit 30 and controlling the amount of the neutralizer added according to the pH value.

具体地，通过预中和的以上处理方式，可使得浆料的除铁过程、铁铝渣和镍钴渣的溶解中和过程、以及中和剂的中和过程可独立进行，进而可根据沉铁单元10、第一中和单元20和第二中和单元30内部浆料与添加的元明粉、铁铝渣和镍钴渣、中和剂的反应情况，并结合第一中和单元20和第二中和单元30内的pH值，精确控制元明粉、铁铝渣和镍钴渣、中和剂，使得添加的元明粉、铁铝渣和镍钴渣、中和剂的量处于合适的范围内，进而能够将浆料中的铁离子和镍离子的量得到精确控制，提升红土镍矿湿法冶金的经济效益。Specifically, through the above treatment method of pre-neutralization, the iron removal process of the slurry, the dissolution and neutralization process of the iron-aluminum slag and the nickel-cobalt slag, and the neutralization process of the neutralizer can be carried out independently, and then according to the reaction of the slurry inside the iron precipitation unit 10, the first neutralization unit 20 and the second neutralization unit 30 with the added alum, iron-aluminum slag and nickel-cobalt slag, and the neutralizer, and combined with the pH value in the first neutralization unit 20 and the second neutralization unit 30, the alum, iron-aluminum slag and nickel-cobalt slag, and the neutralizer can be accurately controlled, so that the amount of the added alum, iron-aluminum slag and nickel-cobalt slag, and the neutralizer is within an appropriate range, and then the amount of iron ions and nickel ions in the slurry can be accurately controlled, thereby improving the economic benefits of laterite nickel ore hydrometallurgy.

本实施例中，在步骤S300中，通过pH监测仪在线监测加入铁铝渣和镍钴渣后浆料的pH值，第一控制模块通过pH监测仪监测的pH值控制进料设备减少或增加通入铁铝渣和镍钴渣的量，以控制pH监测仪监测的pH值在第一阈值范围内，其中，第一阈值范围在0.9～1.1之间。具体地，通过pH监测仪对加入铁铝渣和镍钴渣后浆料的pH值的监测，以及第一控制模块对进料设备通入铁铝渣和镍钴渣的量的控制，可实现对铁铝渣和镍钴渣高效投料过程的自动控制，进而有效减轻预中和工艺的强度。In this embodiment, in step S300, the pH value of the slurry after adding the iron-aluminum slag and the nickel-cobalt slag is monitored online by the pH monitor, and the first control module controls the feeding device to reduce or increase the amount of the iron-aluminum slag and the nickel-cobalt slag through the pH value monitored by the pH monitor, so as to control the pH value monitored by the pH monitor to be within the first threshold range, wherein the first threshold range is between 0.9 and 1.1. Specifically, by monitoring the pH value of the slurry after adding the iron-aluminum slag and the nickel-cobalt slag through the pH monitor, and controlling the amount of the iron-aluminum slag and the nickel-cobalt slag passed into the feeding device by the first control module, the automatic control of the efficient feeding process of the iron-aluminum slag and the nickel-cobalt slag can be realized, thereby effectively reducing the intensity of the pre-neutralization process.

本实施例中，进一步地，浆料在第六反应罐11反应后再通入第一反应罐21，第一反应罐21用于供铁铝渣和镍钴渣于浆料的反应，第二反应罐22承接第一反应罐21内与铁铝渣和镍钴渣反应后的浆料，pH监测仪与第二反应罐22，对与铁铝渣和镍钴渣反应后的浆料的pH值实时监测；In this embodiment, further, after the slurry reacts in the sixth reaction tank 11, it is introduced into the first reaction tank 21. The first reaction tank 21 is used to provide the iron-aluminum slag and the nickel-cobalt slag for the reaction of the slurry. The second reaction tank 22 receives the slurry in the first reaction tank 21 after the reaction with the iron-aluminum slag and the nickel-cobalt slag. The pH monitor and the second reaction tank 22 monitor the pH value of the slurry after the reaction with the iron-aluminum slag and the nickel-cobalt slag in real time.

若检测第二反应罐内的pH值高于第一阈值范围，则控制增加第一反应罐内铁铝渣和镍钴渣的加入量；If the pH value in the second reaction tank is detected to be higher than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to increase;

若检测第二反应罐内的pH值低于第一阈值范围，则控制降低第一反应罐内铁铝渣和镍钴渣的加入量。If the pH value in the second reaction tank is detected to be lower than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to be reduced.

也即，当pH监测仪监测的pH值小于0.9时，第一控制模块控制进料设备增加铁铝渣和镍钴渣向第二反应罐22投入的量，当pH监测仪监测的pH值大于1.1时，第一控制模块控制进料设备减少铁铝渣和镍钴渣向第二反应罐22投入的量。That is, when the pH value monitored by the pH monitor is less than 0.9, the first control module controls the feeding equipment to increase the amount of iron-aluminum slag and nickel-cobalt slag fed into the second reaction tank 22; when the pH value monitored by the pH monitor is greater than 1.1, the first control module controls the feeding equipment to reduce the amount of iron-aluminum slag and nickel-cobalt slag fed into the second reaction tank 22.

本实施例中，在步骤S500中，pH检测仪检测加入中和剂后浆料的pH值，第二控制模块通过pH检测仪检测的pH值控制进料泵减少或增加加入中和剂的量，以控制pH检测仪检测的pH值在第二阈值范围，其中，第二 阈值范围在1.5～2.0之间。具体地，通过pH检测仪对加入中和剂后浆料的pH值的监测，以及第二控制模块对进料泵通入中和剂的量的控制，可实现对浆料中和过程的自动控制，进而有效减轻预中和工艺的强度。In this embodiment, in step S500, the pH detector detects the pH value of the slurry after the neutralizer is added, and the second control module controls the feed pump to reduce or increase the amount of the neutralizer added according to the pH value detected by the pH detector, so as to control the pH value detected by the pH detector to be within the second threshold range, wherein the second The threshold value range is between 1.5 and 2.0. Specifically, by monitoring the pH value of the slurry after adding the neutralizer with the pH detector and controlling the amount of the neutralizer introduced by the feed pump with the second control module, the slurry neutralization process can be automatically controlled, thereby effectively reducing the intensity of the pre-neutralization process.

本实施例中，进一步地，浆料在第二反应罐22监测后依序进入第三反应罐31中、第四反应罐32和五反应罐中，中和剂加入第三反应罐31中和第四反应罐32内，pH检测仪检测第四反应罐32和五反应罐的浆料的PH值；In this embodiment, further, after being monitored in the second reaction tank 22, the slurry sequentially enters the third reaction tank 31, the fourth reaction tank 32 and the fifth reaction tank, the neutralizer is added to the third reaction tank 31 and the fourth reaction tank 32, and the pH detector detects the pH value of the slurry in the fourth reaction tank 32 and the fifth reaction tank;

若pH检测仪检测第五反应罐内的pH值高于第二阈值范围，则控制增加第三反应罐和第四反应罐内中和剂的加入量；If the pH value in the fifth reaction tank detected by the pH detector is higher than the second threshold range, the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to increase;

若pH检测仪检测第五反应罐内的pH值低于第二阈值范围，则控制降低第三反应罐和第四反应罐内中和剂的加入量。If the pH value in the fifth reaction tank detected by the pH detector is lower than the second threshold range, the amount of the neutralizer added to the third reaction tank and the fourth reaction tank is controlled to be reduced.

也即，当pH检测仪监测的pH值小于1.5时，第二控制模块控制进料泵增加中和剂向第三反应罐31中和第四反应罐32投入的量，当pH检测仪监测的pH值大于2.0时，第二控制模块控制进料泵减少中和剂向第三反应罐31中和第四反应罐32投入的量。That is, when the pH value monitored by the pH detector is less than 1.5, the second control module controls the feed pump to increase the amount of neutralizer input into the third reaction tank 31 and the fourth reaction tank 32; when the pH value monitored by the pH detector is greater than 2.0, the second control module controls the feed pump to reduce the amount of neutralizer input into the third reaction tank 31 and the fourth reaction tank 32.

本实施例中，在步骤S200中，检测模块检测加入元明粉后浆料内铁离子含量，并根据铁离子含量控制是否供入元明粉；检测模块检测出铁离子含量大于1g/L时，控制单元控制供料设备向浆料内供入元明粉，检测模块检测出铁离子含量小于1g/L时，控制单元控制供料设备停止向浆料内供入元明粉。具体地，通过检测模块对铁离子含量的监测，以及控制单元对供料设备通入元明粉的量的控制，可实现对浆料中铁离子处理过程的自动控制，进而有效减轻预中和工艺的强度。In this embodiment, in step S200, the detection module detects the iron ion content in the slurry after adding sodium sulfate, and controls whether to feed sodium sulfate according to the iron ion content; when the detection module detects that the iron ion content is greater than 1g/L, the control unit controls the feeding device to feed sodium sulfate into the slurry, and when the detection module detects that the iron ion content is less than 1g/L, the control unit controls the feeding device to stop feeding sodium sulfate into the slurry. Specifically, by monitoring the iron ion content by the detection module and controlling the amount of sodium sulfate introduced into the feeding device by the control unit, automatic control of the iron ion treatment process in the slurry can be achieved, thereby effectively reducing the intensity of the pre-neutralization process.

本实施例中，进一步地，检测模块和供料设备与第六反应罐11连接，当检测模块检测的铁离子含量小于1g/L时，控制单元控制供料设备减小元明粉向第六反应罐11投入的量，当检测模块检测的铁离子含量大于1g/L时，控制单元控制供料设备增大元明粉向第六反应罐11投入的量。In this embodiment, further, the detection module and the feeding equipment are connected to the sixth reaction tank 11. When the iron ion content detected by the detection module is less than 1g/L, the control unit controls the feeding equipment to reduce the amount of alum fed to the sixth reaction tank 11. When the iron ion content detected by the detection module is greater than 1g/L, the control unit controls the feeding equipment to increase the amount of alum fed to the sixth reaction tank 11.

本实施例中，检测模块可以为3S-CL-Fe铁离子在线分析仪，通过在线分析仪在线采样分析检测第六反应罐11中铁离子的含量，或者通过显色反应，1,10-磷二氮嗪与采样的溶液中铁离子发生显示反应，变成橙色溶液；或者以定量分析吸光度测定铁离子含量；或者通过在线分析仪、显色反应和吸光度测定的结合。 In this embodiment, the detection module can be a 3S-CL-Fe iron ion online analyzer, which detects the content of iron ions in the sixth reaction tank 11 through online sampling and analysis by the online analyzer, or through a color reaction, 1,10-phosphdiazoxide reacts with the iron ions in the sampled solution to turn it into an orange solution; or the iron ion content is determined by quantitative analysis of absorbance; or through a combination of an online analyzer, a color reaction and absorbance determination.

本实施例中，在步骤S400中，尾端浓密机50外排的底流的液相中铁离子含量小于0.08g/L，固相中镍的质量分数小于0.06％。具体地，通过将浓密机外排的底流的液相铁离子含量小于0.08g/L，固相中镍的质量分数小于0.06％，可将外排的底流的铁和镍的含量控制在较低的水平，进而使得从首端浓密机40通出的浆液的铁离子和镍离子的含量控制在较高的水平。In this embodiment, in step S400, the iron ion content in the liquid phase of the underflow discharged from the rear end thickener 50 is less than 0.08 g/L, and the mass fraction of nickel in the solid phase is less than 0.06%. Specifically, by making the iron ion content in the liquid phase of the underflow discharged from the thickener less than 0.08 g/L, and the mass fraction of nickel in the solid phase less than 0.06%, the iron and nickel contents of the underflow discharged can be controlled at a lower level, thereby making the iron ion and nickel ion contents of the slurry discharged from the head end thickener 40 controlled at a higher level.

本实施例中，在步骤S500中，中和剂为石灰石、石灰乳和氢氧化钠中的一种或多种。具体地，通过设置石灰石、石灰乳和氢氧化钠中的一种或多种的结合，可实现对浆液的高效中和。In this embodiment, in step S500, the neutralizing agent is one or more of limestone, lime milk and sodium hydroxide. Specifically, by providing a combination of one or more of limestone, lime milk and sodium hydroxide, efficient neutralization of the slurry can be achieved.

以上所述本发明的具体实施方式，并不构成对本发明保护范围的限定。任何根据本发明的技术构思所做出的各种其他相应的改变与变形，均应包含在本发明权利要求的保护范围内。 The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims (16)

一种红土镍矿湿法冶金预中和系统，其特征在于，包括：A laterite nickel ore hydrometallurgical pre-neutralization system, characterized by comprising: 沉铁单元；Iron sinking unit; 第一中和单元，与所述沉铁单元连接；A first neutralization unit connected to the iron precipitation unit; 第二中和单元，与第一中和单元连接；A second neutralization unit connected to the first neutralization unit; 控制单元，与所述第一中和单元和第二中和单元连接，用于检测所述第一中和单元和第二中和单元内的pH值，并根据其检测的pH值分别控制所述第一中和单元内铁铝渣、镍钴渣的加入量及所述第二中和单元内中和剂的加入量。A control unit is connected to the first neutralization unit and the second neutralization unit, and is used to detect the pH value in the first neutralization unit and the second neutralization unit, and control the amount of iron-aluminum slag and nickel-cobalt slag added to the first neutralization unit and the amount of neutralizer added to the second neutralization unit according to the detected pH value. 根据权利要求1所述的红土镍矿湿法冶金预中和系统，其特征在于，所述第一中和单元包括进料设备、第一反应罐和第二反应罐，所述第一反应罐与所述沉铁单元的出料端连接，所述进料设备与所述第一反应罐连接，用于向所述第一反应罐供入铁铝渣和镍钴渣，所述第二反应罐的进料端与所述第一反应罐连接、出料端与所述第二中和单元连接。The laterite nickel ore hydrometallurgical pre-neutralization system according to claim 1 is characterized in that the first neutralization unit comprises a feeding device, a first reaction tank and a second reaction tank, the first reaction tank is connected to the discharge end of the iron precipitation unit, the feeding device is connected to the first reaction tank, and is used to supply iron-aluminum slag and nickel-cobalt slag to the first reaction tank, the feeding end of the second reaction tank is connected to the first reaction tank, and the discharge end is connected to the second neutralization unit. 根据权利要求2所述的红土镍矿湿法冶金预中和系统，其特征在于，所述控制单元包括第一控制模块和pH监测仪，所述pH监测仪与所述第二反应罐连接，用于监测所述第二反应罐内浆料的pH值，所述第一控制模块与所述pH监测仪和所述进料设备连接，用于通过所述pH监测仪检测的pH值，控制所述进料设备供入所述第一反应罐的铁铝渣和镍钴渣的量。The laterite nickel ore hydrometallurgical pre-neutralization system according to claim 2 is characterized in that the control unit includes a first control module and a pH monitor, the pH monitor is connected to the second reaction tank, and is used to monitor the pH value of the slurry in the second reaction tank, and the first control module is connected to the pH monitor and the feeding device, and is used to control the amount of iron-aluminum slag and nickel-cobalt slag supplied by the feeding device to the first reaction tank through the pH value detected by the pH monitor. 根据权利要求1所述的红土镍矿湿法冶金预中和系统，其特征在于，所述第二中和单元包括进料泵和依序连接的第三反应罐、第四反应罐和第五反应罐，所述第三反应罐与所述第一中和单元的出料端连接，所述进料泵与所述第三反应罐和所述第四反应罐连接，用于向所述第三反应罐和所述第四反应罐通入中和剂。The laterite nickel ore hydrometallurgical pre-neutralization system according to claim 1, characterized in that the second neutralization unit comprises a feed pump and a third reaction tank, a fourth reaction tank and a fifth reaction tank connected in sequence, the third reaction tank is connected to the discharge end of the first neutralization unit, and the feed pump is connected to the third reaction tank and the fourth reaction tank for passing a neutralizer into the third reaction tank and the fourth reaction tank. 根据权利要求4所述的红土镍矿湿法冶金预中和系统，其特征在于，所述控制单元还包括第二控制模块和pH检测仪，所述pH检测仪与所述第五反应罐连接，用于监测所述第五反应罐内浆料的pH值，所述第二控制模块与所述pH检测仪和所述进料泵连接，用于通过所述pH检测仪检测的pH值，控制所述进料泵供入所述第三反应罐和所述第四反应罐的中和剂的量。 The laterite nickel ore hydrometallurgical pre-neutralization system according to claim 4 is characterized in that the control unit also includes a second control module and a pH detector, the pH detector is connected to the fifth reaction tank, and is used to monitor the pH value of the slurry in the fifth reaction tank, and the second control module is connected to the pH detector and the feed pump, and is used to control the amount of neutralizer supplied by the feed pump to the third reaction tank and the fourth reaction tank according to the pH value detected by the pH detector. 根据权利要求1～5所述的红土镍矿湿法冶金预中和系统，其特征在于，所述沉铁单元包括第六反应罐及加料设备，所述加料设备与第六反应罐连接并用于向第六反应罐加入元明粉。The laterite nickel ore hydrometallurgical pre-neutralization system according to claims 1 to 5 is characterized in that the iron precipitation unit includes a sixth reaction tank and a feeding device, and the feeding device is connected to the sixth reaction tank and is used to add sodium sulfate to the sixth reaction tank. 根据权利要求6所述的红土镍矿湿法冶金预中和系统，其特征在于，所述控制单元还用于检测所述第六反应罐内铁离子含量并根据铁离子含量控制所述加料设备是否供入元明粉。The laterite nickel ore hydrometallurgical pre-neutralization system according to claim 6 is characterized in that the control unit is also used to detect the iron ion content in the sixth reaction tank and control whether the feeding device supplies sodium sulfate according to the iron ion content. 根据权利要求1～5任一项所述的红土镍矿湿法冶金预中和系统，其特征在于，红土镍矿湿法冶金预中和系统还包括若干浓密机，各所述浓密机依序排列，首端的所述浓密机与所述第二中和单元连接，尾端所述浓密机用于通过控制进水量，减小尾端所述浓密机外排的底流的液相中铁离子含量以及固相中镍的含量。The laterite-nickel ore hydrometallurgical pre-neutralization system according to any one of claims 1 to 5 is characterized in that the laterite-nickel ore hydrometallurgical pre-neutralization system further comprises a plurality of thickeners, each of which is arranged in sequence, the thickener at the head end is connected to the second neutralization unit, and the thickener at the tail end is used to reduce the iron ion content in the liquid phase of the bottom flow discharged from the thickener at the tail end and the nickel content in the solid phase by controlling the water inflow. 一种红土镍矿湿法冶金预中和方法，其特征在于，通过权利要求1～8任一项所述的红土镍矿湿法冶金预中和系统执行，包括以下步骤：A laterite nickel ore hydrometallurgical pre-neutralization method, characterized in that it is performed by the laterite nickel ore hydrometallurgical pre-neutralization system according to any one of claims 1 to 8, comprising the following steps: S100：将高压浸出浆料通入沉铁单元；S100: passing the high-pressure leaching slurry into the iron precipitation unit; S200：向所述沉铁单元加入元明粉，降低浆料中铁离子含量；S200: adding sodium sulfate to the iron precipitation unit to reduce the iron ion content in the slurry; S300：将沉降单元处理后的浆料输入第一中和单元，向所述第一中和单元加入铁铝渣和镍钴渣，检测第一中和单元内的pH值并根据pH值控制铁铝渣和镍钴渣的加入量；S300: inputting the slurry treated by the sedimentation unit into the first neutralization unit, adding iron-aluminum slag and nickel-cobalt slag to the first neutralization unit, detecting the pH value in the first neutralization unit and controlling the amount of iron-aluminum slag and nickel-cobalt slag added according to the pH value; S400：将第一中和单元处理后的浆料输入第二中和单元，向所述第二中和单元加入中和剂，检测第二中和单元内的pH值并根据pH值控制中和剂的加入量。S400: inputting the slurry treated by the first neutralization unit into the second neutralization unit, adding a neutralizer to the second neutralization unit, detecting the pH value in the second neutralization unit and controlling the amount of the neutralizer added according to the pH value. 根据权利要求9所述的红土镍矿湿法冶金预中和方法，其特征在于，所述步骤S200还包括：检测所述沉铁单元内铁离子含量并根据铁离子含量控制是否供入元明粉；其中，当铁离子含量大于1g/L时，控制供入元明粉，当铁离子含量低于1g/L时，控制停止供入元明粉。The hydrometallurgical pre-neutralization method of laterite nickel ore according to claim 9 is characterized in that the step S200 also includes: detecting the iron ion content in the iron precipitation unit and controlling whether to supply alum according to the iron ion content; wherein, when the iron ion content is greater than 1g/L, the supply of alum is controlled, and when the iron ion content is lower than 1g/L, the supply of alum is controlled to be stopped. 根据权利要求9所述的红土镍矿湿法冶金预中和方法，其特征在于，所述步骤S300包括：The laterite nickel ore hydrometallurgical pre-neutralization method according to claim 9, characterized in that step S300 comprises: 将沉降单元处理后的浆料输入第一中和单元的第一反应罐，向所述第一反应罐内加入铁铝渣和镍钴渣；The slurry treated by the sedimentation unit is input into the first reaction tank of the first neutralization unit, and iron-aluminum slag and nickel-cobalt slag are added into the first reaction tank; 将第一反应罐内中和反应后的浆料输入第一中和单元的第二反应罐 内，检测第二反应罐内的pH值并根据pH值控制第一反应罐内铁铝渣和镍钴渣的加入量。The slurry after the neutralization reaction in the first reaction tank is input into the second reaction tank of the first neutralization unit. The pH value in the second reaction tank is detected and the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled according to the pH value. 根据权利要求11所述的红土镍矿湿法冶金预中和方法，其特征在于，所述检测第二反应罐内的pH值并根据pH值控制第一反应罐内铁铝渣和镍钴渣的加入量包括：The hydrometallurgical pre-neutralization method for laterite nickel ore according to claim 11, characterized in that the step of detecting the pH value in the second reaction tank and controlling the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank according to the pH value comprises: 若检测第二反应罐内的pH值高于第一阈值范围，则控制增加第一反应罐内铁铝渣和镍钴渣的加入量；If the pH value in the second reaction tank is detected to be higher than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to increase; 若检测第二反应罐内的pH值低于第一阈值范围，则控制降低第一反应罐内铁铝渣和镍钴渣的加入量。If the pH value in the second reaction tank is detected to be lower than the first threshold range, the amount of iron-aluminum slag and nickel-cobalt slag added to the first reaction tank is controlled to be reduced. 根据权利要求12所述的红土镍矿湿法冶金预中和方法，其特征在于，所述第一阈值范围为0.9～1.1。The laterite nickel ore hydrometallurgical pre-neutralization method according to claim 12, characterized in that the first threshold value ranges from 0.9 to 1.1. 根据权利要求9所述的红土镍矿湿法冶金预中和方法，其特征在于，所述步骤S400包括：The laterite nickel ore hydrometallurgical pre-neutralization method according to claim 9, characterized in that step S400 comprises: 将第一中和单元处理后的浆料输入第二中和单元的第三反应罐内，向所述第三反应罐内加入中和剂；The slurry treated by the first neutralization unit is input into the third reaction tank of the second neutralization unit, and a neutralizing agent is added into the third reaction tank; 将第三反应罐内中和反应后的浆料输入第二中和单元的第四反应罐内，向所述第四反应罐内加入中和剂；The slurry after the neutralization reaction in the third reaction tank is input into the fourth reaction tank of the second neutralization unit, and a neutralizing agent is added into the fourth reaction tank; 将第四反应罐内中和反应后的浆料输入第二中和单元的第五反应罐内，检测第五反应罐内的pH值并根据pH值控制第三反应罐和第四反应罐内中和剂的加入量。The slurry after the neutralization reaction in the fourth reaction tank is input into the fifth reaction tank of the second neutralization unit, the pH value in the fifth reaction tank is detected, and the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled according to the pH value. 根据权利要求14所述的红土镍矿湿法冶金预中和方法，其特征在于，所述检测第五反应罐内的pH值并根据pH值控制第三反应罐和第四反应罐内中和剂的加入量包括：The hydrometallurgical pre-neutralization method for laterite nickel ore according to claim 14, characterized in that the step of detecting the pH value in the fifth reaction tank and controlling the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank according to the pH value comprises: 若检测第五反应罐内的pH值高于第二阈值范围，则控制增加第三反应罐和第四反应罐内中和剂的加入量；If the pH value in the fifth reaction tank is higher than the second threshold value, the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to increase; 若检测第五反应罐内的pH值低于第二阈值范围，则控制降低第三反应罐和第四反应罐内中和剂的加入量。If the pH value in the fifth reaction tank is detected to be lower than the second threshold range, the amount of the neutralizing agent added to the third reaction tank and the fourth reaction tank is controlled to be reduced. 根据权利要求15所述的红土镍矿湿法冶金预中和方法，其特征在于，所述第二阈值范围为1.5～2。 The laterite nickel ore hydrometallurgical pre-neutralization method according to claim 15, characterized in that the second threshold value ranges from 1.5 to 2.
PCT/CN2023/104016 2023-06-29 2023-06-29 Laterite nickel ore hydrometallurgy pre-neutralization system and method Pending WO2025000373A1 (en)

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