WO2024207242A1 - Method for full-chain integrated treatment of nickel laterite ore - Google Patents

Abstract

Disclosed in the present application is a method for full-chain integrated treatment of nickel laterite ore, belonging to the technical field of nonferrous metallurgy. The method comprises the following steps: smelting nickel laterite ore pellets, a flux, a reducing agent and a sulfurizing agent to obtain melt reduction and sulfurization slag and molten low-grade nickel matte; carrying out depletion sedimentation separation on the melt reduction and sulfurization slag to obtain cobalt-poor low-grade nickel matte and electric furnace slag; and feeding the molten low-grade nickel matte into a side-blowing furnace and performing blowing to obtain high-grade nickel matte and melt blowing slag. The present application can fully extract components of nickel laterite ore, wherein nickel and cobalt therein are fully recycled, such that the economic value is extremely high.

Description

A method for processing laterite nickel ore in an integrated manner Technical Field

The present application relates to the technical field of nonferrous metallurgy, and in particular to a method for processing laterite nickel ore in an integrated manner throughout the entire chain.

Background Art

Of the global nickel resources, about 60% exist in the form of laterite nickel ore. With the continuous growth in demand for nickel for stainless steel and new energy, laterite nickel ore has gradually become the main supply form of nickel resources due to its relatively rich reserves and low mining difficulty. At present, the smelting process of laterite nickel ore includes two major directions: pyrometallurgy and hydrometallurgy. Generally, pyrometallurgy is suitable for siliceous-magnesia nickel ore with relatively high nickel content, and hydrometallurgy is suitable for limonite-type nickel ore with relatively low nickel content.

The hydrometallurgical process of laterite nickel ore mainly includes three types: reduction roasting-ammonia leaching (Caron process), high pressure acid leaching (HPAL), and atmospheric pressure acid leaching (AL). The three hydrometallurgical processes are respectively suitable for laterite nickel ores with different MgO contents. Since MgO will cause unnecessary consumption of acid in the reaction, thereby increasing costs, the hydrometallurgical process is generally suitable for processing limonite ores with a Mg content of less than 5%. The hydrometallurgical process of laterite nickel ore produces a large amount of leached slag, and the high acid consumption affects subsequent treatment, limiting the large-scale industrial application of the process.

The pyrometallurgical process of laterite nickel ore mainly includes rotary kiln-electric furnace (RKEF) process, blast furnace smelting process, rotary kiln direct reduction nickel iron process, rotary hearth furnace process, DC electric furnace process, vertical furnace process, tunnel kiln process, etc. The characteristics of the pyrometallurgical process are low investment, simple equipment and process, low production cost, high freedom of raw material selection, large production capacity, relatively mature process, high nickel recovery rate, and high automation control; the disadvantages are rotary kiln ring formation, low preheating utilization rate, large power consumption, low waste heat utilization rate, high smoke dust rate, high nickel content in smoke dust, inability to recover cobalt in laterite nickel ore, and unsuitable for processing laterite nickel ore with low nickel content and high cobalt content.

Against the backdrop of the global trend toward electrification of automobiles, Indonesia's excellent laterite nickel ore resources have been fully utilized. Based on years of technological development and the urgent need for nickel sulfate and cobalt sulfate for new energy power battery-grade materials, high-grade nickel matte will also become an important source of raw materials for nickel sulfate and cobalt sulfate, quickly filling the gap in nickel for new energy. With the gradual commissioning of Indonesia's nickel iron production capacity, it is not ruled out that there will be a certain degree of overcapacity in the nickel iron link in the future. Switching to high-grade nickel matte will become the choice of many low-cost nickel iron manufacturers. High-grade nickel matte is used to produce electrolytic nickel and various nickel salts. It is a downstream product of laterite nickel ore and nickel sulfide ore. At present, the construction of a "full-chain integrated industrial park" has become the first choice for many laterite nickel ore smelters to reduce costs, increase efficiency and improve market competitiveness. High-grade nickel matte is obtained by processing laterite nickel ore, and then the high-grade nickel matte is subsequently extracted to obtain nickel salts for battery materials, thereby forming a full-chain integrated industrial chain. Therefore, it is urgent to develop a full-chain integrated energy consumption The high-grade nickel matte production process has low cost, high output, high recovery rate of valuable metals, strong material adaptability and environmental friendliness. Therefore, it is of great significance to develop a production process for smelting laterite nickel ore to produce high-grade nickel matte by using oxygen-enriched double-side blowing molten pool smelting reduction sulfidation process.

Related technology discloses a system and method for processing laterite nickel ore, including: a pretreatment unit, having a laterite nickel ore inlet and a laterite nickel ore particle outlet; a mixed pelletizing device, having a laterite nickel ore particle inlet, a reducing agent inlet, a sulfiding agent inlet and a mixed pellet outlet; a pre-reduction sulfiding device, having a mixed pellet inlet and a roasted sand outlet; a smelting device, having a roasted sand inlet, a smelting solvent inlet, a fuel inlet, an oxygen-enriched air inlet, a first low-nickel matte outlet and a smelting slag outlet; a blowing device, having a first low-nickel matte inlet, a blowing solvent inlet, a high-nickel matte outlet and a blowing slag outlet. The process uses the traditional rotary kiln + smelting furnace process to smelt laterite nickel ore, which has a long process, large rotary kiln smoke, poor environmental protection, and high comprehensive energy consumption; the present invention eliminates the rotary kiln roasting system link, and directly uses an oxygen-enriched side-blowing furnace to directly process laterite nickel ore, which has a short process, safety and environmental protection, low comprehensive energy consumption, large processing volume, and low cost.

Related technology discloses a method for extracting nickel and cobalt by circulating sulfidation of laterite nickel ore, the main process route of which is to crush the laterite nickel ore, roast it, sulfide it, smelt it in a molten pool to obtain low-grade nickel matte, finally extract nickel and cobalt by wet treatment, blow it in a converter to obtain cobalt-rich high-grade nickel matte, reduce and sulfide the blowing slag, and collect the smelting flue gas to roast the laterite nickel ore. This process also uses a rotary kiln for pre-reduction roasting and sulfidation, which increases the smelting links and comprehensive energy consumption; the gypsum slag produced in the process needs to be dried before it can be put into the smelting furnace, which increases the drying cost; the flue gas circulation process in this process is complicated, and there are problems such as air leakage and gas leakage risks.

The related technology discloses a process for the smelting reduction of laterite nickel ore by oxygen-enriched coal powder and a smelting reduction furnace. The process for the smelting reduction of laterite nickel ore by oxygen-enriched coal powder comprises: dehydrating the laterite nickel ore to reduce its water content to below 22%; adding the dehydrated laterite nickel ore into the smelting reduction furnace, adding flux at the same time, spraying oxygen-enriched gas, reducing agent and fuel into the molten pool mixing zone of the smelting reduction furnace at a flow rate of 180m/s to 280m/s through a multi-channel spray gun, and raising the temperature in the molten pool of the smelting reduction furnace to 1450°C to 1550°C, so that the materials in the smelting reduction furnace undergo a molten pool smelting reaction and generate nickel-iron alloy and smelting slag; wherein the molten pool mixing zone contains nickel-iron alloy and smelting slag at the same time; discharging smelting slag from the slag outlet, and discharging nickel-iron alloy from the metal outlet. This process belongs to the process of producing nickel iron by smelting reduction of laterite nickel ore, while this process first reduces and sulfides the laterite nickel ore in an oxygen-rich side-blown smelting furnace to produce low-grade nickel matte, and then blows the low-grade nickel matte in an oxygen-rich side-blown blowing furnace to produce high-grade nickel matte. There are obvious differences in the process.

Summary of the invention

The purpose of the present application is to overcome the shortcomings of the prior art and provide a method for processing laterite nickel ore in an integrated manner, which can fully extract the components of laterite nickel ore, and the extracted high-grade nickel matte can become the raw material for preparing battery-grade nickel sulfate and cobalt sulfate, wherein nickel and cobalt are fully recovered, wherein the nickel recovery rate reaches 87-99%, and the cobalt recovery rate reaches 76～98%, with extremely high economic value.

To achieve the above purpose, the technical solution adopted by this application is:

A method for processing laterite nickel ore comprises the following steps:

(1) screening, crushing and drying the laterite nickel ore to obtain a crushed product;

(2) mixing and granulating the crushed material, the first flux, the first reducing agent and the first sulfiding agent to obtain laterite nickel ore pellets;

(3) smelting the laterite nickel ore pellets, the second flux, the second reducing agent and the second sulfiding agent to obtain molten reduced sulfided slag and molten low-nickel matte;

(4) subjecting the molten reduction sulfide slag to depletion, sedimentation and separation to obtain cobalt-depleted and low-nickel matte and electric furnace slag;

(5) adding the electric furnace slag, the third flux, the third reducing agent and the third sulfiding agent into a reduction sulfiding device to carry out a reduction sulfiding reaction to obtain cobalt-depleted low-matte nickel and reduction slag;

(6) grinding the reduced slag to obtain slag ore, mixing the slag ore, a frother, an activator and a collector, and flotation to obtain a nickel-cobalt concentrate and a first tailing slag, and magnetically separating the first tailing slag to obtain a nickel-cobalt alloy and a second tailing slag;

(7) Add molten low-nickel matte, cobalt-depleted low-nickel matte, cobalt-depleted low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, a fourth reducing agent and a fourth flux into a side-blown furnace for blowing to obtain high nickel matte and molten blowing slag.

As a preferred embodiment of the present application, the following steps are also included:

(8) adding the molten blown slag, the fifth flux, the fifth reducing agent and the fourth sulfiding agent into a reduction sulfiding device to carry out a reduction sulfiding reaction to obtain cobalt-rich and low-nickel matte and molten slag;

(9) adding the molten slag and the sixth flux into an oxidation furnace for oxidation smelting to obtain nickel-cobalt-rich magnetite, subjecting the nickel-cobalt-rich magnetite to a first magnetic separation to obtain nickel-cobalt-rich magnetite concentrate and tailings, and subjecting the nickel-cobalt-rich magnetite concentrate to a second magnetic separation to obtain iron concentrate and cobalt-rich nickel matte;

(10) Add the cobalt-rich low-nickel matte, the cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux into a side-blown furnace for blowing to obtain high-grade nickel matte and molten blowing slag.

As a preferred embodiment of the present application, the first flux, the second flux, the third flux, the fourth flux, the fifth flux, the sixth flux and the seventh flux are each independently selected from at least one of quartz stone and limestone.

As a preferred embodiment of the present application, the first reducing agent, the second reducing agent, the third reducing agent, the fourth reducing agent, the fifth reducing agent, and the sixth reducing agent are each independently selected from at least one of blue coke, coke, anthracite, and graphite powder.

As a preferred embodiment of the present application, the first vulcanizing agent, the second first vulcanizing agent, the third vulcanizing agent, and the fourth vulcanizing agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals.

As a preferred embodiment of the present application, the mass ratio of the crushed material, the first flux, the first reducing agent, and the first vulcanizing agent is 1: (0.02-0.13): (0.02-0.17): (0.03-0.22).

As a preferred embodiment of the present application, the mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1: (0.02-0.12): (0.02-0.1): (0.02-0.13).

As a preferred embodiment of the present application, the mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third sulfurizing agent is 1: (0.01-0.1): (0.01-0.13): (0.03-0.15).

As a preferred embodiment of the present application, the mass ratio of the molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, the fourth reducing agent, and the fourth flux is 1: (0.2~0.5): (0.1~0.6): (0.05~0.5): (0.01~0.07): (0.05~0.25).

As a preferred embodiment of the present application, the mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent, and the fourth sulfurizing agent is 1: (0.01-0.11): (0.01-0.12): (0.02-0.18).

As a preferred embodiment of the present application, the mass ratio of the molten slag to the sixth flux is 1:(0.01-0.15).

As a preferred embodiment of the present application, the mass ratio of the cobalt-rich low-nickel matte, the cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1: (0.1-0.7): (0.01-0.08): (0.05-0.25).

As a preferred embodiment of the present application, the foaming agent includes at least one of 2# oil, polyethylene glycol ether, methyl isobutyl carbinol, and triethoxybutane.

As a preferred embodiment of the present application, the activator is Na ₂ S.

As a preferred embodiment of the present application, the collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, pentyl xanthate, hexyl xanthate, phenol xanthate, alcohol xanthate, oxyalkyl alcohol xanthate, fatty acid, alkyl sulfonate, and kerosene.

As a preferred embodiment of the present application, the mass ratio of the slag ore, foaming agent, activator and collector is 1t: (18-55)g: (45-320)g: (48-230)g.

As a preferred embodiment of the present application, the smelting in step (3) is carried out in a furnace smelting, during which the oxygen purity in the smelting furnace is 90% to 98%, the volume concentration of oxygen-enriched air is 50% to 85%, the fuel excess coefficient is 70% to 95%, the total smelting coefficient of the furnace is 70% to 100%, and the smelting temperature is 1250° C. to 1620° C. As a preferred embodiment of the present application, the temperature of the depletion sedimentation separation is 1200° C. to 1480° C., and the depletion separation time is 30 min to 120 min.

As a preferred embodiment of the present application, the blowing temperatures in step (7) and step S2 are both 1210°C to 1350°C.

As a preferred embodiment of the present application, the mass concentration of the sulfuric acid solution in step (8) and step S3 is 10% to 26%.

As a preferred embodiment of the present application, the magnetic field strength of the first magnetic separation is 4100GS to 8200GS, and the magnetic field strength of the second magnetic separation is 2100GS to 3500GS.

The beneficial effects of the present application are as follows: (1) The present application removes the laterite nickel ore by screening, crushing and drying. Most of the physical water is then mixed with the first flux, the first reducing agent and the first sulfiding agent to obtain laterite nickel ore pellets, and then the laterite nickel ore pellets are reduced and sulfided to obtain molten reduced sulfided slag and molten low-matte nickel. The molten reduced sulfided slag is depleted and separated by sedimentation to achieve effective separation of matte, metal element and slag to obtain cobalt-depleted low-nickel matte and electric furnace slag, and the electric furnace slag is further subjected to reduction and sulfidation reaction to make the valuable elements of nickel and cobalt undergo reduction and sulfidation reaction to obtain cobalt-depleted low-matte nickel and reduced slag, and then the reduced slag is crushed to obtain slag ore, and the slag ore is separated by sedimentation. The ore, frother, activator and collector are mixed and then floated to obtain nickel-cobalt concentrate and the first tailings. The first tailings are magnetically separated to obtain nickel-cobalt alloy and the second tailings, wherein the second tailings can be directly sold. Then, the molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate and nickel-cobalt alloy produced in the process are side-blown in the presence of a fourth reducing agent and a fourth flux to obtain molten high nickel matte and molten blowing slag. The molten high nickel matte has high nickel and cobalt contents and is the raw material for preparing battery-grade nickel sulfate and battery-grade cobalt sulfate. (2) The recovery rate of the entire system of the present application is high. The nickel and cobalt produced in each process are collected and then blown, thereby effectively improving the recovery rate. The nickel recovery rate reaches 87-99%, and the cobalt recovery rate reaches 76-98%, with extremely high economic value.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

In the present application, there is no particular limitation on the specific dispersion and stirring treatment methods.

In this application, unless otherwise stated, all parts are parts by mass.

The reagents or instruments used in this application without indicating the manufacturer are all conventional products that can be obtained through commercial purchase.

The present application embodiment provides a method for processing laterite nickel ore, comprising the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 0.3 mm to 10 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 10% to 24%, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 0.85% to 3.34% Ni, 0.01% to 0.27% Co, 7.98% to 39.43% SiO ₂ , 2.99% to 17.49% MgO, 10% to 42.86% Fe;

(2) adding the crushed material, the first flux, the first reducing agent and the first vulcanizing agent to a disc pelletizer for mixing and pelletizing, wherein the pelletizing rate is 90-96% and the diameter of the mixed balls is 5 mm-30 mm, thereby obtaining laterite nickel ore pellets;

(3) Laterite nickel ore pellets, a second flux, a second reducing agent and a second sulfiding agent are smelted through a charging port, fuel, preheated compressed air and oxygen are added to the furnace through a spray gun, and the oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt, and mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called a slag-nickel matte emulsified phase, which contains 80% to 96% (volume) of the furnace. The slag and 3% to 12% (volume) sulfide and metal particles, due to the strong stirring in this area, make the metal or sulfide generated by reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 0.3 to 6 mm, they can quickly fall from the upper bubbling area to the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low nickel matte under the action of gravity. The molten reduction sulfidation slag and molten low nickel matte enter the slag chamber through the duct, the molten reduction sulfidation slag overflows and is discharged, and the molten low nickel matte is discharged through the siphon under the action of pressure;

The molten reduction sulfide slag includes the following main mass components: 11% to 32% Ni, 0.1% to 1.4% Co, 25% to 65% Fe, and 5% to 30% S.

The molten reduction sulfide slag includes the following main mass components: 0.10% to 0.5% Ni, 0.004% to 0.011% Co, and 23% to 46% Fe.

(4) The molten reduction sulfide slag is depleted and separated by sedimentation. The molten reduction sulfide slag is mixed with some low-grade nickel matte and metal elements such as nickel and cobalt. In order to heat-insulate and sediment the slag to achieve effective separation of matte, metal elements and slag, the resistance heat and arc heat generated by the electrodes inserted into the melt can be used. During this period, the cobalt-depleted and low-nickel matte droplets are continuously separated from the slag and settled to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain cobalt-depleted and low-nickel matte. The slag after the cobalt-depleted and low-nickel matte is separated becomes electric furnace slag;

(5) adding the electric furnace slag, the third flux, the third reducing agent and the third sulfiding agent into the reduction sulfiding device for reduction sulfiding reaction, blowing the fuel and oxygen-rich air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfiding reaction to obtain cobalt-depleted low-matte nickel and reduction slag, and discharging the reduction slag into the slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace, and transporting the slag bag filled with reduction slag to the slag bag yard by the slag bag car, and naturally cooling the reduction slag for 20h to 48h, and then spraying water to cool the reduction slag for 10h to 38h until the reduction slag is completely cooled; and crushing and grinding the reduction slag to -200 mesh to -300 mesh to prepare slag ore;

(6) crushing and grinding the cooled reduced slag to -200 mesh to -300 mesh to prepare slag ore, mixing the slag ore, frother, activator and collector and flotation to obtain nickel-cobalt concentrate and first tailings, magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

(7) melting low-nickel matte, cobalt-depleted low-nickel matte, cobalt-depleted low-nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, the fourth reducing agent and the Four fluxes are added into the side-blown furnace for blowing. The molten high-matte nickel produced is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port.

The molten low-nickel matte can also be water quenched and then blown;

The main chemical reaction equations of the blowing process are as follows:
3FeS+5O ₂ =Fe ₃ O ₄ +3SO ₂ (1)
Fe+1/2O ₂ =FeO (2)
2FeS+3O ₂ =2FeO+2SO ₂ (3)
2FeO+SiO ₂ =2FeO·SiO ₂ (4)
Ni ₃ S ₂ +7/2O ₂ =3NiO+2SO ₂ (5)
Ni ₃ S ₂ +2O ₂ =3Ni+2SO ₂ (6)
CoS+O ₂ ＝Co+SO ₂ (7)
2CoS+3O ₂ =2CoO+2SO ₂ (8)
Fe ₃ O ₄ +1/2C＝3FeO+1/2CO ₂ (9)
2NiO+C＝2Ni+CO ₂ (10)
2CoO+C＝2Co+CO ₂ (11)

The present application screens, crushes and dries the laterite nickel ore to remove most of the physical water, and then mixes and granulates the laterite nickel ore with a first flux, a first reducing agent and a first sulfiding agent to obtain laterite nickel ore pellets, and then reduces and sulfides the laterite nickel ore pellets to obtain molten reduced sulfided slag and molten low-nickel matte, depletes and settles the molten reduced sulfided slag to achieve effective separation of matte, metal element and slag to obtain cobalt-depleted low-nickel matte and electric furnace slag, and then reduces and sulfides the electric furnace slag to make the valuable elements of nickel and cobalt undergo reduction and sulfidation to obtain cobalt-depleted low-nickel matte and reduced slag, and then reduces and sulfides the slag. The slag is crushed to obtain slag ore, the slag ore, frother, activator and collector are mixed and then floated to obtain nickel-cobalt concentrate and the first tailings slag, the first tailings slag is magnetically separated to obtain nickel-cobalt alloy and the second tailings slag, wherein the second tailings slag can be directly sold, and then the molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate and nickel-cobalt alloy produced in the process are side-blown in the presence of a fourth reducing agent and a fourth flux to obtain molten high nickel matte and molten blowing slag, the molten high nickel matte has high nickel and cobalt contents and is the raw material for preparing battery-grade nickel sulfate and battery-grade cobalt sulfate.

The whole system of the present application has a high recovery rate. The nickel and cobalt produced in each process are collected and then blown, thereby effectively improving the recovery rate. The nickel recovery rate reaches 87-99%, and the cobalt recovery rate reaches 76-98%, with extremely high economic value.

In the subsequent processing process, high-grade nickel matte can be cast, crushed, ground, and leached with sulfuric acid solution to obtain a mixed solution containing nickel sulfate and cobalt sulfate and leaching residue, and then through extraction and crystallization, battery-grade nickel sulfate and battery-grade cobalt sulfate can be obtained respectively.

Among them, the prepared high-quality nickel matte contains the following main chemical components in mass: Ni 55% to 85%, Co 1.0% to 4.5%, S 4% to 16%, and Fe 3% to 8%.

The molten blowing slag contains the following main chemical components: Ni 0.1%-2.1%, Co 0.01%-0.31%, Fe 23%-52%.

In some embodiments, the following steps are also included:

S1. Adding the molten blowing slag, the fifth flux, the fifth reducing agent and the fourth sulfiding agent into the reduction sulfiding device for reduction sulfiding reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, utilizing the property that the affinity of metal nickel to sulfur is close to that of iron, while the affinity to oxygen is much smaller than that of iron, in the matte making and smelting process with different oxidation degrees, nickel, cobalt and iron oxides are reacted under the action of the sulfiding agent to generate Ni ₃ S ₂ , CoS and FeS, and the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with gangue, and reduction sulfiding is performed to generate cobalt-rich and low-nickel matte and molten slag;

S2, adding the molten slag and the sixth flux into the oxidation furnace for oxidation smelting, so that the iron element in the molten slag is oxidized to generate ferroferric oxide in large quantities, and the ferro-olivine phase is transformed into the magnetite phase. While the magnetite grows, it can be enriched with valuable metals such as nickel and cobalt to form new nickel-rich cobalt magnetite. The nickel-rich cobalt magnetite is subjected to a first magnetic separation to obtain a nickel-rich cobalt magnetite concentrate and tailings. The nickel-rich cobalt magnetite is subjected to a second magnetic separation to obtain an iron concentrate and a cobalt-rich nickel matte ore;

S3. Add the cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, the sixth reducing agent and the seventh flux into the side-blown furnace for blowing to obtain high-grade nickel matte and molten blowing slag.

By reducing and sulfiding the molten blowing slag produced in the above process, utilizing the property that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much smaller than that of iron, in the process of matte making and smelting with different oxidation degrees, nickel, cobalt and iron oxides react under the action of a sulfiding agent to form Ni3S2, CoS and FeS, and the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with the gangue, and reduced and sulfided to form cobalt-rich low-nickel matte and molten slag, which are then oxidized and subjected to secondary magnetic separation to obtain iron concentrate and cobalt-rich nickel matte ore, wherein the cobalt-rich low-nickel matte and cobalt-rich nickel matte ore repeat the above steps (7) and (8), and the nickel and cobalt in the cobalt-rich low-nickel matte and cobalt-rich nickel matte ore are extracted to finally obtain high-grade nickel matte.

The present application can fully extract the components of laterite nickel ore, wherein nickel and cobalt are fully recovered, and the tailings, second tailings and iron concentrate produced in the process can be directly sold, which has great economic benefits.

In some embodiments, the first flux, the second flux, the third flux, the fourth flux, the fifth flux, the sixth flux, and the seventh flux are each independently selected from at least one of quartz and limestone.

In some embodiments, the first reducing agent, the second reducing agent, the third reducing agent, the fourth reducing agent, the fifth reducing agent, and the sixth reducing agent are each independently selected from at least one of blue carbon, coke, anthracite, and graphite powder.

In some embodiments, the first vulcanizing agent, the second first vulcanizing agent, the third vulcanizing agent, and the fourth vulcanizing agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals.

In some embodiments, the mass ratio of the crushed material, the first flux, the first reducing agent, and the first vulcanizing agent is 1: (0.02-0.13): (0.02-0.17): (0.03-0.22).

In some embodiments, the mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1: (0.02-0.12): (0.02-0.1): (0.02-0.13).

In some embodiments, the mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third vulcanizing agent is 1: (0.01-0.1): (0.01-0.13): (0.03-0.15).

In some of the embodiments, the mass ratio of the molten low-nickel matte, the cobalt-poor low-nickel matte, the cobalt-poor low nickel matte, the nickel-cobalt concentrate, the nickel-cobalt alloy, the fourth reducing agent, and the fourth flux is 1: (0.2-0.5): (0.1-0.6): (0.05-0.5): (0.01-0.07): (0.05-0.25).

In some embodiments, the mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent, and the fourth sulfurizing agent is 1: (0.01-0.11): (0.01-0.12): (0.02-0.18).

In some of the embodiments, the mass ratio of the molten slag to the sixth flux is 1:(0.01-0.15).

In some of the embodiments, the mass ratio of the cobalt-rich low-nickel matte, the cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1: (0.1-0.7): (0.01-0.08): (0.05-0.25).

In some embodiments, the foaming agent includes at least one of 2# oil, polyethylene glycol ether, methyl isobutyl carbinol, and triethoxybutane.

In some embodiments, the activating agent is Na ₂ S.

In some embodiments, the collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, amyl xanthate, hexyl xanthate, phenol xanthate, alcohol xanthate, oxyalkyl alcohol xanthate, fatty acid, alkyl sulfonate, and kerosene.

In some embodiments, the mass ratio of the slag ore, foaming agent, activator and collector is 1t: (18-55)g: (45-320)g: (48-230)g.

In some embodiments, the smelting in step (3) is carried out in a smelting furnace. During the smelting, the oxygen purity in the smelting furnace is 90% to 98%, the volume concentration of oxygen-enriched air is 50% to 85%, the fuel excess coefficient is 70% to 95%, the total smelting coefficient of the furnace is 70% to 100%, and the smelting temperature is 1250° C. to 1620° C.

In some embodiments, the temperature of the depletion sedimentation separation is 1200° C. to 1480° C., and the time of the depletion separation is 30 min to 120 min.

In some embodiments, the blowing temperatures in step (7) and step S2 are both 1210°C to 1350°C.

In some embodiments, the mass concentration of the sulfuric acid solution in step (8) and step S3 is 10% to 26%.

In some embodiments, the magnetic field strength of the first magnetic separation is 4100GS to 8200GS, and the The magnetic field strength of the secondary magnetic separation is 2100GS～3500GS.

Example 1

A method for processing laterite nickel ore comprises the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 0.3 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 10%, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 0.85% Ni, 0.27% Co, 7.98% SiO ₂ , 2.99% MgO, 42.86% Fe;

(2) adding the crushed material, quartz stone, anthracite and gypsum to a disc pelletizer for mixing and pelletizing, with a pelletizing rate of 96% and a mixed ball diameter of 5 mm, to obtain laterite nickel ore pellets;

The mass ratio of crushed material, quartz stone, anthracite and gypsum is 1:0.02:0.02:0.22;

(3) Laterite nickel ore pellets, quartz, anthracite and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsified phase, which contains 80% (volume) of The slag and 12% (volume) sulfide and metal particles, due to the strong stirring in this area, make the metal or sulfide generated by reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 0.3mm, they can quickly fall from the upper bubbling area to the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low nickel matte under the action of gravity. The molten reduction sulfidation slag and molten low nickel matte enter the slag chamber through the duct, the molten reduction sulfidation slag overflows and is discharged, and the molten low nickel matte is discharged through the siphon under pressure;

Among them, the mass ratio of laterite nickel ore pellets, quartz stone, anthracite and gypsum is 1:0.02:0.02:0.13;

The fuel is natural gas, the amount of fuel added is 25% of the mass of laterite nickel ore pellets, the amount of preheated compressed air blown is ^12000Nm3 /h; the oxygen purity is 90%, the volume concentration of oxygen-enriched air in the furnace is 50%, the fuel excess coefficient is 70%, the total smelting coefficient of the furnace is 100%, and the smelting temperature is controlled at 1250℃; the composition of the molten low-nickel matte is: Ni11%, Co1.4%, Fe64%, S23%. The main chemical components of the molten reduction sulfide slag are: Ni0.10%, Co0.004%, Fe23%.

(4) adding the molten reduced sulfide slag into a depletion electric furnace for depletion sedimentation separation, and controlling the temperature of the electric furnace to be 1200° C. During this period, cobalt-depleted low-nickel matte droplets are continuously separated from the slag and sedimented to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain cobalt-depleted low-nickel matte. The slag after separation of the cobalt-depleted low-nickel matte becomes electric furnace slag;

(5) adding electric furnace slag, quartz stone, anthracite, and pyrite into a reduction sulfidation device for reduction sulfidation reaction, blowing fuel and oxygen-enriched air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfidation reaction to obtain cobalt-depleted Low-grade nickel matte and reduced slag are discharged into the slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace. The slag bag filled with reduced slag is transported to the slag bag yard by the slag bag car, and the reduced slag is naturally cooled for 20 hours, and then sprayed with water to cool the reduced slag for 10 hours;

Among them, the mass ratio of electric furnace slag, quartz stone, anthracite and pyrite is 1:0.01:0.13:0.03.

(6) crushing and grinding the cooled reduced slag to -200 mesh to prepare slag ore, mixing the slag ore, No. 2 oil, _Na2S , ethyl xanthate and butyl xanthate and flotating to obtain nickel-cobalt concentrate and first tailings, magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

The mass ratio of the slag ore, 2# oil, Na ₂ S, ethyl xanthate and butyl xanthate is 1 ton (t): 18 g: 320 g: 24 g: 24 g.

(7) adding molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone into a side-blown furnace for blowing, blowing in preheated compressed air (blowing amount is ^10000Nm3 /h), continuously performing deironing, desulfurization and slagging blowing operation at a temperature of 1210°C, producing high nickel matte and molten blowing slag, the produced molten high nickel matte is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone is 1:0.2:0.6:0.05:0.07:0.25.

The main components of high-grade nickel matte are: Ni55%, Co1.0%, S16%, Fe8%; the main chemical components of molten blowing slag are: Ni2.1%, Co0.31%, Fe23%.

(8) adding molten blown slag, quartz, anthracite and sulfur into a reduction sulfidation device for reduction sulfidation reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, taking advantage of the fact that the affinity of metal nickel for sulfur is close to that of iron, but the affinity for oxygen is much less than that of iron, and in the process of matte smelting with different oxidation degrees, nickel, cobalt and iron oxides react under the action of a sulfiding agent to generate Ni ₃ S ₂ , CoS and FeS, while the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with gangue, and reduction sulfidation is performed to generate cobalt-rich and low-nickel matte and molten slag;

Among them, the mass ratio of molten blowing slag, quartz stone, anthracite and sulfur is 1:0.11:0.01:0.01.

The fuel is natural gas, and the amount of natural gas injected is 1% of the mass of the molten blowing slag.

(9) adding molten slag and quartz stone into an oxidation furnace for oxidation smelting, blowing oxygen into the molten oxidation atmosphere, heating to 1390° C., and then cooling the temperature to 1150° C. at a rate of 5° C./min, generating nickel-rich cobalt magnetite through a crystallization process, the nickel-rich cobalt magnetite first being subjected to 4100GS strong magnetic separation to separate nickel-rich cobalt magnetite concentrate and tailings, and the nickel-rich cobalt magnetite concentrate being subjected to 2100GS weak magnetic separation to separate iron concentrate and cobalt-rich nickel matte;

Among them, the mass ratio of molten slag to quartz stone is 1:0.15.

(10) Add cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz stone into a side-blown furnace for blowing, blow in preheated compressed air (blowing rate is ^10000Nm3 /h), and continuously carry out deironing, desulfurization, slagging and blowing operations at a temperature of 1210℃ to produce High-grade nickel matte and molten converted slag. The molten high-grade nickel matte produced is continuously discharged through the metal discharge siphon port, and the molten converted slag (at this time, whether it is necessary to undergo re-extraction in steps (8) to (10) again can be determined based on the amount of the molten converted slag) is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke and quartz stone is 1:0.1:0.08:0.25.

Example 2

A method for processing laterite nickel ore comprises the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 5 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to obtain a moisture content of 24% after deep drying and dehydration of the laterite nickel ore, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 3.34% Ni, 0.01% Co, 39.43% SiO ₂ , 17.49% MgO, 10% Fe;

(2) adding the crushed material, quartz stone, anthracite and gypsum to a disc pelletizer for mixing and pelletizing, with a pelletizing rate of 96% and a mixed ball diameter of 30 mm to obtain laterite nickel ore pellets;

The mass ratio of crushed material, quartz stone, anthracite and gypsum is 1:0.02:0.02:0.22;

(3) Laterite nickel ore pellets, quartz stone, coke, and pyrite are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsified phase, which contains 96% (volume) of The slag and 3% (volume) sulfide and metal particles, due to the strong stirring in this area, make the metal or sulfide generated by reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 0.3mm, they can quickly fall from the upper bubbling area to the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low nickel matte under the action of gravity. The molten reduction sulfidation slag and molten low nickel matte enter the slag chamber through the duct, the molten reduction sulfidation slag overflows and is discharged, and the molten low nickel matte is discharged through the siphon under the action of pressure;

Among them, the mass ratio of laterite nickel ore pellets, quartz stone, coke and pyrite is 1:0.12:0.1:0.02;

The fuel is heavy oil, the amount of fuel added is 50% of the mass of laterite nickel ore pellets, the amount of preheated compressed air is ^20000Nm3 /h; the oxygen purity is 98%, the volume concentration of oxygen-enriched air in the furnace is 85%, the fuel excess coefficient is 95%, the total melting coefficient of the furnace is 70%, and the smelting temperature is controlled at 1620℃; the composition of the molten low-nickel matte is: Ni32%, Co0.1%, Fe25%, S30%. The main chemical components of the molten reduction sulfide slag are: Ni0.5%, Co0.011%, Fe46%.

(4) Add the molten reduced sulfide slag into the depletion furnace for depletion sedimentation separation, and control the temperature of the furnace to 1480°C. During this period, the cobalt-depleted low-nickel matte droplets are continuously separated from the slag and settled to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain the cobalt-depleted Low nickel matte, the slag after separation of cobalt-poor low nickel matte becomes electric furnace slag;

(5) adding electric furnace slag, quartz stone, anthracite and sulfur into a reduction sulfidation device for reduction sulfidation reaction, blowing fuel and oxygen-rich air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfidation reaction to obtain cobalt-poor low-matte nickel and reduction slag, and discharging the reduction slag into a slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace. The slag bag filled with reduction slag is transported to a slag bag yard by a slag bag car, and the reduction slag is naturally cooled for 48 hours, and then sprayed with water to cool the reduction slag for 38 hours;

Among them, the mass ratio of electric furnace slag, quartz stone, anthracite and sulfur is 1:0.1:0.01:0.15.

The fuel is natural gas and the spraying amount is 30% of the mass of the electric furnace slag.

(6) crushing and grinding the cooled reduced slag to -300 mesh to prepare slag ore, mixing the slag ore, methyl isobutyl carbinol, _Na2S , and oxalanol black medicine, and flotation to obtain nickel-cobalt concentrate and first tailings, and magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

The mass ratio of slag ore, methyl isobutyl carbinol, Na ₂ S and oxyalkyl alcohol black medicine is 1 ton (t): 55g: 45g: 230g.

(7) adding molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone into a side-blown furnace for blowing, blowing in preheated compressed air (blowing amount is ^33000Nm3 /h), continuously performing deironing, desulfurization and slagging blowing operation at a temperature of 1350°C, producing high nickel matte and molten blowing slag, the produced molten high nickel matte is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone is 1:0.5:0.1:0.5:0.01:0.05.

The main components of high-grade nickel matte are: Ni85%, Co4.5%, S4%, Fe3%; the main chemical components of molten blowing slag are: Ni0.1%, Co0.01%, Fe52%.

(8) adding molten blowing slag, quartz, anthracite and gypsum into a reduction sulfidation device for reduction sulfidation reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, taking advantage of the fact that the affinity of metal nickel for sulfur is close to that of iron, but the affinity for oxygen is much less than that of iron, and in the process of matte smelting with different oxidation degrees, nickel, cobalt and iron oxides react under the action of a sulfiding agent to generate Ni ₃ S ₂ , CoS and FeS, while the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with gangue, and reduction sulfidation is performed to generate cobalt-rich and low-nickel matte and molten slag;

Among them, the mass ratio of molten blowing slag, quartz stone, anthracite and gypsum is 1:0.01:0.12:0.18.

The fuel is natural gas, and the amount of natural gas injected is 9% of the mass of the molten blowing slag.

(9) adding molten slag and quartz stone into an oxidation furnace for oxidation smelting, blowing oxygen into the molten oxidation atmosphere, heating to 1560°C, and then cooling the temperature to 1350°C at a rate of 50°C/min, generating nickel-cobalt-rich magnetite through a crystallization process. The nickel-cobalt-rich magnetite is first separated into nickel-cobalt-rich magnetite concentrate and tailings through an 8200GS strong magnetic separation. The nickel-cobalt-rich magnetite concentrate is then separated into nickel-cobalt-rich magnetite concentrate and tailings through a 8200GS strong magnetic separation process. The iron concentrate and cobalt-rich nickel matte ore are separated by 3500GS weak magnetic separation;

Among them, the mass ratio of molten slag to quartz stone is 1:0.01.

(10) Add cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz stone into a side-blown furnace for blowing, blow preheated compressed air (blowing rate is 33000 ^Nm3 /h), and continuously carry out deironing, desulfurization, slagging and blowing operations at a temperature of 1350°C to produce high-grade nickel matte and molten blowing slag. The produced molten high-grade nickel matte is continuously discharged through a metal discharge siphon port, and the molten blowing slag (at this time, whether it is necessary to re-extract through steps (8) to (10) can be determined based on the amount of the molten blowing slag) is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke and quartz stone is 1:0.7:0.01:0.05.

Example 3

A method for processing laterite nickel ore comprises the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 2 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 15%, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 2.39% Ni, 0.09% Co, 31.42% SiO ₂ , 11.47% MgO, 28.16% Fe;

(2) adding the crushed material, quartz stone, anthracite and gypsum to a disc pelletizer for mixing and pelletizing, with a pelletizing rate of 96% and a mixed ball diameter of 18 mm, to obtain laterite nickel ore pellets;

The mass ratio of crushed material, quartz stone, anthracite and gypsum is 1:0.06:0.08:0.1173;

(3) Laterite nickel ore pellets, quartz, anthracite and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsified phase, which contains 88% (volume) of The slag and 7% (volume) sulfide and metal particles, due to the strong stirring in this area, make the metal or sulfide generated by reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 3.2mm, they can quickly fall from the upper bubbling area to the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low nickel matte under the action of gravity. The molten reduction sulfidation slag and molten low nickel matte enter the slag chamber through the duct, the molten reduction sulfidation slag overflows and is discharged, and the molten low nickel matte is discharged through the siphon under pressure;

Among them, the mass ratio of laterite nickel ore pellets, quartz stone, anthracite and gypsum is 1:0.09:0.075:0.1;

The fuel is heavy oil, the amount of fuel added is 30% of the mass of laterite nickel ore pellets, the amount of preheated compressed air blown is ^15000Nm3 /h; the oxygen purity is 97%, the volume concentration of oxygen-enriched air in the furnace is 82%, and the excess coefficient of fuel combustion is 88%. The total melting coefficient of the furnace is 90%, and the smelting temperature is controlled at 1550°C; the composition of the molten low-nickel matte is: Ni18.97%, Co0.53%, Fe51.20%, S18.34%. The main chemical components of the molten reduction sulfide slag are: Ni0.19%, Co0.008%, Fe36.79%.

(4) adding the molten reduced sulfide slag into a depletion electric furnace for depletion sedimentation separation, and controlling the temperature of the electric furnace to be 1300° C. During this period, cobalt-depleted low-nickel matte droplets are continuously separated from the slag and sedimented to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain cobalt-depleted low-nickel matte. The slag after separation of the cobalt-depleted low-nickel matte becomes electric furnace slag;

(5) adding electric furnace slag, quartz stone, anthracite and sulfur into a reduction sulfidation device for reduction sulfidation reaction, blowing fuel and oxygen-rich air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfidation reaction to obtain cobalt-poor low-matte nickel and reduction slag, and discharging the reduction slag into a slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace. The slag bag filled with reduction slag is transported to a slag bag yard by a slag bag car, and the reduction slag is naturally cooled for 30 hours, and then sprayed with water to cool the reduction slag for 23 hours;

Among them, the mass ratio of electric furnace slag, quartz stone, anthracite and pyrite is 1:0.04:0.08:0.11.

The fuel is pulverized coal, and the spraying amount is 12% of the mass of the electric furnace slag.

(6) crushing and grinding the cooled reduced slag to -200 mesh to prepare slag ore, mixing the slag ore, triethoxybutane, _Na2S , amyl xanthate and hexyl xanthate and flotating to obtain nickel-cobalt concentrate and first tailings, magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

The mass ratio of the slag ore, triethoxybutane, Na ₂ S, amyl xanthate and hexyl xanthate is 1 ton (t): 31 g: 201 g: 78 g: 78 g.

(7) adding molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone into a side-blown furnace for blowing, blowing in preheated compressed air (blowing amount is 25100 ^Nm3 /h), continuously performing deironing, desulfurization and slagging blowing operation at a temperature of 1301°C, producing high nickel matte and molten blowing slag, the produced molten high nickel matte is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke and quartz stone is 1:0.3:0.2:0.15:0.03:0.08.

The main components of high-grade nickel matte are: Ni 80.13%, Co 2.38%, S 10.21%, Fe 6.79%; the main chemical components of molten blowing slag are: Ni 0.42%, Co 0.14%, Fe 35.89%.

(8) adding molten blowing slag, quartz, anthracite and gypsum into a reduction sulfidation device for reduction sulfidation reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, taking advantage of the fact that the affinity of metal nickel for sulfur is close to that of iron, but the affinity for oxygen is much less than that of iron, and in the process of matte smelting with different oxidation degrees, nickel, cobalt and iron oxides react under the action of a sulfiding agent to generate Ni ₃ S ₂ , CoS and FeS, while the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with gangue, and reduction sulfidation is performed to generate cobalt-rich and low-nickel matte and molten slag;

Among them, the mass ratio of molten blowing slag, quartz stone, anthracite and gypsum is 1:0.05:0.1025:0.13.

The fuel is pulverized coal, and the pulverized coal injection amount is 7% of the mass of the molten blowing slag.

(9) adding molten slag and quartz stone into an oxidation furnace for oxidation smelting, blowing oxygen into the molten oxidation atmosphere, heating to 1460° C., and then cooling the temperature to 1320° C. at a rate of 20° C./min, generating nickel-cobalt-rich magnetite through a crystallization process, the nickel-cobalt-rich magnetite first being subjected to 5000GS strong magnetic separation to separate nickel-cobalt-rich magnetite concentrate and tailings, and the nickel-cobalt-rich magnetite concentrate being subjected to 2900GS weak magnetic separation to separate iron concentrate and cobalt-rich nickel matte;

Among them, the mass ratio of molten slag to quartz stone is 1:0.08.

(10) Add cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz stone into a side-blown furnace for blowing, blow preheated compressed air (blowing rate is 25100 ^Nm3 /h), and continuously carry out deironing, desulfurization, slagging and blowing operations at a temperature of 1301°C to produce high-grade nickel matte and molten blowing slag. The produced molten high-grade nickel matte is continuously discharged through a metal discharge siphon port, and the molten blowing slag (at this time, whether it is necessary to re-extract through steps (8) to (10) can be determined based on the amount of the molten blowing slag) is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke and quartz stone is 1:0.2:0.03:0.1.

Example 4

A method for processing laterite nickel ore comprises the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 6.5 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to obtain a moisture content of 19% after deep drying and dehydration of the laterite nickel ore, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 1.98% Ni, 0.09% Co, 16.78% SiO ₂ , 8.43% MgO, 21.37% Fe;

(2) adding the crushed material, quartz stone, anthracite and sulfur to a disc pelletizer for mixing and pelletizing, with a pelletizing rate of 96% and a mixed ball diameter of 13.5 mm to obtain laterite nickel ore pellets;

The mass ratio of crushed material, quartz stone, anthracite and sulfur is 1:0.1032:0.1487:0.1684;

(3) Laterite nickel ore pellets, quartz stone, coke, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-rich air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called slag-nickel matte. The emulsified phase contains 88% (volume) slag and 10% (volume) sulfide and metal particles. Due to the strong stirring in this area, the metals or sulfides generated by reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 3.5 mm, they can quickly fall from the upper bubbling area into the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low-grade nickel matte under the action of gravity. The molten reduction sulfidation slag and the molten low-grade nickel matte enter the slag chamber through the duct. The original sulfide slag overflows and is discharged, and the molten low-grade nickel matte is discharged through a siphon under pressure;

Among them, the mass ratio of laterite nickel ore pellets, quartz stone, coke and gypsum is 1:0.089:0.076:0.105;

The fuel is heavy oil, the amount of fuel added is 30.65% of the mass of laterite nickel ore pellets, the amount of preheated compressed air blown is ^17000Nm3 /h; the oxygen purity is 96%, the volume concentration of oxygen-enriched air in the furnace is 72%, the fuel excess coefficient is 86%, the total smelting coefficient of the furnace is 92%, and the smelting temperature is controlled at 1480℃; the composition of the molten low-nickel matte is: Ni 21.34%, Co 1.1%, Fe 48.35%, S 24.26%. The main chemical components of the molten reduction sulfide slag are: Ni 0.13%, Co 0.02%, Fe 28.94%.

(4) adding the molten reduced sulfide slag into a depletion electric furnace for depletion sedimentation separation, and controlling the temperature of the electric furnace to be 1310° C. During this period, cobalt-depleted low-nickel matte droplets are continuously separated from the slag and sedimented to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain cobalt-depleted low-nickel matte. The slag after separation of the cobalt-depleted low-nickel matte becomes electric furnace slag;

(5) adding electric furnace slag, quartz stone, anthracite, and pyrite into a reduction sulfidation device for reduction sulfidation reaction, blowing fuel and oxygen-rich air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfidation reaction to obtain cobalt-poor low-matte nickel and reduction slag, and discharging the reduction slag into a slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace. The slag bag filled with reduction slag is transported to a slag bag yard by a slag bag car, and the reduction slag is naturally cooled for 31 hours, and then sprayed with water to cool the reduction slag for 22 hours;

Among them, the mass ratio of electric furnace slag, quartz stone, anthracite and pyrite is 1:0.075:0.11:0.088.

The fuel is pulverized coal, and the spraying amount is 23% of the mass of the electric furnace slag.

(6) crushing and grinding the cooled reduced slag to -200 mesh to prepare slag ore, mixing the slag ore, 2# oil, _Na2S , phenol black medicine and alcohol black medicine and flotation to obtain nickel-cobalt concentrate and first tailings, magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

The mass ratio of slag ore, 2# oil, Na ₂ S, phenol black medicine and alcohol black medicine is 1 ton (t): 35g: 210g: 71.5g: 71.5g.

(7) adding molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder and quartz stone into a side-blown furnace for blowing, blowing in preheated compressed air (blowing amount is ^28000Nm3 /h), continuously performing deironing, desulfurization and slagging blowing operation at a temperature of 1290°C, producing high nickel matte and molten blowing slag, the produced molten high nickel matte is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder and quartz stone is 1:0.4:0.3:0.25:0.04:0.2.

The main components of high-grade nickel matte are: Ni71.43%, Co3.89%, S15.62%, Fe7.62%; the main chemical components of blowing slag are: Ni1.32%, Co0.14%, Fe39.78%.

(8) Adding molten blowing slag, quartz, anthracite and gypsum into a reduction sulfidation device for reduction sulfidation reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, using the affinity of metal nickel for sulfur being close to that of iron and its affinity for oxygen being close to that of iron. The property of the nickel, cobalt and iron oxides is far less than that of iron. In the process of matte smelting with different oxidation degrees, nickel, cobalt and iron oxides react with the sulfiding agent to form Ni ₃ S ₂ , CoS and FeS, and the iron sulfides are continuously oxidized into oxides in stages, and then removed by slagging with gangue, and reduced sulfidation is performed to form cobalt-rich and low-nickel matte and molten slag;

Among them, the mass ratio of molten blowing slag, quartz stone, anthracite and gypsum is 1:0.0692:0.00834:0.01065.

The fuel is pulverized coal, and the pulverized coal injection amount is 7.5% of the mass of the molten blowing slag.

(9) adding molten slag and quartz stone into an oxidation furnace for oxidation smelting, blowing oxygen into the molten oxidation atmosphere, heating to 1470° C., and then cooling the temperature to 1235° C. at a rate of 42° C./min, generating nickel-cobalt-rich magnetite through a crystallization process, the nickel-cobalt-rich magnetite first being subjected to 6300GS strong magnetic separation to separate nickel-cobalt-rich magnetite concentrate and tailings, and the nickel-cobalt-rich magnetite concentrate being subjected to 2600GS weak magnetic separation to separate iron concentrate and cobalt-rich nickel matte;

Among them, the mass ratio of molten slag to quartz stone is 1:0.1252.

(10) Add cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz stone into a side-blown furnace for blowing, blow preheated compressed air (blowing rate is 28000 ^Nm3 /h), and continuously carry out deironing, desulfurization, slagging and blowing operations at a temperature of 1290°C to produce high-grade nickel matte and molten blowing slag. The produced molten high-grade nickel matte is continuously discharged through a metal discharge siphon port, and the molten blowing slag (at this time, whether it needs to be extracted again in steps (8) to (10) can be determined based on the amount of the molten blowing slag) is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke and quartz stone is 1:0.35:0.04:0.15.

Example 5

A method for processing laterite nickel ore comprises the following steps:

(1) subjecting the laterite nickel ore to multi-stage screening and crushing to a particle size of 2 mm, and removing free water from the laterite nickel ore by drying in a drying kiln to obtain a water content of 16% after deep drying and dehydration of the laterite nickel ore, thereby obtaining a crushed product;

Among them, laterite nickel ore includes the following main mass components: 1.63% Ni, 0.13% Co, 10.37% SiO ₂ , 12.34% MgO, 36.79% Fe;

(2) adding the crushed material, quartz stone, anthracite and sulfur to a disc pelletizer for mixing and pelletizing, with a pelletizing rate of 96% and a mixed ball diameter of 20 mm, to obtain laterite nickel ore pellets;

The mass ratio of crushed material, quartz stone, anthracite and sulfur is 1:0.07:0.0789:0.18;

(3) Laterite nickel ore pellets, quartz stone, anthracite, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-rich air blown in strongly stirs the high-temperature mixed melt, causing the entire melt in this area to undergo turbulent motion, prompting the added materials to be quickly and evenly distributed in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the furnace. The slag-nickel matte emulsion phase contains 88% (volume) slag and 10% (volume) sulfide and metal particles. Due to the strong stirring in this area, the metal or sulfide generated by reduction sulfidation collides and merges with each other. Once the kinetic stability condition is reached, that is, the particles aggregate and grow to 3.5 mm, they can quickly fall from the upper bubbling area into the lower bottom phase. The melt in the lower part of the furnace is divided into molten reduction sulfidation slag and molten low nickel matte under the action of gravity. The molten reduction sulfidation slag and molten low nickel matte enter the slag chamber through the duct, the molten reduction sulfidation slag overflows and is discharged, and the molten low nickel matte is discharged through the siphon under pressure;

Among them, the mass ratio of laterite nickel ore pellets, quartz stone, anthracite and gypsum is 1:0.05:0.07:0.087;

The fuel is natural gas, the amount of fuel added is 39% of the mass of laterite nickel ore pellets, the amount of preheated compressed air blown is ^16800Nm3 /h; the oxygen purity is 97%, the volume concentration of oxygen-enriched air in the furnace is 82%, the fuel excess coefficient is 94%, the total melting coefficient of the furnace is 76%, and the smelting temperature is controlled at 1530℃; the composition of the molten low-nickel matte is: Ni28.39%, Co0.91%, Fe53.76%, S15.47%. The main chemical components of the molten reduction sulfide slag are: Ni0.34%, Co0.07%, Fe33.46%.

(4) adding the molten reduced sulfide slag into a depletion electric furnace for depletion sedimentation separation, and controlling the temperature of the electric furnace to be 1420° C. During this period, cobalt-depleted low-nickel matte droplets are continuously separated from the slag and sedimented to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain cobalt-depleted low-nickel matte. The slag after separation of the cobalt-depleted low-nickel matte becomes electric furnace slag;

(5) adding electric furnace slag, quartz stone, semi-coke and sulfur into a reduction sulfidation device for reduction sulfidation reaction, blowing fuel and oxygen-enriched air into the molten pool to rapidly raise the temperature, so that the nickel and cobalt valuable elements in the slag undergo reduction sulfidation reaction to obtain cobalt-poor low-matte nickel and reduction slag, and discharging the reduction slag into a slag bag at regular intervals according to the height of the molten pool of the reduction fusion furnace. The slag bag filled with reduction slag is transported to a slag bag yard by a slag bag car, and the reduction slag is naturally cooled for 40 hours, and then sprayed with water to cool the reduction slag for 31 hours;

Among them, the mass ratio of electric furnace slag, quartz stone, lignite and sulfur is 1:0.08:0.064:0.13.

The fuel is pulverized coal, and the spraying amount is 23% of the mass of the electric furnace slag.

(6) crushing and grinding the cooled reduced slag to -200 mesh to prepare slag ore, mixing the slag ore, polyethylene glycol ether, _Na2S , isopropyl xanthate and isobutyl xanthate and flotation to obtain nickel-cobalt concentrate and first tailings, magnetically separating the first tailings to obtain nickel-cobalt alloy and second tailings, wherein the second tailings can be directly sold;

The mass ratio of the slag ore, the polyethylene glycol ether, Na ₂ S, the isopropyl xanthate and the isobutyl xanthate is 1 ton (t): 49 g: 270 g: 90 g: 90 g.

(7) adding molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder and quartz stone into a side-blown furnace for blowing, blowing in preheated compressed air (blowing amount is ^24000Nm3 /h), continuously performing deironing, desulfurization and slagging blowing operation at a temperature of 1260°C, producing high nickel matte and molten blowing slag, the produced molten high nickel matte is continuously discharged through the metal discharge siphon port, and the molten blowing slag is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder and quartz stone is 1:0.35:0.55:0.1:0.06:0.12.

The main components of high-grade nickel matte are: Ni79.81%, Co4.3%, S7.65%, Fe7.34%; the main chemical components of blowing slag are: Ni1.82%, Co0.24%, Fe34.59%.

(8) adding molten blown slag, quartz, graphite powder and gypsum into a reduction sulfidation device for reduction sulfidation reaction, injecting fuel and blowing oxygen-enriched air to provide heat to the molten pool, taking advantage of the fact that the affinity of metal nickel for sulfur is close to that of iron, but the affinity for oxygen is much less than that of iron, and in the process of matte smelting with different oxidation degrees, nickel, cobalt and iron oxides react under the action of a sulfiding agent to generate Ni ₃ S ₂ , CoS and FeS, while the iron sulfide is continuously oxidized into oxides in stages, which are then removed by slagging with gangue, and reduction sulfidation is performed to generate cobalt-rich and low-nickel matte and molten slag;

Among them, the mass ratio of molten blowing slag, quartz stone, graphite powder and gypsum is 1:0.076:0.055:0.15.

The fuel is natural gas, and the amount of natural gas injected is 7% of the mass of the molten blowing slag.

(9) adding molten slag and quartz stone into an oxidation furnace for oxidation smelting, blowing oxygen into the molten oxidation atmosphere, heating to 1440° C., and then cooling the temperature to 1230° C. at a rate of 38° C./min, generating nickel-cobalt-rich magnetite through a crystallization process, the nickel-cobalt-rich magnetite first being subjected to 4300GS strong magnetic separation to separate nickel-cobalt-rich magnetite concentrate and tailings, and the nickel-cobalt-rich magnetite concentrate being subjected to 2400GS weak magnetic separation to separate iron concentrate and cobalt-rich nickel matte;

Among them, the mass ratio of molten slag to quartz stone is 1:0.09.

(10) Add cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz stone into a side-blown furnace for blowing, blow preheated compressed air (blowing rate is 24000 ^Nm3 /h), and continuously carry out deironing, desulfurization, slagging and blowing operations at a temperature of 1260°C to produce high-grade nickel matte and molten blowing slag. The produced molten high-grade nickel matte is continuously discharged through a metal discharge siphon port, and the molten blowing slag (at this time, whether it needs to be extracted again in steps (8) to (10) can be determined based on the amount of the molten blowing slag) is continuously discharged from the slag discharge overflow port;

Among them, the mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke and quartz stone is 1:0.5:0.06:0.2.

Test Case

The main element contents in the high-grade nickel matte products prepared in Examples 1 to 5 are shown in Table 1.

The nickel and cobalt recovery rates of Examples 1 to 5 are shown in Table 2.

It can be seen from Table 1 and Table 3 that the present application can fully extract the components of laterite nickel ore, wherein nickel and cobalt are fully recovered, the nickel recovery rate reaches 87-99%, and the cobalt recovery rate reaches 76-98%, and the economic value is extremely high.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application rather than to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present application.

Claims (15)

A method for processing laterite nickel ore, characterized in that it comprises the following steps: (1) screening, crushing and drying the laterite nickel ore to obtain a crushed product; (2) mixing and granulating the crushed material, the first flux, the first reducing agent and the first sulfiding agent to obtain laterite nickel ore pellets; (3) smelting the laterite nickel ore pellets, the second flux, the second reducing agent and the second sulfiding agent to obtain molten reduced sulfided slag and molten low-nickel matte; (4) subjecting the molten reduction sulfide slag to depletion, sedimentation and separation to obtain cobalt-depleted, low-nickel matte and electric furnace slag; (5) adding the electric furnace slag, the third flux, the third reducing agent, and the third sulfiding agent into a reduction sulfiding device to carry out a reduction sulfiding reaction to obtain cobalt-depleted low-nickel matte and reduction slag; (6) grinding the reduced slag to obtain slag ore, mixing the slag ore, a frother, an activator and a collector, and flotation to obtain a nickel-cobalt concentrate and a first tailing slag, and magnetically separating the first tailing slag to obtain a nickel-cobalt alloy and a second tailing slag; (7) Add molten low-nickel matte, cobalt-depleted low-nickel matte, cobalt-depleted low nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, a fourth reducing agent and a fourth flux into a side-blown furnace for blowing to obtain high nickel matte and molten blowing slag. The method for processing laterite nickel ore according to claim 1, characterized in that it also includes the following steps: (8) adding the molten blown slag, the fifth flux, the fifth reducing agent and the fourth sulfiding agent into a reduction sulfiding device to carry out a reduction sulfiding reaction to obtain cobalt-rich and low-nickel matte and molten slag; (9) adding the molten slag and the sixth flux into an oxidation furnace for oxidation smelting to obtain nickel-cobalt-rich magnetite, subjecting the nickel-cobalt-rich magnetite to a first magnetic separation to obtain nickel-cobalt-rich magnetite concentrate and tailings, and subjecting the nickel-cobalt-rich magnetite concentrate to a second magnetic separation to obtain iron concentrate and cobalt-rich nickel matte; (10) Add the cobalt-rich low-nickel matte, the cobalt-rich nickel matte ore, the sixth reducing agent and the seventh flux into a side-blown furnace for blowing to obtain high-grade nickel matte and molten blowing slag. The method for treating laterite nickel ore according to claim 1 or 2, characterized in that the first flux, the second flux, the third flux, the fourth flux, the fifth flux, the sixth flux, and the seventh flux are each independently selected from at least one of quartz and limestone. The method for treating laterite nickel ore according to claim 1 or 2, characterized in that the first reductant, the second reductant, the third reductant, the fourth reductant, the fifth reductant, and the sixth reductant are each independently selected from at least one of blue coke, coke, anthracite, and graphite powder. The method for treating laterite nickel ore according to claim 1 or 2, characterized in that the first sulfiding agent, the second first sulfiding agent, the third sulfiding agent, and the fourth sulfiding agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals. The method for treating laterite nickel ore according to claim 1 or 2, characterized in that the mass ratio of the crushed material, the first flux, the first reducing agent, and the first sulfiding agent is 1: (0.02-0.13): (0.02-0.17): (0.03-0.22); and/or The mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1: (0.02-0.12): (0.02-0.1): (0.02-0.13); and/or The mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third vulcanizing agent is 1: (0.01-0.1): (0.01-0.13): (0.03-0.15); and/or The mass ratio of the molten low-nickel matte, the cobalt-poor low-nickel matte, the cobalt-poor low nickel matte, the nickel-cobalt concentrate, the nickel-cobalt alloy, the fourth reducing agent, and the fourth flux is 1: (0.2-0.5): (0.1-0.6): (0.05-0.5): (0.01-0.07): (0.05-0.25); and/or The mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent and the fourth vulcanizing agent is 1: (0.01-0.11): (0.01-0.12): (0.02-0.18); and/or The mass ratio of the molten slag to the sixth flux is 1:(0.01-0.15):(0.06-0.2); The mass ratio of the cobalt-rich low-nickel matte, the cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1: (0.1-0.7): (0.01-0.08). The method for treating laterite nickel ore according to claim 1, characterized in that the foaming agent includes at least one of 2# oil, polyethylene glycol ether, methyl isobutyl carbinol, and triethoxybutane. The method for treating laterite nickel ore according to claim 1, characterized in that the activating agent is _Na2S . The method for treating laterite nickel ore according to claim 1, characterized in that the collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, amyl xanthate, hexyl xanthate, phenol xanthate, alcohol xanthate, oxyalkyl alcohol xanthate, fatty acid, alkyl sulfonate, and kerosene. The method for treating laterite nickel ore according to claim 1 is characterized in that the mass ratio of the slag ore, the frother, the activator, and the collector is 1000: (0.018-0.155): (0.045-0.32): (0.048-0.23). The method for processing laterite nickel ore according to claim 1 is characterized in that the smelting in step (3) is carried out in a smelting furnace, the oxygen purity in the smelting furnace is 90% to 98%, and the volume concentration of oxygen-enriched air is 50% to 85% during smelting. The fuel excess coefficient is 70% to 95%, the total melting coefficient of the furnace is 70% to 100%, and the melting temperature is 1250°C to 1620°C. The method for processing laterite nickel ore according to claim 1 is characterized in that the temperature of the depletion sedimentation separation is 1200° C. to 1480° C., and the time of the depletion separation is 30 min to 120 min. The method for processing laterite nickel ore according to claim 2, characterized in that the blowing temperature in step (7) and step S2 is 1210° C. to 1350° C. The method for processing laterite nickel ore according to claim 2, characterized in that the magnetic field strength of the first magnetic separation is 4100GS to 8200GS. The method for processing laterite nickel ore according to claim 2, characterized in that the magnetic field strength of the second magnetic separation is 2100GS to 3500GS.