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WO2019093053A1 - Procédé de traitement par lixiviation et procédé hydrométallurgique pour minerai d'oxyde de nickel - Google Patents

Procédé de traitement par lixiviation et procédé hydrométallurgique pour minerai d'oxyde de nickel Download PDF

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Publication number
WO2019093053A1
WO2019093053A1 PCT/JP2018/037731 JP2018037731W WO2019093053A1 WO 2019093053 A1 WO2019093053 A1 WO 2019093053A1 JP 2018037731 W JP2018037731 W JP 2018037731W WO 2019093053 A1 WO2019093053 A1 WO 2019093053A1
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Prior art keywords
leaching
sulfuric acid
slurry
concentration
nickel
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Japanese (ja)
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啓明 永井
二郎 早田
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Sumitomo Metal Mining Co Ltd
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Sumitomo Metal Mining Co Ltd
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Priority to PH1/2020/500468A priority Critical patent/PH12020500468B1/en
Publication of WO2019093053A1 publication Critical patent/WO2019093053A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B23/00—Obtaining nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
    • 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 present invention relates to a method of leaching treatment to nickel oxide ore, more specifically, a leaching treatment method of leaching nickel by adding sulfuric acid to a slurry of nickel oxide ore, and nickel oxide ore to which the leaching method is applied It relates to a hydrometallurgical process.
  • the low grade nickel oxide ore is roughly classified into two: limonite ore with high iron grade and low alkali grade such as magnesium and silica, and Saprolite ore containing a large amount of alkali ingredient, HPAL Limonite ore is mainly used as a raw material of the method.
  • nickel oxide ore contains magnesium as an impurity in addition to valuable metals such as nickel and cobalt. Therefore, for example, when the magnesium quality is high in the nickel oxide ore, it is necessary to increase the addition amount of sulfuric acid in order to maintain the target nickel leaching rate in the leaching process.
  • the amount of sulfuric acid added is increased, not only the basic unit of sulfuric acid is increased to increase the cost, but also there is a problem that the progress of equipment corrosion used for the leaching treatment is accelerated. Therefore, in actual operation, the unreacted sulfuric acid concentration (free sulfuric acid concentration) contained in the slurry after the leaching reaction is monitored, and the addition amount of sulfuric acid is controlled so that the free sulfuric acid concentration is within the predetermined range. There is.
  • the present invention has been proposed in view of such circumstances, and provides a method capable of effectively reducing the amount of sulfuric acid used while maintaining a high nickel leaching rate, in a method of leaching treatment for nickel oxide ore.
  • the purpose is
  • the present inventors diligently studied to solve the problems described above.
  • the amount of sulfuric acid added depends on the concentration of metal components in the leaching slurry obtained by the leaching treatment, particularly the concentration of magnesium, in the leaching slurry.
  • concentration of free sulfuric acid By adjusting the concentration of free sulfuric acid to a predetermined concentration, it is found that the amount of sulfuric acid used can be effectively reduced while maintaining a high nickel leaching rate, and the present invention has been completed.
  • a leaching treatment is performed by adding sulfuric acid to a slurry of magnesium oxide-containing nickel oxide ore (ore slurry), and a leaching consisting of a leaching solution containing nickel and a leaching residue
  • the addition amount of the sulfuric acid is adjusted so that the concentration of free sulfuric acid in the leached slurry is in the range of 25 g / L to 55 g / L. It is a leaching method.
  • the third invention of the present invention is the leaching treatment method according to the first or second invention, wherein the magnesium concentration in the leaching slurry is measured by ICP emission spectrometry or atomic absorption spectrometry.
  • a fourth invention of the present invention is a method for wet smelting nickel oxide ore in which valuable metal containing nickel is recovered from nickel oxide ore using sulfuric acid, wherein the slurry of nickel oxide ore (ore slurry) Are subjected to a leaching treatment by adding sulfuric acid thereto to obtain a leaching slurry consisting of a leaching solution containing nickel and a leaching residue, and in the leaching step, the addition amount of the sulfuric acid is obtained by the leaching treatment. And adjusting the concentration of free sulfuric acid in the leached slurry to a predetermined concentration in accordance with the concentration of magnesium in the leached slurry.
  • the present embodiment when expressing as “X to Y” (X and Y are arbitrary numerical values), it means “more than X and less than Y” unless otherwise specified.
  • Leaching method for nickel oxide ore is performed by adding sulfuric acid to a slurry of nickel oxide ore containing magnesium (ore slurry), and a leaching slurry comprising a leachate containing nickel and a leaching residue How to get This leaching method is carried out in a high temperature and pressure environment using, for example, a high temperature pressure vessel (autoclave).
  • a high temperature pressure vessel autoclave
  • the amount of sulfuric acid added to the ore slurry is such that the concentration of free sulfuric acid in the leaching slurry becomes a predetermined concentration according to the magnesium concentration in the leaching slurry obtained by the leaching treatment To adjust.
  • the nickel oxide ore to be subjected to the leaching treatment is mainly so-called laterite ore such as limonite or saprolite ore.
  • the nickel content (content ratio) of laterite ore is usually about 1.0% by mass to about 2.0% by mass, and is contained as a hydroxide or a silica earth (magnesium silicate) mineral.
  • the iron content is about 10% by mass to 50% by mass, and is mainly in the form of trivalent hydroxide (gesite), but a part of divalent iron is contained in siliceous earth mineral Ru.
  • oxide ores containing valuable metals such as nickel, cobalt, manganese, copper and the like, such as manganese lumps and the like stored in the deep sea floor are used.
  • nickel oxide ore is classified at a predetermined classification point to remove oversized ore particles, then water is added to the undersized ore particles to prepare an ore slurry, and the prepared ore slurry is prepared.
  • Sulfuric acid is added to cause a leaching reaction.
  • the concentration of the ore slurry is not particularly limited, but it is preferable to adjust the concentration of the ore in the slurry to about 15% by mass to 45% by mass. If the slurry concentration is less than 15% by mass, large equipment is required to obtain the same residence time during the leaching process. Also, the amount of sulfuric acid added may be relatively increased. On the other hand, when the slurry concentration exceeds 45% by mass, although the scale of the equipment can be reduced, the problem arises that the transport of the high concentration slurry becomes difficult (friction in the pipe frequently, energy is required, etc.).
  • the leaching reaction and high temperature thermal hydrolysis reaction represented by the following formulas (i) to (v) Leaching as sulfate and immobilization of the leached iron sulfate as hematite are performed.
  • the liquid portion of the obtained leaching slurry usually contains divalent and trivalent iron ions in addition to nickel, cobalt and the like.
  • the temperature (leaching reaction temperature) in the leaching treatment is not particularly limited, but is about 220 ° C. to 280 ° C., and preferably about 240 ° C. to 270 ° C. By reacting in such a temperature range, most of iron in the ore can be fixed as hematite. If the reaction temperature is less than 220 ° C., the rate of the high-temperature thermal hydrolysis reaction will be slow, and iron will remain dissolved in the reaction solution, increasing the solution load for removing iron. In addition, as iron is dissolved and remains, the amount of neutralizing agent used to neutralize the dissolved iron in the subsequent treatment increases. On the other hand, if the reaction temperature exceeds 270 ° C, although the high temperature thermal hydrolysis reaction itself is promoted, it becomes difficult to select the material of the reaction container used for high temperature pressure leaching, and the thermal energy cost for temperature rise rises. Do.
  • the amount of addition of sulfuric acid used for the leaching treatment is generally an excess amount, for example, about 300 kg to 400 kg per ton of ore.
  • the magnesium grade in the ore slurry is high, this magnesium consumes a large amount of sulfuric acid to cause the leaching reaction. Therefore, in order to keep the leaching rate of nickel high, it is necessary to increase the addition amount of sulfuric acid used for the leaching treatment.
  • the magnesium grade in the ore slurry is low, it is desirable to keep the leaching rate of nickel high while suppressing the addition amount of sulfuric acid used for the leaching treatment.
  • the amount (addition amount) of sulfuric acid added to the ore slurry in the leaching process is adjusted according to the magnesium concentration in the leached slurry obtained by the leaching process. Specifically, the amount of added sulfuric acid is adjusted so that the concentration of free sulfuric acid in the leached slurry becomes a predetermined concentration, in accordance with the magnesium concentration in the leached slurry obtained by the leaching treatment. For example, according to the magnesium concentration in the leached slurry, the addition amount of sulfuric acid is adjusted so that the free sulfuric acid concentration in the leached slurry is in the range of 25 g / L to 55 g / L.
  • the magnesium concentration in the leached slurry can be measured, for example, by ICP emission spectrometry or atomic absorption spectrometry. According to such a measurement method, the magnesium concentration can be rapidly measured, which is preferable. In addition, since the magnesium concentration can be measured rapidly in this way, even if the magnesium grade in the ore slurry fluctuates, the fluctuation can be detected immediately from the magnesium concentration in the leached slurry, and according to the result, it is promptly It is possible to adjust the concentration of free sulfuric acid to
  • the magnesium grade in the ore slurry to be subjected to leaching treatment is measured, and the amount of added sulfuric acid is adjusted so that the free sulfuric acid concentration in the leached slurry becomes the appropriate range by the magnesium grade in the ore slurry. It is also conceivable to do this.
  • a fluorescent X-ray analysis method is used to measure the magnesium quality of the ore slurry, and in the measurement by the fluorescent X-ray analysis method, including the sample preparation, until the measurement results are obtained It will take a long time of about 8 hours.
  • the magnesium concentration in the leached slurry can be promptly and appropriately determined by the measurement method such as ICP emission analysis or atomic absorption analysis as described above. Since it can be measured, even when the magnesium grade in the ore slurry fluctuates, the amount of added sulfuric acid can be promptly adjusted so that the concentration of free sulfuric acid in the leached slurry is in an appropriate range.
  • the free sulfuric acid concentration in the leached slurry is the concentration of free sulfuric acid at the end of leaching, and is not particularly limited, but is preferably about 25 g / L to 55 g / L, and about 34 g / L to 50 g / L. Is more preferred.
  • the addition amount of sulfuric acid so as to obtain such a free sulfuric acid concentration, it is possible to leach nickel at a high leaching rate from the nickel oxide ore containing magnesium.
  • it is such a free sulfuric acid concentration the leaching residue with high true density can be produced
  • the concentration of free sulfuric acid in the leaching slurry is less than 25 g / L
  • the slurry containing the leaching residue is subjected to a sedimentation operation, the solid content is not sufficiently concentrated or a large amount of SS is present in the supernatant . This is considered to be due to the fact that the reaction rate of high temperature thermal hydrolysis is slow, dehydration of iron hydroxide does not proceed sufficiently, and hematite with low true density is formed.
  • the magnesium concentration in the leached slurry obtained by the leaching treatment is periodically monitored, and the ore to be subjected to the leaching treatment according to the magnesium concentration. Adjust the amount of sulfuric acid added to the slurry. This makes it possible to effectively reduce the amount of sulfuric acid used while maintaining a high nickel leaching rate.
  • the degree of progress of the leaching reaction can be performed by monitoring the grade of nickel in the leached residue discharged, and it is desirable to finely adjust the concentration of free sulfuric acid according to the grade of nickel.
  • wet smelting method of nickel oxide ore is a wet refining method by the high temperature pressure acid leaching method (HPAL method) which leaches under high temperature pressurization.
  • HPAL method high temperature pressure acid leaching method
  • FIG. 2 is a process diagram showing an example of the flow of the hydrometallurgical method of nickel oxide ore.
  • the wet smelting method of nickel oxide ore is the ore slurrying step S1 of crushing or classifying the raw material nickel oxide ore to prepare ore slurry, and adding sulfuric acid to the ore slurry to apply leaching treatment under high temperature pressure and leaching
  • the ore slurrying step S1 is a step of preparing an ore slurry from nickel oxide ore which is a raw material ore, and is a pretreatment step of so-called leaching treatment (leaching step S2). Specifically, in the ore slurrying step S1, after sorting at a predetermined classification point to remove oversized ore particles, water is added to the undersized ore particles to prepare an ore slurry.
  • the classification method of the nickel oxide ore is not particularly limited as long as it can be classified based on the desired particle size, and can be performed by sieving using a grizzly or a vibrating screen. Further, with regard to the classification point, a classification point for obtaining an ore slurry composed of ore particles having a particle diameter value or less desired can be appropriately set.
  • so-called laterite ore such as limonite ore and saprolite ore can be used.
  • the nickel content of laterite ore is usually about 1.0% by weight to 2.0% by weight.
  • magnesium is contained as a impurity at a predetermined ratio.
  • Leaching process S2 is a process of adding sulfuric acid to ore slurry under high temperature pressurization, and leaching valuable metals, such as nickel in ore. Specifically, in the leaching step S2, sulfuric acid is added to the ore slurry using an autoclave, and stirring is performed under the conditions of a temperature of about 220 ° C. to 280 ° C. and a pressure of about 3 MPa to 5 MPa. Generate a slurry.
  • the leaching process in the leaching step S2 is carried out so that the concentration of free sulfuric acid in the leached slurry becomes a predetermined concentration according to the magnesium concentration in the leached slurry obtained.
  • the amount of sulfuric acid (the amount of sulfuric acid added) to be added to the ore slurry to be provided is adjusted.
  • the free sulfuric acid concentration is not particularly limited as long as it is in the above-mentioned range, and it is economically advantageous in consideration of valuable metals such as nickel and cobalt, sulfuric acid, and the price of the neutralizing agent. It is adjustable.
  • the addition amount of sulfuric acid may be adjusted so as to be the free sulfuric acid concentration in the corresponding leached slurry according to the correspondence as shown in Table 1 below, that is, the magnesium concentration in the leached slurry.
  • the free sulfuric acid concentration in the leached slurry when the magnesium concentration in the leached slurry is 10.0 g / L or more is the “reference value A”
  • the magnesium concentration in the leached slurry is 7.5 g / L or more. If it is less than 0 g / L, the amount of sulfuric acid added is adjusted so that the concentration of free sulfuric acid in the leached slurry is "standard value A-2.0 g / L".
  • the free sulfuric acid concentration in the leached slurry should be "reference value A-4.0 g / L”. Adjust the amount of sulfuric acid added.
  • the magnesium concentration in the leached slurry is less than 5.0 g / L, the amount of sulfuric acid added is adjusted so that the free sulfuric acid concentration in the leached slurry becomes "reference value A-6.0 g / L”. adjust.
  • the amount of added sulfuric acid is increased so as to increase the concentration of free sulfuric acid in order to keep the nickel leaching rate high.
  • the magnesium concentration in the leaching slurry is low, the nickel leaching rate can be maintained high even if the amount of added sulfuric acid is reduced.
  • the method for measuring the magnesium concentration in the leached slurry is not particularly limited, but ICP emission analysis and atomic absorption analysis are preferable in that the measurement results can be obtained rapidly. According to the measurement method by ICP emission spectrometry or atomic absorption spectrometry, even if the magnesium grade in the ore slurry fluctuates, the fluctuation can be detected from the magnesium concentration in the leached slurry, and the result is promptly determined according to the result. Adjustment of the amount of added sulfuric acid can be carried out so as to obtain an appropriate concentration of free sulfuric acid.
  • the amount of sulfuric acid used is effective while maintaining the leaching rate of valuable metals such as nickel at a high rate by adjusting the amount of sulfuric acid added according to the magnesium concentration in the leached slurry. Can be reduced to Thus, the leaching process can be efficiently performed, and the valuable metal nickel to be mainly leached can be effectively leached.
  • the concentration of free sulfuric acid in the obtained leaching slurry can be reduced, the amount of neutralizing agent used can be effectively reduced when neutralizing the free sulfuric acid in the pre-neutralization step S3 described later.
  • the pH of the leached slurry obtained in the leaching step S2 is adjusted to a predetermined range and subjected to neutralization treatment. Specifically, for example, the pH of the leaching slurry is adjusted to a desired range, that is, a range of about pH 2.8 to 3.2.
  • the leaching slurry obtained through the leaching step S2 contains excess sulfuric acid as free sulfuric acid as described above, and the pH is low.
  • the free sulfuric acid is neutralized by adding a neutralizing agent to the transferred leached slurry to adjust the pH to a predetermined range.
  • the leaching slurry can be charged into the neutralization treatment tank, and the neutralization treatment can be performed by adding a predetermined amount of the neutralizing agent to the leaching slurry in the tank.
  • the neutralization treatment tank for example, one consisting of only one treatment tank or one consisting of plural treatment tanks arranged in series can be used, and in the first treatment tank on the upstream side, the flush tank is used. Charge the leached slurry discharged from the neutralization treatment tank.
  • the amount of added sulfuric acid is adjusted according to the magnesium concentration in the leached slurry, and the concentration of free sulfuric acid in the obtained leached slurry Since the amount of neutralizing agent used in neutralizing the free sulfuric acid in the pre-neutralization step S3 can be effectively reduced.
  • Solid-Liquid Separation Step In the solid-liquid separation step S4, the leached slurry is mixed with the washing solution, and then solid-liquid separation treatment is performed using a solid-liquid separator such as thickener and the leachate containing valuable metals such as nickel and cobalt. Separate into (crude nickel sulfate aqueous solution) and leaching residue.
  • a solid-liquid separator such as thickener and the leachate containing valuable metals such as nickel and cobalt. Separate into (crude nickel sulfate aqueous solution) and leaching residue.
  • the leaching slurry is first diluted by the washing solution, and then the leaching residue in the leaching slurry is concentrated as a thickener of thickener.
  • nickel and cobalt adhering to the leaching residue can be reduced according to the degree of dilution.
  • nickel and cobalt recovery rates can be improved by connecting and using thickeners having such functions in multiple stages.
  • the pH of the obtained post-neutralization solution is 4 or less, preferably 3.0 to 3.5, more preferably 3. while suppressing the oxidation of the separated leachate.
  • a neutralizing agent such as calcium carbonate is added to the leaching solution so as to be 1 to 3.2, and a post-neutralization solution that is the source of a mother liquor for nickel recovery, and neutralization including trivalent iron as an impurity element Form a sediment slurry.
  • the leaching solution is subjected to neutralization treatment (purification treatment) in this manner to neutralize the excess acid used in the leaching treatment by the HPAL method to form a solution after neutralization, Impurities such as trivalent iron ions and aluminum ions remaining in the inside are removed as neutralized precipitates.
  • neutralization treatment purification treatment
  • the amount of the neutralizing agent used for the neutralization treatment in the neutralization step S5 is also It can be effectively reduced and efficient processing can be performed.
  • the solution after neutralization is a solution based on a leachate obtained by performing leaching treatment with sulfuric acid (leaching step S2), and is a sulfuric acid solution containing nickel and cobalt.
  • the solution after neutralization is the reaction start solution of the sulfurization reaction in the dezincification step S6 and the sulfurization step S7 described later, and the total concentration of the nickel concentration and the cobalt concentration is not particularly limited, but usually 2 g / L to 6 g It is the range of / L.
  • the nickel concentration is usually in the range of 2 g / L to 5 g / L
  • the cobalt concentration is usually in the range of 0.1 g / L to 0.6 g / L.
  • a sulfurizing agent such as hydrogen sulfide gas is added to the solution after neutralization obtained through the neutralization step S5 to sulfide the zinc contained in the solution after neutralization Separately remove in the form of goods.
  • the zinc sulfide formed by the sulfidation treatment with respect to the solution after neutralization is formed and separated and removed to obtain a nickel recovery mother liquor containing nickel and cobalt.
  • a solution after neutralization containing zinc as well as nickel and cobalt is introduced into a pressurized container, and hydrogen sulfide gas or the like is blown into the gas phase to make zinc zinc. And selectively sulfide to cobalt to form zinc sulfide and a nickel recovery mother liquor.
  • a nickel recovery mother liquor from which zinc has been separated can be obtained.
  • a sulfiding agent such as hydrogen sulfide gas is added to cause sulfidation reaction to form a mixed sulfide of nickel and cobalt.
  • the conditions for the sulfurization reaction the conditions are lower than the conditions for the sulfurization reaction for nickel.
  • the sulfiding agent such as hydrogen sulfide gas is blown into the initial solution of the sulfidation reaction, using the mother liquid for nickel recovery obtained through the dezincification step S6 as the initial solution of sulfidation reaction, to cause a sulfidation reaction, A sulfide (mixed sulfide) of nickel and cobalt containing few impurity components and a poor solution (liquid after sulfiding) stabilized at a low concentration of nickel or cobalt are formed.
  • the nickel recovery mother liquor is a sulfuric acid aqueous solution containing nickel and cobalt.
  • the sulfurization treatment in the sulfurization step S7 can be performed using a sulfurization reaction tank or the like, and hydrogen sulfide gas is blown into the gas phase part in the reaction tank to the sulfurization reaction start solution introduced into the sulfurization reaction tank to obtain a solution Sulfurization reaction is caused by dissolving hydrogen sulfide gas in the inside.
  • nickel and cobalt contained in the initial solution of the sulfidation reaction are immobilized as sulfide and recovered.
  • the obtained slurry containing nickel and cobalt sulfides is charged into a sedimentation separator such as thickener and subjected to sedimentation treatment, and only the sulfides are separated from the bottom of the thickener. to recover.
  • the aqueous solution component overflows from the top of the thickener and is recovered as a poor solution.
  • the metal content in the ore slurry was measured using a fluorescent X-ray analyzer, and the metal content in the leached slurry obtained by the leaching treatment was measured by ICP emission spectrometry. Also, the concentration of free sulfuric acid in the leached slurry was measured by a titration method. In addition, the leaching rate of nickel was calculated as [100 ⁇ (nickel grade in leached slurry, nickel grade in nickel ore slurry ore slurry) ⁇ 100 (%)].
  • Examples 1 to 3 An ore slurry was prepared from a raw material ore containing nickel, cobalt, iron, magnesium, zinc and the like, and this was charged into an autoclave, and then 98% sulfuric acid was added to perform leaching treatment under high temperature pressure.
  • the amount of added sulfuric acid is adjusted so that the free sulfuric acid concentration in the leached slurry is in the range of 40 g / L to 50 g / L. I made an adjustment.
  • the leaching conditions were as follows. Solid content ratio of ore slurry: 42% by weight to 45% by weight Magnesium grade of ore slurry: 0.8% by weight to 1.8% by weight ⁇ Flow rate of leaching slurry: 200 m 3 / hour to 250 m 3 / hour ⁇ Temperature in high temperature pressure reaction vessel: 240 ° C. to 260 ° C.
  • Table 2 below shows the nickel leaching rate and the amount of added sulfuric acid in Examples and Comparative Examples.
  • each numerical value in Table 2 is the average value of the day of the result of having extract
  • Example 2 As shown in the results of Table 2, in Examples 1 to 3 in which the amount of added sulfuric acid was adjusted according to the magnesium concentration in the leached slurry obtained by the leaching treatment, it was appropriate while maintaining a high nickel leaching rate. The treatment could be carried out with the amount of added sulfuric acid. In particular, also in Example 3 in which the magnesium grade in the ore slurry is high, it was possible to leach nickel at a high leaching rate.

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Abstract

La présente invention concerne un procédé de traitement par lixiviation de minerai d'oxyde de nickel, qui permet de réduire efficacement l'utilisation d'acide sulfurique tout en conservant un taux élevé de lixiviation de nickel. Le procédé de traitement par lixiviation de la présente invention permet d'obtenir une suspension de lixiviation qui est composée d'un lixiviat qui contient du nickel et d'un résidu de lixiviation, en effectuant un traitement par lixiviation par ajout d'acide sulfurique à une suspension de minerai d'oxyde de nickel contenant du magnésium (une suspension de minerai). Dans ce procédé de traitement par lixiviation, la quantité ajoutée d'acide sulfurique est ajustée de façon que la concentration en acide sulfurique libre dans la suspension de lixiviation obtenue par le traitement par lixiviation soit à une valeur prédéterminée en fonction de la concentration en magnésium dans la suspension de lixiviation.
PCT/JP2018/037731 2017-11-08 2018-10-10 Procédé de traitement par lixiviation et procédé hydrométallurgique pour minerai d'oxyde de nickel Ceased WO2019093053A1 (fr)

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JP2021031698A (ja) * 2019-08-20 2021-03-01 住友金属鉱山株式会社 シックナーによる固液分離方法及びこれを含んだニッケル酸化鉱石の湿式製錬方法

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JP7279546B2 (ja) * 2019-07-02 2023-05-23 住友金属鉱山株式会社 ニッケル酸化鉱石の浸出処理方法及びこれを含む湿式製錬方法
JP7285427B2 (ja) * 2019-07-16 2023-06-02 住友金属鉱山株式会社 ニッケル酸化鉱石の浸出処理方法
JP7658359B2 (ja) * 2022-12-29 2025-04-08 住友金属鉱山株式会社 ニッケル酸化鉱石の高圧硫酸浸出における制御方法

Citations (5)

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JP2005350766A (ja) * 2004-05-13 2005-12-22 Sumitomo Metal Mining Co Ltd ニッケル酸化鉱石の湿式製錬方法
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