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Method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel cobalt hydroxide

A nickel-cobalt hydroxide and nickel sulfate technology, applied in the field of nickel-cobalt hydrometallurgy, can solve the problems of calcium sulfate crystals clogging extraction tanks and pipelines, unable to recover nickel losses, and requiring regular removal, etc. The effect of reducing the loss of nickel and cobalt

Inactive Publication Date: 2020-07-28
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is widely used, but the problem is that calcium oxide neutralizes and removes iron and aluminum, and a large amount of iron and aluminum slag is obtained. The nickel content is 6-12%, which cannot be recovered, resulting in a large amount of nickel loss. The nickel loss rate is about 1.5%.
The existing problems in the removal of calcium and magnesium by extraction are: using P204 to extract and remove calcium, a large amount of calcium sulfate crystals block the extraction tank and pipeline, and the calcium sulfate crystals need to be removed regularly; using P207 to separate magnesium requires a long number of extraction stages. more difficult
[0006] People are in urgent need of a new method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel-cobalt hydroxide, which solves the technical problem that the calcium sulfate crystallization blockage pipeline that exists in the prior art seriously hinders the extraction, and simultaneously improves the nickel-cobalt yield and improves the yield. Productivity

Method used

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  • Method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel cobalt hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The main components of the mixed nickel hydroxide and cobalt intermediate product obtained by high-pressure acid leaching-neutralization and impurity removal-precipitation of lateritic nickel ore in a foreign factory are as follows:

[0047] element Ca co Ni Cu Fe Mg mn Si Al Zn content / % 0.15 3.92 40.85 0.10 0.076 1.46 5.25 0.14 0.24 0.73

[0048] Slurry the above-mentioned mixed nickel-cobalt hydroxide with water, control the liquid-solid ratio to 4:1, add sulfuric acid at 70°C to control the pH value of the slurry to 1.5, and dissolve for 2 hours. Liquid-solid separation obtains manganese slag and nickel-cobalt sulfate solution, and the composition of nickel-cobalt sulfate solution is as follows:

[0049] element Al As Ba be Bi Ca Cd co Content / (g / L) 0.25 <0.001

<0.05

<0.05

<0.05

0.15 <0.001

9.09 element Cr Cu Fe Li Mg mn Ni Pb Content / (g / L) 0.025...

Embodiment 2

[0057] The intermediate product of mixed nickel hydroxide and cobalt obtained by high-pressure acid leaching-neutralization and impurity removal-precipitation of lateritic nickel ore in a foreign factory has a water content of 65%, a dry basis of Ni 35.0%, Co 4.0%, and Mn 5.13%. Slurry the above-mentioned mixed nickel-cobalt hydroxide with water, control the liquid-solid ratio to 3.8:1, add sulfuric acid at 25°C to control the pH value of the slurry to 2.0, and dissolve for 3 hours. Liquid-solid separation obtains manganese slag and nickel-cobalt sulfate solution, and the composition of nickel-cobalt sulfate solution is as follows:

[0058] element Al Ca mn Ni co Mg Content / (g / L) 0.29 0.22 3.36 97.6 8.29 2.0

[0059] Take 500mL of the above solution, heat it to 90°C, add cobalt hydroxide to adjust the pH of the solution to 3.50, remove iron and aluminum for 3 hours, and separate the liquid and solid to obtain the iron-removing aluminum slag ...

Embodiment 3

[0066] The intermediate product of mixed nickel and cobalt hydroxide obtained by high-pressure acid leaching-neutralization and impurity removal-precipitation of lateritic nickel ore in a foreign factory has a water content of 63.5%, a dry basis of Ni 32.0%, Co 3.8%, and Mn 4.62%. Slurry the above-mentioned mixed nickel-cobalt hydroxide with water, control the liquid-solid ratio to 3.5:1, add sulfuric acid at 90°C to control the pH value of the slurry to 1.0, and dissolve for 1 hour. Liquid-solid separation obtains manganese slag and nickel-cobalt sulfate solution, and the composition of nickel-cobalt sulfate solution is as follows:

[0067] element Al Ca mn Ni co Mg Content / (g / L) 0.64 0.36 6.23 90.6 10.83 1.86

[0068] Take 500mL of the above solution, heat it to 60°C, add nickel carbonate to adjust the pH of the solution to 3.50, remove iron and aluminum for 4.0h, and separate the liquid and solid to obtain the iron-removing aluminum slag ...

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Abstract

The invention discloses a method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel cobalt hydroxide, and belongs to the technical field of nickel cobalt hydrometallurgy.The method comprises the following steps that the mixed nickel cobalt hydroxide is leached by using sulfuric acid, iron and aluminum in the solution are removed by using a nickel / cobalt / manganese-based neutralizer, liquid-solid separation is carried out to obtain iron-removed slag, nickel and cobalt are recycled through acid dissolution, a precipitator (one or more of nickel fluoride, and cobalt fluoride and manganese fluoride) is added into iron-removed liquid to remove calcium and magnesium ions in the system. Impurities such as Mn, Cu and Zn are removed from the calcium and magnesium removed liquid by using a saponified P204 extractant, nickel and cobalt are separated from the P204 raffinate by using a saponified P507 extractant to obtain battery-grade nickel sulfate and a cobalt sulfate solution, and evaporative crystallization is carried out to obtain a product. According to the method, the use amount of calcium oxide is greatly reduced, the amount of calcium ions introduced intothe system and the corresponding nickel-cobalt loss are greatly reduced, the influence of calcium sulfate crystallization on extraction is avoided, the P507 extraction operation amount is reduced, andthe purification cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt hydrometallurgy, and relates to a method for preparing battery-grade nickel sulfate and cobalt sulfate from mixed nickel-cobalt hydroxide. Background technique [0002] With the depletion of nickel sulphide ore and the increasing demand for nickel, the extraction of nickel and cobalt from the abundant laterite nickel ore has been attracting more and more attention. At present, the full wet treatment process of laterite nickel ore is mainly high pressure acid leaching. For the convenience of transportation and cost saving, laterite nickel ore is often processed into mixed nickel-cobalt hydroxide (MHP) intermediate product, which is obtained through high-pressure acid leaching-impurity removal-neutralization and precipitation. Mixed nickel-cobalt hydroxide is the production of battery grade It is an important raw material for the production of nickel sulfate, battery grade cobalt sulfate and ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B3/38C22B23/00
CPCC22B3/08C22B3/44C22B23/043C22B23/0461C22B3/3846
Inventor 郑朝振刘三平王海北秦树辰张学东邓超群周起帆王玉芳谢铿苏立峰李强
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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