Production method of electronic-grade cobaltous sulfate solution

A technology of cobalt sulfate solution and production method, which is applied in the chemical industry and can solve problems such as leakage of hazardous chemicals, long process flow, and environmental pollution

Inactive Publication Date: 2018-08-24
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The process is relatively long, and the leaching slag, iron removal slag, calcium magnesium fluoride slag and concentrated crystallization produced during the process will result in a low cobalt metal yield (about 90-92%);
[0006] (2) The addition of NaF puts forward higher requirements for equipment materials, which virtually increases equipment investment, and there are potential safety risks such as personnel poisoning and hazardous chemical leakage. bring about environmental problems;
[0007] (3) Concentration crystallization and centrifugal dehydration consume high energy consumption, equipment investment is large, and a large amount of acidic wastewater is produced, causing environmental pollution;
[0008] Therefore, cobalt sulfate products produced by traditional processes have high cost, large equipment investment, and serious environmental pollution, which is a relatively backward production method.

Method used

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  • Production method of electronic-grade cobaltous sulfate solution
  • Production method of electronic-grade cobaltous sulfate solution
  • Production method of electronic-grade cobaltous sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The production of electronic-grade cobalt sulfate solution is carried out using crude cobalt hydroxide as raw material, which contains Co 27.86%, Ni0.15%, Cu 0.71%, Ca 1.48%, Fe 1.54%, Mn 5.02%, Mg 3.62%, water Shares 2.87%. The production steps are as follows:

[0026] A. Add crude cobalt hydroxide raw materials to cobalt-containing waste water for slurrying. The liquid-solid ratio of slurrying is 3:1. After slurrying, the liquid is dissolved with sulfuric acid and sodium sulfite, and the pH at the end point is controlled to be 1. After reacting for 1.5 hours, filter. The filtrate contains 42.36g / l of cobalt, and the total metal ion concentration is 80.12g / l. Put the filtrate into the iron removal kettle and add an oxidizing agent to carry out the iron removal reaction. At the same time, add soda ash to adjust the pH value, maintain the end point pH=3.1, and obtain After iron removal liquid and iron removal tailings, the iron removal tailings are paid separately;

[...

Embodiment 2

[0033] The production of electronic-grade cobalt sulfate solution is carried out using crude cobalt hydroxide as raw material, which contains Co 23.07%, Ni0.16%, Cu 0.42%, Ca 1.13%, Fe 0.61%, Mn 4.78%, Mg 3.88%, water 33.54% share. The production steps are as follows:

[0034] A. Slurry raw cobalt hydroxide raw materials with new cobalt-containing water. The liquid-solid ratio of slurry is 4.5:1. After slurrying, the solution is dissolved with sulfuric acid and sodium sulfite, and the pH at the end point is controlled to be 1.6. After 1.5 hours of reaction, filter , the filtrate contains cobalt 36.72g / l, and the total metal ion concentration is 69.93g / l. Put the filtrate into the iron removal kettle and add an oxidant to carry out the iron removal reaction. Obtain iron-removing liquid and iron-removing tailings, and pay for iron-removing tailings;

[0035] B, P204 organic extractant and sulfonated kerosene are mixed and prepared in a mass ratio of 3.5:1, and the above mixed ...

Embodiment 3

[0041] The production of electronic-grade cobalt sulfate solution is carried out using crude cobalt hydroxide as raw material, which contains Co 34.46%, Ni0.48%, Cu 2.47%, Ca 1.15%, Fe 1.22%, Mn 5.45%, Mg 5.81%, water 13.51%. The production steps are as follows:

[0042] A. Slurry raw cobalt hydroxide raw materials with cobalt-containing new water. The liquid-solid ratio of the slurry is 6:1. After slurrying, the liquid is dissolved with sulfuric acid and sodium sulfite, and the pH at the end point is controlled to be 2. After reacting for 1.5 hours, filter , the filtrate contains 53.2g / l of cobalt, and the total metal ion concentration is 77.51g / l. Put the filtrate into the iron removal kettle and add an oxidant to carry out the iron removal reaction. Obtain iron-removing liquid and iron-removing tailings, and pay for iron-removing tailings;

[0043] B, P204 organic extractant and sulfonated kerosene are mixed and prepared in a mass ratio of 4:1, and the above-mentioned mixed...

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Abstract

The invention belongs to the technical field of chemical engineering, and relates to a production method of an electronic-grade cobaltous sulfate solution. The production method comprises the steps that cobalt raw materials are subjected to slurrying dissolution and purification and iron removal to obtain a crude cobaltous sulfate solution with the high impurity content, impurities such as Ca, Cuand Mn are removed through a P204 organic extracting agent, obtained raffinate is extracted with a P507 organic extracting agent to separate nickel and cobalt and remove Mg, sulfuric acid is adopted as reverse extraction liquid in the reverse extraction section of the P507 organic extracting agent, then a high-quality refined cobaltous sulfate solution is obtained, supplementary extraction is conducted on the refined cobaltous sulfate solution through the P204 organic extracting agent, Ca and Cu are removed through deep purification, and a high-quality cobaltous sulfate solution is obtained. The impurities are discharged out of the system in an acid pickling mode in all washing sections in the extraction process and then recycled after being organically regenerated.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a production method of electronic-grade cobalt sulfate solution. Background technique [0002] Cobalt sulfate is an important raw material for the preparation of battery cathode material precursors. Domestic and foreign researchers have done a lot of research work on the preparation of lithium cobalt oxide compounds and nickel-cobalt-manganese ternary compounds. However, due to the current industrial-grade cobalt sulfate Salt is difficult to meet the production requirements of battery-grade compounds, so it is necessary to study the purification process and method of cobalt sulfate on this basis. [0003] According to public information, the production of cobalt sulfate mainly uses crude cobalt hydroxide as raw material, which is dissolved with dilute sulfuric acid to obtain a mixed solution of cobalt sulfate with high impurities, which is then reduced and leached by sulfi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/38C22B23/00
CPCC22B3/44C22B23/0461C22B3/3844C22B3/3846Y02P10/20
Inventor 任保佑周林华胡伟李海元高鹏飞曲丽萍蒋昱何艳
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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