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A kind of production method of battery grade cobalt sulfate crystal

A production method, cobalt sulfate technology, applied in the field of metallurgy, can solve the problems of high storage and transportation costs, large consumption, and deteriorating operating environment, and achieve the effects of reducing storage and transportation costs, improving cobalt grades, and saving raw materials

Active Publication Date: 2021-03-23
赣州寒锐新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Since it is difficult to completely remove iron by precipitation method, there will inevitably be a small amount of iron in the feed liquid entering the P204 process, and a small amount of iron will be enriched in the organic phase of P204 and P507, affecting the effect of impurity removal and cobalt extraction
In order to ensure the smooth progress of the P204 impurity extraction and P507 cobalt extraction processes, it is necessary to set up the iron stripping step in these two processes, and the stripping iron must use high-concentration HCl. On the one hand, it deteriorates the operating environment and greatly increases the corrosion resistance of the equipment. Requirements, while increasing the difficulty of wastewater treatment
[0005] (2) A large amount of acid will be released during copper extraction, and the copper extraction liquid will directly enter the precipitation method to remove iron, which requires a large amount of alkali to neutralize the acid released during copper extraction, and the consumption of acid and alkali is very large
[0006] (3)CoSO 4 ·7H 2 O crystals have higher water content, lower cobalt content, and higher storage and transportation costs

Method used

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  • A kind of production method of battery grade cobalt sulfate crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment uses copper oxide cobalt ore to prepare cobalt sulfate crystals. For details, please refer to figure 1 ,Proceed as follows:

[0048] (1) Pretreatment: The copper-cobalt oxide ore is crushed and ball-milled to form a pulp, and the mass ratio of particles smaller than 200 meshes in the pulp to all particles is 92%.

[0049] (2) Two-stage leaching:

[0050] In one-stage leaching, after the copper oxide ore is ball-milled and slurried, copper extraction raffinate, concentrated sulfuric acid and a small amount of SO are added 2 Carry out one-stage leaching, the leaching temperature is 80°C, the leaching time is 4h, the liquid-solid ratio is 5 / 1, the stirring speed is 180r / min, the end point pH=3.5, after the end of the one-stage leaching, carry out one-stage filtration, and the one-stage leaching solution enters the precipitation method to remove iron Process, the first-stage leaching residue enters the second-stage leaching process; the second-stage leachi...

Embodiment 2

[0064] (1) Pretreatment: the copper-cobalt oxide ore is crushed and ball-milled to form a pulp, and the mass ratio of particles smaller than 200 meshes in the pulp to all particles is 95%.

[0065] (2) Two-stage leaching:

[0066] In one-stage leaching, after copper oxide ore is ball-milled and slurried, copper extraction raffinate, concentrated sulfuric acid and a small amount of Na 2 S 2 o 5 Carry out one-stage leaching, the leaching temperature is 120°C, the leaching time is 2h, the liquid-solid ratio is 10 / 1, the stirring speed is 280r / min, the end point pH=3.5, after the end of the one-stage leaching, carry out one-stage filtration, and the one-stage leachate enters the precipitation method to remove iron Process, the first-stage leaching residue enters the second-stage leaching process; the second-stage leaching temperature is 120°C, the leaching time is 2h, the liquid-solid ratio is 10 / 1, the stirring speed is 280r / min, the end point pH is 2.0, and a sufficient amount...

Embodiment 3

[0080] (1) Pretreatment: The copper-cobalt oxide ore is crushed and ball-milled to form a pulp, and the mass ratio of particles smaller than 200 meshes in the pulp to all particles is 93%.

[0081] (2) Two-stage leaching:

[0082] In one-stage leaching, after copper oxide ore is ball-milled and slurried, copper extraction raffinate, concentrated sulfuric acid and a small amount of Na 2 SO 3Carry out one-stage leaching, the leaching temperature is 60°C, the leaching time is 8h, the liquid-solid ratio is 4 / 1, the stirring speed is 220r / min, the end point pH=3.0, after the end of the one-stage leaching, carry out one-stage filtration, and the one-stage leachate enters the precipitation method to remove iron process, the first-stage leaching residue enters the second-stage leaching process; the second-stage leaching temperature is 60°C, the leaching time is 8h, the liquid-solid ratio is 4 / 1, the stirring speed is 220r / min, the end point pH=1.8, and a sufficient amount of Na 2 SO...

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Abstract

The invention discloses a production method of battery-grade cobalt sulfate crystals. The steps are as follows: (1) pretreatment: crushing cobalt-containing raw materials and ball milling to form pulp; (2) two-stage leaching: adding acid and reducing agent to the pulp Carry out two stages of leaching; (3) Precipitation method for iron removal: add oxidant and neutralizer to one stage of leachate, control a certain temperature and pH value to form iron slag, and remove Fe in one stage of leachate; (4) Extraction depth for iron removal: Use the extraction method to remove a small amount of Fe in the liquid after iron removal to achieve the purpose of deep Fe removal; (5) P204 extraction of impurities and P507 extraction of cobalt (6) evaporation crystallization and roasting dehydration to obtain CoSO 4 ·xH 2 O crystals. The invention does not need to use hydrochloric acid, improves the operating environment and reduces the anti-corrosion requirements for equipment, and at the same time reduces the difficulty of wastewater treatment; the two-stage leaching process can reduce the burden of the precipitation iron removal process and the P204 impurity extraction process, and at the same time Raw materials are greatly saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production technology of battery-grade anhydrous or hydrated cobalt sulfate crystals. Background technique [0002] With the rapid development of the battery industry, the demand for cobalt sulfate, one of the main raw materials for battery production, is also increasing year by year. At present, the mainstream process route for producing cobalt sulfate is: cobalt raw material→leaching→copper extraction-electrodeposition→iron removal by precipitation method→P204 impurity extraction→P507 cobalt extraction→cobalt sulfate solution→evaporation crystallization→CoSO 4 ·7H 2 O crystals. [0003] This method mainly has the following defects: [0004] (1) Since it is difficult to completely remove iron by precipitation method, there will inevitably be a small amount of iron in the feed liquid entering the P204 process, and a small amount of iron will be enriched in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B15/00C22B3/38C30B28/04C30B29/46
CPCC22B15/0067C22B15/0084C22B23/0415C22B23/0453C30B28/04C30B29/46C22B3/3846Y02P10/20
Inventor 苏中府曾清全谢建银吴孝红
Owner 赣州寒锐新能源科技有限公司
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