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Method for preparing cobaltous sulfate

A technology of cobalt sulfate and dilute sulfuric acid, applied in the direction of cobalt sulfate, etc., can solve the problems of high impurity content of cobalt sulfate and difficulty in meeting the requirements of synthesizing lithium cobalt oxide compounds

Active Publication Date: 2012-11-21
GANZHOU HIGHPOWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional industrial cobalt sulfate has a relatively high impurity content, which is difficult to meet the requirements for the synthesis of lithium cobalt oxide

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0082] Provide crude cobalt hydroxide (Co 53.8%, Ni 0.09%, Cu 1.00%, Mn 0.98%, Zn 1.43%, Fe 1.54%, Cd 0.76%, As 0.05% produced by wet processing of complex materials containing copper and cobalt , Pb 0.26%, Si 0.04%, Ca 0.24%, Mg 0.46%, Na 0.76%), using dilute sulfuric acid as an excellent solvent and impurity remover, liquid-solid ratio 10:1, temperature 65°C, stirring time 1.5h, end point pH It is 1.5, it is excellent in melting and removing impurities, and the first filter residue is retained after filtration. The removal rate of impurity elements: Ni 75.48%, Cu 73.21%, Zn 86.84%, Cd 82.89%.

[0083] After you dissolve impurities, the first filter residue is treated with dilute sulfuric acid + Na 2 SO 3 (Na 2 SO 3 The amount added is 1.5 times the amount required for the complete reaction) leaching, the liquid-solid ratio is 10:1, the temperature is 65°C, the stirring time is 2.5h, the end point pH is 1.5, and the second filtrate is retained after filtration. The leach...

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Abstract

The invention discloses a method for preparing cobaltous sulfate. The method comprises the following steps of: removing impurity elements adsorbed in coarse cobalt hydroxide through selective dissolution; performing reduction leaching on the coarse cobalt hydroxide by using sulfuric acid and sodium sulfite to obtain cobaltous sulfate leaching liquor; removing impurity elements such as manganese, ferrum, arsenic and the like from the cobaltous sulfate leaching liquor through oxidation precipitation; removing impurity elements such as calcium, magnesium and the like through fluorination precipitation; performing deep purification to removing impurities through P204 extraction, and separating nickel and cobalt out through P507 extraction; and crystallizing high-purity cobaltous sulfate solution to obtain the cobaltous sulfate with lower impurity content, wherein the cobaltous sulfate with the lower impurity content can be applied to electrode materials of batteries. The method for preparing the cobaltous sulfate has a simple and practicable process, low production cost and a good application prospect and makes product quality stable.

Description

【Technical field】 [0001] The invention relates to the field of preparation of high-purity battery materials, in particular to a preparation method of cobalt sulfate. 【Background technique】 [0002] Traditional battery electrode materials mostly use lithium cobalt oxide. [0003] However, the traditional industrial cobalt sulfate has a relatively high impurity content, which is difficult to meet the requirements for the synthesis of lithium cobalt oxide. 【Content of invention】 [0004] Based on this, it is necessary to provide a method for preparing cobalt sulfate with low impurity content. [0005] A preparation method for cobalt sulfate, comprising the steps of: [0006] Step 1, providing cobalt hydroxide; [0007] Step 2. Keep the liquid-solid ratio at 7-10:1. Mix cobalt hydroxide and dilute sulfuric acid at 50-90°C, stir for 1-1.5 hours to fully react, and the final pH is 1.5-2. After filtering, keep the first filter residue; [0008] Step 3, adding dilute sulfuric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/10
Inventor 桂金鸣李先柏祝捷
Owner GANZHOU HIGHPOWER TECH CO LTD