Method for removing sulfate radicals in cobalt hydroxide

A cobaltous hydroxide and sulfate technology, applied in the direction of cobalt oxide/cobalt hydroxide, can solve the problems of shortening battery cycle life, reducing catalytic performance, affecting electrical conductivity, etc., achieving good sulfate removal effect and simple and easy process. The effect of line and operation is convenient

Inactive Publication Date: 2012-03-28
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only cleaning with deionized water can’t wash the sulfate group to less than 1%. Such cobaltous hydroxide products are easy to harden, and it is easy to poison cobaltous hydroxide during use, reducing its catalytic performance. Calcined cobaltous oxide Adding it to the positive electrode material of the battery will affect its electrical conductivity and shorten the cycle life of the battery. There is still a big gap between catalysts and nickel-metal hydride batteries that require a sulfate content of less than 0.5%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Remove sulfate radical in cobaltous hydroxide, its concrete steps are as follows:

[0017] a. Transfer the cobaltous hydroxide suspension generated by the reaction to a stirred reactor, let it stand for clarification, and discharge the supernatant;

[0018] b With a liquid-solid ratio volume ratio of 1:1, add an aqueous sodium hydroxide solution with a mass concentration of 1% to the reaction kettle, start stirring, and after stirring for 40 minutes, let it stand for clarification, and discharge the aqueous sodium hydroxide solution;

[0019] c After discharging the aqueous sodium hydroxide solution, pour deionized water into the reactor at a solid-to-liquid volume ratio of 1:1.5, and circulate and wash until the washing liquid pH=8, and maintain the temperature of the reactor at 50°C±5°C during the whole process;

[0020] d Finally, it was filtered and dried, and the sulfate content in the cobaltous oxide product was analyzed to be 0.2%, and the cobaltous hydroxide was...

Embodiment 2

[0022] Go out sulfate radical in cobaltous hydroxide, its concrete steps are as follows:

[0023] a. Transfer the cobaltous hydroxide suspension generated by the reaction to a stirred reactor, let it stand for clarification, and discharge the supernatant;

[0024] b With a liquid-solid ratio volume ratio of 1:2, add an aqueous sodium hydroxide solution with a mass concentration of 3% to the reactor, start stirring, and after stirring for 50 minutes, let it stand for clarification, and discharge the aqueous sodium hydroxide solution;

[0025] c After discharging the aqueous sodium hydroxide solution, pour deionized water into the reactor at a solid-to-liquid volume ratio of 1:3, and circulate and wash until the washing liquid pH=9.5, and maintain the temperature of the reactor at 50°C±5°C during the whole process;

[0026] d Finally, it was filtered and dried, and the sulfate content in the cobaltous oxide product was analyzed to be 0.13%, and the cobaltous hydroxide was calcin...

Embodiment 3

[0028] Go out sulfate radical in cobaltous hydroxide, its concrete steps are as follows:

[0029] a. Transfer the cobaltous hydroxide suspension generated by the reaction to a stirred reactor, let it stand for clarification, and discharge the supernatant;

[0030] b With a liquid-solid ratio volume ratio of 1:3, add an aqueous sodium hydroxide solution with a mass concentration of 5% to the reactor, start stirring, and after stirring for 60 minutes, let it stand for clarification, and discharge the aqueous sodium hydroxide solution;

[0031] c After discharging the aqueous sodium hydroxide solution, pour deionized water into the reactor at a solid-to-liquid volume ratio of 1:5, and circulate and wash until the pH of the washing solution is 10, and maintain the temperature of the reactor at 50°C±5°C throughout the process;

[0032] d Finally, filter and dry, the sulfate content in the cobaltous hydroxide product is 0.1%, and calcining the cobaltous hydroxide to obtain a sulfate...

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PUM

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Abstract

The invention discloses a method for removing sulfate radicals in cobalt hydroxide, relating to a preparation method of cobalt hydroxide and cobalt oxide for batteries in chemical industry. The method is characterized by comprising the following steps of: adding a sodium hydroxide solution to cobalt hydroxide for reacting, washing with deionized water, and finally filtering and drying to obtain the cobalt hydroxide. The method for removing sulfate radicals in the cobalt hydroxide adopts a method combining alkaline pretreatment and traditional wash washing and has the advantages of high efficiency, simple and feasible process, convenience for operation, low cost, good cobalt hydroxide radical removing effect and the like. By using the method disclosed by the invention, the cobalt hydroxide product with sulfate radical content lower than 0.2 percent can be prepared; and the cobalt oxide product with the sulfate radical content lower than 0.2 percent is obtained by calcining the cobalt hydroxide. The method disclosed by the invention has the advantages of simple and feasible process, convenience for operation, low cost, good sulfate radical removing effect and the like.

Description

technical field [0001] The invention discloses a method for removing sulfate radicals in cobaltous hydroxide, relating to a preparation method for cobaltous hydroxide and cobaltous oxide used in chemical industry and batteries. technical background [0002] Cobaltous hydroxide used as a glass colorant, catalyst, and paint drier, and cobalt oxide used as a conductive agent for nickel-metal hydride and nickel-cadmium batteries, are mainly produced with cobalt sulfate as raw materials, because cobalt sulfate There are multiple bonds such as σ bond and π bond in the sulfate radical. When cobalt sulfate solution reacts with alkali, the existence form of sulfate radical in the reaction product is more complex, and physical and chemical adsorption occurs on the surface and interior of cobaltous hydroxide. Only cleaning with deionized water can’t wash the sulfate group to less than 1%. Such cobaltous hydroxide products are easy to harden, and it is easy to poison cobaltous hydroxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 邓洪民李金霞范桂芳
Owner JINCHUAN GROUP LIMITED
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