Preparation method of low-chloride high-purity cobalt carbonate

A cobalt carbonate, high-purity technology, applied in cobalt carbonate and other directions, to achieve the effect of improving purity, simple process and increasing production capacity

Inactive Publication Date: 2014-07-16
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt powder prepared from electrolysis of cobalt salt solution or hydrogen re

Method used

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  • Preparation method of low-chloride high-purity cobalt carbonate
  • Preparation method of low-chloride high-purity cobalt carbonate
  • Preparation method of low-chloride high-purity cobalt carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Preparation of raw material solution: prepare 1 mol / liter cobalt chloride solution;

[0024] 2. Response:

[0025] Step 1: Add 25 L of prepared cobalt chloride solution, 1 mol / L of cobalt chloride solution into a 50 L reactor, and start stirring to 100 r / min.

[0026] Step 2: Add 20ml of anti-foaming agent, specifically polydimethylsiloxane or polyoxypropylene glyceryl ether.

[0027] The third step: under continuous stirring, add 100mol (8Kg) of solid ammonium bicarbonate at one time;

[0028] Step 4: After adding the ingredients, continue to stir for 1 hour, and then let it stand for 24 hours.

[0029] 3. Washing and drying:

[0030] The material is washed with pure water until the pH value of the solution is 7.6, centrifuged and then dried, specifically at 100°C for 7 hours, and finally passed through a 200-mesh sieve.

[0031] The following table is the analysis of the cobalt carbonate product obtained:

[0032]

[0033] Material properties

B...

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Abstract

The invention relates to a preparation method of low-chloride high-purity cobalt carbonate. The preparation method is characterized by comprising the following steps: using ammonium bicarbonate as a precipitator, adding ammonium bicarbonate which accounts for 4-6 times of molar ratio of cobalt chloride into a cobalt chloride solution containing a foam inhibitor at one time under the conditions of normal temperature and continuous agitation, standing for at least 12 hours, washing a product obtained, filtering and drying to obtain a high-purity cobalt carbonate product. Content of chlorine in the prepared high-purity cobalt carbonate product is less than 500ppm, but the content of chlorine in the prior art is high than 1000ppm. Meanwhile, the preparation method has a simple technology; by the use of ammonium bicarbonate, there is no introduction of new impurity elements; and with the addition of the foam inhibitor, speed of carbon dioxide overflowing from the solution is reduced so as to achieve the effect of full reaction. Thus, purity of the product is raised; overswelling is avoided; and capacity is greatly increased.

Description

technical field [0001] The invention relates to a preparation method of low-chloride high-purity cobalt carbonate. Background technique [0002] In the cemented carbide industry, cobalt powder is used as a binder for the production of cemented carbide. Cobalt powder as cemented carbide binder requires extremely low impurity content. Cobalt powder produced by electrolysis of cobalt salt solution or hydrogen reduction of industrial-grade cobalt oxide is difficult to meet these requirements. At present, most of the cobalt powder used in the production of cemented carbide is made of high-purity cobalt carbonate produced by cobalt salt precipitation method, and then hydrogen reduction or pyrolysis is used to make cobalt powder that meets the requirements. [0003] In recent years, due to the rapid development of the lithium-ion secondary battery industry, the consumption of lithium cobaltate and lithium-cobalt nickel-cobalt manganese oxide, which are cathode materials in the ba...

Claims

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Application Information

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IPC IPC(8): C01G51/06
Inventor 刘飞文荣贾效旭沈立芳任萍吕建波
Owner NINGXIA ORIENT TANTALUM IND
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