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Method for purifying cobalt solution

A purification method and cobalt solution technology, which is applied in the field of cobalt solution purification, can solve the problems of difficult recovery of cobalt salts, pollution of activated carbon, low cobalt recovery rate, etc., and achieve the effects of improving recovery rate, reducing organic matter content, and accelerating extraction speed

Active Publication Date: 2010-09-15
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of removing organic matter has high cost, low efficiency, difficult regeneration, and the cobalt salt is adsorbed at the same time and is difficult to recover, resulting in low cobalt recovery rate, waste activated carbon pollutes the environment, and the organic matter content in the cobalt solution after oil removal is above 20ppm , unable to meet the production requirements of the lithium battery material industry, there is an urgent need for an effective measure to solve this problem

Method used

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  • Method for purifying cobalt solution
  • Method for purifying cobalt solution

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Experimental program
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Effect test

Embodiment 1

[0050] The solvent consists of 0.17 kg of solid cobalt naphthenate and 1.0 m 3 1-bromo-3-chloropropane obtained by mixing (the mass percent concentration of solid cobalt naphthenate is 0.01%), and the volume ratio of solvent to mother liquor is 1:3.3.

[0051] At a stirring speed of 180 rpm, the solvent and cobalt chloride mother liquor (pH value 1.5-2.5, temperature not greater than 35°C) are pumped into the mixing chamber 4 through the solution inlet 2 and stirred and mixed with the solvent. The mixing chamber carries out secondary extraction, the overflow enters the right part of the clarification chamber 6 and settles, and is filtered and separated by the filter plate 5, and then enters the left part of the clarification chamber 6, and flows out from the solution outlet 7 after settling. The inflow velocity of cobalt chloride mother liquor is 1.8m 3 / h, the outflow velocity is basically the same as the inflow velocity. The organic matter content of the obtained cobalt ch...

Embodiment 2

[0055] The solvent consists of 0.24 kg of solid cobalt naphthenate and 1.0 m 3 1-bromo-3-chloropropane obtained by mixing (the mass percent concentration of solid cobalt naphthenate is 0.015%), and the solvent:mother liquor volume ratio is 1:3.0.

[0056] At a stirring speed of 180 rpm, the solvent and cobalt chloride mother liquor (pH value 1.5-2.5, temperature not greater than 35°C) are pumped into the mixing chamber 4 through the solution inlet 2 and stirred and mixed with the solvent. The mixing chamber carries out secondary extraction, the overflow enters the right part of the clarification chamber 6 and settles, and is filtered and separated by the filter plate 5, and then enters the left part of the clarification chamber 6, and flows out from the solution outlet 7 after settling. The inflow velocity of cobalt chloride mother liquor is 1.9m 3 / h, the outflow velocity is basically the same as the inflow velocity. The organic matter content of the obtained cobalt chlorid...

Embodiment 3

[0059] The solvent consists of 0.225 kg of solid cobalt naphthenate and 1.0 m 3 1-bromo-3-chloropropane mixed to obtain (the mass percent concentration of solid cobalt naphthenate is 0.014%), and the solvent:mother liquor volume ratio is 1:3.5.

[0060] At a stirring speed of 180 rpm, the solvent and cobalt chloride mother liquor (pH value 1.5-2.5, temperature not greater than 35°C) are pumped into the mixing chamber 4 through the solution inlet 2 and stirred and mixed with the solvent. The mixing chamber carries out secondary extraction, the overflow enters the right part of the clarification chamber 6 and settles, and is filtered and separated by the filter plate 5, and then enters the left part of the clarification chamber 6, and flows out from the solution outlet 7 after settling. The inflow velocity of cobalt chloride mother liquor is 1.8m 3 / h, the outflow velocity is basically the same as the inflow velocity. The organic matter content of the obtained cobalt chloride ...

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Abstract

The invention relates to a method for purifying cobalt solution which can decrease the organic matter content in the cobalt solution to less than 10ppm. The method comprises the step of removing the organic matter from the cobalt solution through solvent extraction, wherein the cobalt solution is obtained by acid leach, extraction and re-extraction; the solvent contains extracting agent; the extracting agent is 1-bromine-3-chloropropane, carbon trichloride, carbon tetrachloride or 1-bromine-2-chloroethane. The improvement in the invention is that the solvent also contains solid cobalt naphthenate, the mass of which is 0.01% to 0.1% of the extracting agent mass. The invention has the following advantages of efficiently decreasing the organic matter content in the cobalt solution, obtaining the cobalt chloride satisfying the lithium battery, lowering the consumption of the solvent which is easy to regenerate, making up the defect of using activated carbon, obviously promoting the recovery in the process of processing cobalt due to no cobalt salt loss in the solvent and promoting the use ratio of cobalt.

Description

technical field [0001] The invention relates to a method for purifying cobalt solution. Background technique [0002] Before the anode material of lithium battery is calcined, if organic impurities are entrained in cobalt chloride or cobalt sulfate in the previous process, it will lead to disadvantages such as poor crystal structure, low density and low battery capacity of the final product. [0003] Cobalt, as a raw material for lithium battery cathode material processing, is a main form of cobalt ore when it is used in industry. Therefore, how to obtain high-purity cobalt salt with good processing performance has become an important research topic for researchers. . The production process of cobalt salt is usually to prepare pure cobalt chloride or cobalt sulfate, etc. through crushing, acid leaching, impurity removal, extraction, stripping, deoiling and refining of cobalt-containing mineral products or recycled waste materials. The basis of lithium battery materials. ...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B23/00
CPCY02P10/20
Inventor 张爱青牛镇岭
Owner GEM JIANGSU COBALT IND CO LTD
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