A kind of method for removing cobalt from zinc sulfate solution by synergistic deep purification

A zinc sulfate solution, deep purification technology, applied in the improvement of process efficiency, instruments, electrolysis components, etc., can solve the problems of long process and low cobalt removal depth, and achieve the effect of low cost and short process

Active Publication Date: 2022-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The antimony salt purification method is currently the most widely used cobalt removal method, but the cobalt removal depth of the antimony salt purification method is relatively low, resulting in a long process. The factory generally adopts a two-stage or three-stage purification process to meet the purification requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present embodiment provides a method for cobalt removal from a zinc sulfate solution by synergistic deep purification. The xanthate 40mg / L was controlled at a temperature of 90°C and the reaction was stirred; the stirring speed was 300r / min, and the reaction time was 70min. Among them, the zinc sulfate solution contained cobalt 4.681mg / L, zinc 162.52g / L, cadmium 215.93mg / L, chlorine 89.54mg / L, copper 21.24mg / L, iron 0.12mg / L, and pH was 5.00.

[0039] After the reaction solution was separated by filtration, the Co content in it was measured. 2+ concentration. The experimental results show that when 40mg / L xanthate is added, the Co in the final zinc sulfate solution 2+ The concentration is 0.075mg / L.

Embodiment 2

[0051] This embodiment provides a method for cobalt removal from a zinc sulfate solution by synergistic deep purification. The xanthate 20mg / L was controlled at a temperature of 90°C and the reaction was stirred; the stirring speed was 300r / min, and the reaction time was 90min. Wherein, the zinc sulfate solution is the same as that of Example 1.

[0052] After the reaction solution was separated by filtration, the Co content in it was measured. 2+ concentration. The experimental results show that when 20mg / L xanthate is added, Co in the final zinc sulfate solution 2+ The concentration is 0.186mg / L.

Embodiment 3

[0060] This embodiment provides a method for cobalt removal from a zinc sulfate solution by synergistic deep purification. The xanthate 20mg / L was controlled to stir the reaction at a temperature of 90°C; the stirring speed was 300r / min, and the reaction time was 50min. Among them, the zinc sulfate solution contains 6.5 mg / L cobalt, 150 g / L zinc, 200 mg / L cadmium, 0 chlorine, 18 mg / L copper, 0 iron, and pH 5.00.

[0061] After the reaction solution was separated by filtration, the Co content in it was measured. 2+ concentration. The experimental results show that the Co in the final zinc sulfate solution 2+ The concentration is 0.119mg / L.

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PUM

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Abstract

The invention discloses a method for cobalt removal from zinc sulfate solution by synergistic deep purification. The method is to add xanthate to synergistic purification when antimony salt is purified from zinc sulfate solution to remove cobalt, which can significantly improve the depth of cobalt removal by antimony salt purification. The cobalt content was reduced to 0.1 mg / L. In the method, the amount of additives added is small, the cobalt removal effect is obvious, the depth of industrial cobalt removal can be effectively improved, the requirement of deep purification can be achieved in one step, and industrialization is easy to be realized.

Description

technical field [0001] The invention relates to the technical field of zinc hydrometallurgy, in particular to a method for cobalt removal from a zinc sulfate solution by synergistic deep purification. Background technique [0002] With the use of industrialized large plates, zinc sulfate factories have become more and more strict in controlling the impurity content of zinc sulfate electrolyte. Cobalt is more difficult to remove than copper-cadmium. Cobalt is very harmful in the electrolysis process of zinc sulfate solution. It will not only reduce the current efficiency, seriously endanger the quality of cathode zinc, cause burning, but also make it difficult to achieve mechanical zinc stripping and reduce production efficiency. Therefore, the zinc sulfate solution needs to be deeply purified before electrolytic deposition, and the cobalt in the solution is strictly controlled to a certain concentration to ensure the normal progress of the electrolytic deposition process. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/06C25C1/16
CPCC25C7/06C25C1/16Y02P10/20
Inventor 刘志宏刘智勇向威
Owner CENT SOUTH UNIV
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