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Method for synergistically and deeply purifying and removing cobalt from zinc sulfate solution

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

Active Publication Date: 2021-09-24
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] This example provides a method for synergistic deep purification and removal of cobalt from zinc sulfate solution, including: taking 500 mL of zinc sulfate solution in a reactor, heating it to 90 ° C, and then adding 2 g / L of zinc powder and 3 mg / L of antimony salt at the same time, Xanthate 40mg / L, controlled at a temperature of 90°C and stirred for reaction; the stirring speed was 300r / min, and the reaction time was 70min. Among them, the zinc sulfate solution contains 4.681 mg / L cobalt, 162.52 g / L zinc, 215.93 mg / L cadmium, 89.54 mg / L chlorine, 21.24 mg / L copper, 0.12 mg / L iron, and a pH of 5.00.

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

Embodiment 2

[0051] This example provides a method for synergistic deep purification and removal of cobalt from zinc sulfate solution, including: taking 500 mL of zinc sulfate solution in a reactor, heating it to 90 ° C, and then adding 2 g / L of zinc powder and 3 mg / L of antimony salt at the same time, Xanthate 20mg / L, control the stirring reaction at a temperature of 90°C; the stirring speed is 300r / min, and the reaction time is 90min. Wherein, zinc sulfate solution is identical with embodiment 1.

[0052] After the reaction solution was separated by filtration, the Co in it was determined 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 example provides a method for synergistic deep purification and removal of cobalt from zinc sulfate solution, including: taking 500 mL of zinc sulfate solution in a reactor, heating it to 90 ° C, and then adding 2 g / L of zinc powder and 3 mg / L of antimony salt at the same time, Xanthate 20mg / L, control the stirring reaction at a temperature of 90°C; the stirring speed is 300r / min, and the reaction time is 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 a pH of 5.00.

[0061] After the reaction solution was filtered and separated, the Co in it was determined 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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Abstract

The invention discloses a method for synergistically and deeply purifying and removing cobalt from a zinc sulfate solution. The method is characterized in that xanthate is added for synergistical purification when the zinc sulfate solution is subjected to antimony salt purification and cobalt removal, so that the antimony salt purification and cobalt removal depth can be remarkably improved, and the cobalt content can be reduced to 0.1 mg / L. The method is small in additive adding amount, obvious in cobalt removal effect, capable of effectively improving the industrial cobalt removal depth, capable of meeting the requirement for deep purification in one step and easy to industrialize.

Description

technical field [0001] The invention relates to the technical field of zinc hydrometallurgy, in particular to a method for cobalt removal through coordinated deep purification from a zinc sulfate solution. Background technique [0002] With the use of industrialized large plates, the control of the impurity content of the zinc sulfate electrolyte by the zinc sulfate factory is becoming more and more strict. Cobalt is more difficult to remove than copper and 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 of the board, but also make it difficult to achieve mechanical stripping of zinc and reduce production efficiency. Therefore, the zinc sulfate solution needs to be deeply purified before electrolytic deposition, and the cobalt in the solution must be strictly controlled to a certain concentration to ensure the normal progress of...

Claims

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Application Information

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Patent Type & Authority Applications(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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