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Method for deeply removing cobalt from zinc sulfate leaching liquid

A technology of zinc sulfate solution and leaching solution, which is applied in the field of cobalt removal, can solve the problems of low purification depth of antimony salt and copper salt, unsatisfactory cobalt removal effect, highly toxic arsine hydrogen gas, etc., and achieves easy industrial implementation and removal The effect of high cobalt efficiency and low cost

Inactive Publication Date: 2016-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of replacing cobalt with a single zinc powder is not ideal, even with hundreds of times the equivalent of zinc powder, it is difficult to achieve the effect
Therefore, in the zinc powder replacement process, it is often necessary to add a certain amount of additives, such as arsenic salts, antimony salts, copper salts, etc. Although this measure will improve the effect of zinc powder replacement cobalt removal to a certain extent, it also brings some A series of problems, such as the addition of arsenic salts is easy to produce highly toxic gas of arsine hydrogen, while the purification depth of antimony salts and copper salts is low, and the treated solutions need to be further purified

Method used

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  • Method for deeply removing cobalt from zinc sulfate leaching liquid
  • Method for deeply removing cobalt from zinc sulfate leaching liquid
  • Method for deeply removing cobalt from zinc sulfate leaching liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] First, weigh 0.2155gSb 2 o 3 And disperse in water, prepare 100mL activation solution containing 1.8g / L antimony, adjust the pH of the solution to 3.2 with dilute sulfuric acid, then add 12.5g zinc powder (-200 mesh) according to the liquid-solid ratio of 8, and stir at room temperature The reaction was terminated after activation for 55 min, and the filtrate and filter residue were collected by filtration. The filter residue is used as a cobalt removal agent, and the filtrate is returned for use.

[0040] Next, measure 5L of zinc sulfate leaching solution containing 27.6mg / L of cobalt, 134g / L of zinc, and pH of 4.4 in the reactor, start stirring and heat up to 85°C, add the above-mentioned activated zinc powder, and keep warm for reaction After 60 minutes, after filtering, a zinc sulfate solution containing 0.68 mg / L of cobalt can be obtained, and the cobalt removal rate is 97.38%.

[0041] The microscopic morphology and EDS analysis results of antimony activated zi...

Embodiment 2

[0047] First, weigh 0.2155g CuSO 4 ·5H 2 O and dissolved in water, prepared into 150mL activation solution containing 3.6g / L copper, adjusted the pH of the solution to 2.7 with dilute sulfuric acid, then added 10g of zinc powder (-200 mesh) according to the liquid-solid ratio of 15, and stirred at room temperature The reaction was terminated after activation for 50 min, and the filtrate and filter residue were collected by filtration. The filter residue is used as a cobalt removal agent, and the filtrate is returned for use.

[0048] Next, measure 6.4L of zinc sulfate leaching solution containing 27.6mg / L of cobalt, 134g / L of zinc, and pH of 4.4 in the reactor, start stirring and heat up to 80°C, add the above-mentioned activated zinc powder, and keep warm After reacting for 75 minutes, a zinc sulfate solution containing 0.76 mg / L of cobalt can be obtained after filtering, and the cobalt removal rate is 97.62%.

[0049] The microscopic morphology and EDS analysis results of...

Embodiment 3

[0051] First, successively weigh 0.1437gSb 2 o 3 and 0.9375gCuSO 4 ·5H 2 O and dispersed in water, prepared into 120mL activation solution containing 1g / L antimony and 2g / L copper, adjusted the pH of the solution to 2.4 with dilute sodium hydroxide, then added 12g zinc powder (-200 order), the reaction was terminated after stirring and activating at room temperature for 35 minutes, and the filtrate and filter residue were collected by filtration. The filter residue is used as a cobalt removal agent, and the filtrate is returned for use.

[0052] Next, measure 7.2L of zinc sulfate leaching solution containing 27.6mg / L of cobalt, 134g / L of zinc, and pH of 4.4 in the reactor, start stirring and heat up to 75°C, add the above-mentioned activated zinc powder, and keep warm After reacting for 45 minutes, a zinc sulfate solution containing 0.55 mg / L of cobalt can be obtained after filtering, and the cobalt removal rate is 98.44%.

[0053] The microscopic morphology and EDS analy...

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Abstract

The invention discloses a method for deeply removing cobalt from zinc sulfate leaching liquid. The method is to add excessive activated zinc powder in cobalt-contained zinc sulfate solution for reaction; and after the reaction is finished, the filtration and the separation are performed to obtain zinc sulfate solution with a cobalt content of lower than 0.8 mg / L, wherein the activated zinc powder is obtained by activated liquid activated zinc powder containing copper and / or antimony and with pH of 2.5-3.5. The method can deeply remove cobalt ions in the zinc sulfate solution with high efficiency and low cost without introducing impurities harm to the zinc electrolysis, and is easy to realize the industrialization.

Description

technical field [0001] The invention relates to a method for removing cobalt from zinc sulfate leaching solution, belonging to the field of zinc hydrometallurgy. Background technique [0002] Cobalt is an impurity element that is extremely harmful to the hydrometallurgy process. When its concentration in the production system exceeds a certain amount, it will lead to a decrease in the quality of the electrolytic zinc, low current efficiency, and a burning phenomenon in severe cases. Therefore, The zinc hydrometallurgy process has extremely strict requirements on the concentration of cobalt in the system, usually requiring a concentration of less than 0.8mg / L, and with the application of technologies such as large plate electrolysis and mechanical zinc stripping, the requirements for cobalt content are more stringent. Therefore, how to deeply remove cobalt in zinc sulfate solution is particularly important for the normal operation of the hydrometallurgy zinc system. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B19/20
CPCC22B3/46C22B19/26Y02P10/20
Inventor 李玉虎刘志宏刘付朋高禄鹏刘智勇李启厚
Owner CENT SOUTH UNIV
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