Method for recycling tellurium from tellurium anode slime

A technology of anode slime and tellurium powder, applied in the direction of element selenium/tellurium, electrolysis process, electrolysis components, etc., can solve the problems of low conversion rate of tetravalent tellurium, harsh working conditions, introduction of impurity iron, etc., and achieve easy operation, implementation and production High practicability and high recovery rate

Active Publication Date: 2016-10-12
YUNNAN CHIHONG RESOURCE COMPREHENSIVE UTILIZATION CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The conventional treatment method for tellurium anode slime is as follows: leaching with sulfuric acid first, then adding hydrochloric acid or sodium chloride, using sodium sulfite to convert hexavalent tellurium into tetravalent tellurium in a high-acid and high-chlorine system, and then neutralizing it into tellurium dioxide. The disadvantage of the method is that the conversion rate of tetravalent tellurium is low, and some tellurium is converted into elemental tellurium due to over-reaction, and high acid and high chlorination are used, the working conditions are harsh, the equipment is corroded, and the cost is high
Patent CN 105399062 A mentions sulfuric acid leaching—reduction of iron powder to tetravalent tellurium—alkaline neutralization of tellurium anode slime treatment method, which recycles tellurium into tellurium dioxide. Although this method can improve the conversion rate of tellurium dioxide, it introduces Impurity iron is removed, and after recovery, it needs to be purified again to meet the product purity requirements.

Method used

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  • Method for recycling tellurium from tellurium anode slime

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Experimental program
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Effect test

Embodiment 1

[0021] Take 120kg of anode slime produced by tellurium electrowinning and place it in a stainless steel reaction kettle, wash it with distilled water 3 times, filter and separate, store the filtrate for later use, add 10L hydrogen peroxide to the filter residue and oxidize it for 2 hours. Analysis of its composition is: Te42.2%, Pb0.004%, Cu0.002%, Si0.1%, Se0.07%, Bi0.002%. Start the stirring and raise the temperature to about 70°C, slowly and evenly add dilute sulfuric acid to the tellurium anode slime, leaching for 3 hours, and control the pH value of the leaching end point to 1.5. Heat the filtrate to 80~85°C and reduce to Te 6+ 1.25 times of theoretical consumption added Na 2 SO 3 Solid, stirred and reacted for 6h and filtered to obtain tellurium powder.

[0022] Then put the coarse tellurium powder in a stainless steel reaction kettle, and slowly add 25% nitric acid by mass fraction to dissolve the tellurium powder. , and then pump anode slime washing water and tellu...

Embodiment 2

[0024] Take 150kg of anode slime produced by tellurium electrowinning and put it in a stainless steel reaction kettle, wash it with distilled water 3 times, filter and separate, store the filtrate for later use, add 15L hydrogen peroxide to the filter residue and oxidize it for 2 hours. Analysis of its composition is: Te44.6%, Pb0.003%, Cu0.001%, Si0.2%, Se0.08%, Bi0.001%. Turn on the stirring and raise the temperature to about 70°C, slowly and evenly add dilute sulfuric acid to the tellurium anode slime, leaching for 3 hours, and control the pH value of the leaching end point to 1. Heat the filtrate to 80~85°C and reduce to Te 6+ 1.4 times of theoretical consumption added Na 2 SO 3 Solid, stirred and reacted for 6h and filtered to obtain tellurium powder.

[0025] Then put the coarse tellurium powder in a stainless steel reaction kettle, and slowly add 28% nitric acid to dissolve the tellurium powder. The reaction is an exothermic reaction. The gas generated is absorbed by...

Embodiment 3

[0027] Take 130kg of anode slime produced by tellurium electrowinning and place it in a stainless steel reaction kettle, wash it with distilled water 3 times, filter and separate, store the filtrate for later use, add 15L hydrogen peroxide to the filter residue and oxidize it for 2 hours. Analysis of its composition is: Te40.5%, Pb0.002%, Cu0.001%, Si0.16%, Se0.06%, Bi0.001%. Turn on the stirring and raise the temperature to about 70°C, slowly and evenly add dilute sulfuric acid to the tellurium anode slime, leaching for 3 hours, and control the pH value of the leaching end point to 1. Heat the filtrate to 80~85°C and reduce to Te 6+ Add Na to 1.5 times of theoretical consumption 2 SO 3 Solid, stirred and reacted for 6h and filtered to obtain tellurium powder.

[0028] Then put the coarse tellurium powder in a stainless steel reaction kettle, and slowly add 20% nitric acid by mass fraction to dissolve the tellurium powder. , and then pump the anode slime washing water and ...

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Abstract

The invention relates to a method for recycling tellurium from tellurium anode slime. By adopting the technical scheme, the method comprises the steps that firstly, distilled water is used for washing tellurium anode slime, hydrogen peroxide is used for completely oxidizing uncleaned Na2TeO3 into Na2TeO4, then, sulfuric acid is slowly added into the tellurium anode slime to leach out tellurium, filtering is performed to obtain a tellurium leaching agent, Na2SO3 is used for reducing Te6+ into crude tellurium powder, then, a saltpeter solution is adopted for dissolving the crude tellurium powder, tellurium electrodeposition regularly-discharged liquid waste or tellurium anode mud washing water is added into the solution for neutralization, the pH value of the reaction endpoint is controlled to 5-6, tellurium is totally converted into tellurium dioxide, impurities are removed from the neutralized solution, finally, the tellurium dioxide is dissolved through the tellurium electrodeposition liquid waste, the solution composition is adjusted to meet the requirement of electrodeposition new liquid compositions, and the solution is returned to the electrodeposition process to produce refined tellurium. Tellurium in anode mud produced by tellurium electrodeposition can be supplemented in time for performing process production tellurium refining, the resource utilization efficiency is improved, the technology is reasonable, operation and implementation are easy, and the tellurium recovery rate is high.

Description

technical field [0001] The invention relates to a method for recycling tellurium from tellurium anode slime. Specifically, it is a method for recycling hexavalent tellurium in anode slime produced by tellurium electrowinning back to the process to produce refined tellurium, which belongs to chemical technology field. Background technique [0002] At present, the production of refined tellurium adopts the electrowinning process. First, the qualified tellurium dioxide is dissolved with sodium hydroxide and configured into Na 2 TeO 3 For electrolysis, stainless steel plates are used as cathode and anode plates, and then electrolysis is performed. The metal tellurium flakes are precipitated at the cathode, and the tellurium flakes are washed with water, dried, and cast into ingots to obtain refined tellurium; the anode reacts to precipitate oxygen. However, part of tetravalent tellurium in the electrolytic solution will also undergo side reactions at the anode and be oxidized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02C25B1/00
CPCC01B19/02C25B1/00
Inventor 张梅裴启飞邓远久侯刚余秋雁杨伟李雪松田维惟刘德国肖明金薛芳李宗兴闫建英
Owner YUNNAN CHIHONG RESOURCE COMPREHENSIVE UTILIZATION CO LTD
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