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Method for recycling tellurium from copper anode slime

A copper anode slime and copper removal technology, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of low tellurium recovery rate and excessive tellurium, and achieve the effects of high tellurium leaching rate, short production cycle and low processing cost.

Active Publication Date: 2013-05-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for recovering tellurium from copper anode slime to improve the tellurium leaching rate in order to solve the problems of low tellurium recovery rate in the wet treatment process of copper anode slime and the tellurium in the subsequent extraction of precious metals exceeds the standard. Reach more than 83 wt%

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] Take 1000 g of copper anode slime containing Te 6.32wt%, the particle size is 100% less than 200 mesh, and the pretreatment temperature is 80 o C, the liquid-solid ratio is 3:1, the leaching solution is 50 g / L sodium chloride, 50 g / L hydrochloric acid and 300 g / L sulfuric acid, and 5 L / (t copper anode slime) is blown into the air per minute, and the stirring blade The rotation speed was 300 r / min, and the reaction was carried out for 2 hours, followed by solid-liquid separation to obtain pretreatment liquid and pretreatment slag (leaching slag), and the pretreatment slag was sulfated and roasted.

[0012] The pretreatment slag (leaching slag) of copper anode slime is sulfated and roasted, and the roasting conditions are: the temperature is 700 o C, the time is 1 hour, the mass ratio of concentrated sulfuric acid above 98% to copper anode slime is 1.5:1. The material after sulfated roasting is added with sodium chloride solution for decoppering, the conditions for decop...

Embodiment 2

[0015] Take 1000 g of copper anode slime containing 7.89 wt% Te, the particle size is 100% less than 200 mesh, and the pretreatment temperature is 95 o C, the leaching solution is a mixed solution of 100 g / L sodium chloride, 100 g / L hydrochloric acid and 400 g / L sulfuric acid, and 7 L / (t copper anode slime) is blown into the air per minute, and the rotation speed of the stirring paddle is 600 r / Min, liquid-solid ratio 4:1, react for 2 hours, then carry out solid-liquid separation to obtain pretreatment liquid and pretreatment slag (leaching slag), and pretreatment slag is sulfated and roasted.

[0016] The pretreatment slag (leaching slag) of copper anode slime is sulfated and roasted, and the roasting conditions are: the temperature is 750 o C, the time is 1 hour, and the mass ratio of concentrated sulfuric acid above 98% to copper anode slime is 1.6:1. Add sodium chloride solution to decopper the material after sulfation roasting, the condition of decopper is: reaction tem...

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Abstract

The invention relates to a method for recycling tellurium from copper anode slime. The method comprises the following steps of: pre-treating copper anode slime in a mixed solution of sodium chloride, hydrochloric acid and sulphuric acid to remove impurities after ore-grinding; obtaining pre-treated solution and pre-treated slag after solid-liquid separation; carrying out sulfating roasting on the pre-treated slag; removing the copper from the roasted pre-treated slag by adopting a sodium chloride solution; obtaining copper-containing lixivium and copper-removed slag after the solid-liquid separation; separating tellurium from the copper-removed slag and obtaining the tellurium-containing lixivium and tellurium-removed slag after the solid-liquid separation; adding concentrated sulphuric acid to the tellurium-containing lixivium to control the final pH to 6-8; and obtaining the crude tellurium dioxide after neutralizing the tellurium-containing lixivium. In the conventional sodium hydroxide tellurium-leaching process, the tellurium leaching rate is lower than 60wt% and the tellurium content of the leached residue is bigger than 2.00%; and in the tellurium separating process disclosed by the invention, the tellurium leaching rate is higher than 83wt% and the tellurium content of the leached residue is lower than 1.10%, and so the tellurium leaching rate is high, the production period is short, the process is simple and the treatment cost is low.

Description

technical field [0001] The invention relates to the improvement of the copper anode slime wet treatment process, in particular to a method for recovering tellurium from the copper anode slime. Background technique [0002] Copper anode slime is an electrolytic insoluble substance in the electrolytic refining process of pyro-refined copper, that is, anode copper. Copper anode slime contains many valuable metals, which are important raw materials for the production of gold, silver, selenium, tellurium, etc. Copper anode slime contains about 10~18 wt% Cu, 0.2~1.5wt% Au, 7~12wt% Ag, 1 ~7wt% Se, 3~20wt% Pb, 5~10wt% Se, 6~8wt% Te. At present, there are two main treatment processes for copper anode slime at home and abroad: one is based on fire method, which generally includes: sulfuration roasting, dilute acid decopper, reduction and smelting of noble lead, oxidation and refining of gold and silver alloys, and electrolytic refining of gold and silver. Alloy and other main proces...

Claims

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Application Information

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IPC IPC(8): C01B19/04
Inventor 廖春发李啊林刘德刚焦芸芬
Owner JIANGXI UNIV OF SCI & TECH
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