Method for preparing high-purity tellurium by utilizing copper telluride

A technology of high-purity tellurium and copper telluride, applied in the fields of chemistry and metallurgy, can solve problems such as low recovery rate and complex process of high-purity tellurium, and achieve the effects of easy industrialization, mature production equipment, and simple process flow

Inactive Publication Date: 2019-01-01
YUNNAN COPPER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for preparing high-purity tellurium from copper telluride, aiming to solve the problems in the prior art that the process of extracting high-purity tellurium from copper telluride is complex and the recovery rate is low

Method used

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  • Method for preparing high-purity tellurium by utilizing copper telluride
  • Method for preparing high-purity tellurium by utilizing copper telluride

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Copper telluride is oxidized and roasted under the condition of blowing air, the temperature is 400°C, and the roasting time is 3h. The obtained roasting is carried out by wet ball milling, and the tellurium is leached by adding alkali and blowing oxygen. The leaching temperature is 60°C, and the leaching time is 3h. After filtration and Wash to obtain tellurium-containing leaching solution and copper-containing leaching residue; add sodium sulfide to the leaching solution to remove impurities, add 5 g of sodium sulfide per liter of leaching solution, vulcanize at 70°C, and vulcanize for 2 hours; add sulfuric acid to the obtained vulcanized solution to adjust pH 5-6 to obtain Tellurium dioxide is precipitated, stirred and washed by ultrasonic radiation, and then dried to obtain crude tellurium dioxide; calcining crude tellurium dioxide to remove selenium, controlling the calcination temperature at 500°C and time for 3h; adding sodium hydroxide to dissolve the calcined tel...

Embodiment 2

[0041]Copper telluride is oxidized and roasted under the condition of oxygen blowing, the temperature is 450°C, and the roasting time is 2h. The obtained roasting is carried out by wet ball milling, and the tellurium is leached by adding alkali and hydrogen peroxide. The leaching temperature is 50°C, and the leaching time is 4h. After filtration and Wash to obtain tellurium-containing leaching solution and copper-containing leaching slag; add sodium sulfide to the leaching solution to remove impurities, add 8 g of sodium sulfide per liter of leaching solution, vulcanize at 60°C, and vulcanize for 2 hours; add sulfuric acid to the obtained vulcanized solution to adjust the pH to 5-6 to obtain Tellurium dioxide is precipitated, stirred and washed by ultrasonic radiation, and then dried to obtain crude tellurium dioxide; calcining crude tellurium dioxide to remove selenium, controlling the calcination temperature at 550°C and time for 2h; adding sodium hydroxide to dissolve the cal...

Embodiment 3

[0043] The copper telluride is roasted with sodium nitrate under the condition of blowing air, the temperature is 500°C, the roasting time is 2h, and the obtained roasting is carried out by wet ball milling, and the tellurium is leached by adding alkali and sodium chlorate, the leaching temperature is 70°C, and the leaching time is 3h , after filtration and washing, to obtain tellurium-containing leaching solution and copper-containing leaching slag; adding sodium sulfide to the leaching solution to remove impurities, the amount of hydrogen sulfide per liter of leaching solution was 0.3 liters, the sulfidation temperature was 60 ° C, and the sulfidation time was 2 hours; Adjust the pH to 5-6 to obtain tellurium dioxide precipitates, wash with mechanical stirring, and then dry to obtain crude tellurium dioxide; calcining crude tellurium dioxide to remove selenium, control the calcination temperature at 500°C and time for 3h; add sodium hydroxide to dissolve and calcined telluriu...

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Abstract

The invention discloses a method for preparing high-purity tellurium by utilizing copper telluride. The method comprises the following steps: oxidizing and roasting copper telluride, then ball millingcopper telluride, adding an alkaline solution to leach the tellurium, collecting the leaching solution, adding a vulcanizing agent to remove impurities, thus obtaining a post-vulcanization solution,adding acid into the post-vulcanization solution to obtain precipitates, washing and drying the precipitates to obtain crude tellurium dioxide, calcining the crude tellurium dioxide, adding a sodium hydroxide solution, dissolving, and preparing electrolyte; and electrolyzing the electrolyte by controlling an electrolytic voltage and current density to obtain the high-purity tellurium. By adoptingthe method, the problems in the prior art for refining the high-purity tellurium from copper telluride that the process is complicated and the recovery rate is low can be solved.

Description

technical field [0001] The invention relates to the technical fields of chemistry and metallurgy, in particular to a method for preparing high-purity tellurium from copper telluride. Background technique [0002] Copper telluride is a by-product raw material produced in the process of extracting precious metals from copper smelting anode slime, and it is a material with high tellurium content. At present, China is the country that produces the most copper in the world, and produces a large amount of this tellurium-containing material every year. [0003] The current methods for extracting tellurium from this tellurium-containing material are as follows: [0004] Yu Xinkang introduced alkaline leaching under the oxidation condition of copper tellurium slag in "Nonferrous Smelting" No. 3, 1997, in which the concentration of sodium hydroxide is 10%, the ratio of liquid to solid is 10:1, the reaction temperature is 90°C, and the reaction time is 1h; [0005] Wang Jun'e publish...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C01B19/02
CPCC25B1/00C01B19/02
Inventor 罗劲松范兴祥李英伟杨世莹王家和徐刚芳李国旺叶钟林袁杰阿洪忠
Owner YUNNAN COPPER CO LTD
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