Separation method of mixed solution containing selenium and tellurium in copper anode mud treatment process

A technology of mixed solution and treatment process, applied in the field of tellurium extraction and selenium, can solve the problems of high content of tellurium in crude selenium, high content of impurity copper in selenium-tellurium alloy, large consumption of reducing agent, etc., and achieve the effect of reducing the content of impurities

Active Publication Date: 2016-01-13
YUNNAN COPPER CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for separating selenium and tellurium mixed solutions in the copper anode slime treatment process, aiming to solve the problem of excessive tellurium in crude selenium in the existing separation technology. Conducive to the subsequent recovery of tellurium, the impurity copper content of selenium tellurium alloy is too high, the consumption of reducing agent is too large, etc.

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  • Separation method of mixed solution containing selenium and tellurium in copper anode mud treatment process

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Embodiment 1

[0027] A mixed solution containing selenium and tellurium, including 22.35g / L selenium, 2.542g / L tellurium, 24.32g / L copper, and 13g / L chloride ion concentration. First supplement the chloride ion concentration to 130g / L, and adopt the method of the present invention to reduce the solution twice. In the first reduction, when the concentration of sulfuric acid is 220g / L, liquid sulfur dioxide is added to reduce the solution. After 3 hours of reaction, the crude selenium and the liquid after the first reduction are produced after plate and frame pressure filtration. The crude selenium contains 75.78% of selenium and contains Tellurium 0.443%, copper 1.121%. Compared with the original process, the average selenium content is 72.041%, the tellurium content is 1.615%, and the copper content is 2.165%, which is significantly improved. In the secondary reduction, continue to add liquid sulfur dioxide and react for 1.4 hours. After the secondary reduction, the selenium-tellurium allo...

Embodiment 2

[0029] A mixed solution containing selenium and tellurium, including 22.35g / L selenium, 2.542g / L tellurium, 24.32g / L copper, and 13g / L chloride ion concentration. First replenish the chloride ion concentration to 120g / L, and adopt the method of the present invention to reduce the solution twice. In the primary reduction, the concentration of sulfuric acid was controlled to be 250g / L, and the solution was reduced by liquid sulfur dioxide. After 4 hours of reaction, the crude selenium and the liquid after primary reduction were produced after plate and frame pressure filtration. The crude selenium contained 76.772% of selenium, containing Tellurium 0.452%, copper 1.006%. Compared with the original process, the average selenium content is 72.041%, the tellurium content is 1.615%, and the copper content is 2.165%, which is significantly improved. In the secondary reduction, continue to add liquid sulfur dioxide and react for 1.3 hours. The selenium-tellurium alloy produced after ...

Embodiment 3

[0031] A mixed solution containing selenium and tellurium, including 22.35g / L selenium, 2.542g / L tellurium, 24.32g / L copper, and 13g / L chloride ion concentration. First replenish the chloride ion concentration to 140g / L, and adopt the method of the present invention to reduce the solution twice. In the primary reduction, the concentration of sulfuric acid is controlled at 240g / L, and the solution is reduced by liquid sulfur dioxide. After 3.2 hours of reaction, the crude selenium and the primary reduction liquid are produced after plate and frame pressure filtration. The crude selenium contains 77.633% of selenium, Contains 0.478% tellurium and 0.993% copper. Compared with the original process, the average selenium content is 72.041%, the tellurium content is 1.615%, and the copper content is 2.165%, which is significantly improved. In the secondary reduction, continue to add liquid sulfur dioxide and react for 1.2 hours. The selenium-tellurium alloy produced after the second...

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Abstract

The invention discloses a separation method of a mixed solution containing selenium and tellurium in a copper anode mud treatment process. The separation method includes two reduction steps: primary reduction and secondary reduction. In a high-acid and high-chloride ion environment, SO2 is employed as a reduction agent to reduce the mixed solution containing selenium and tellurium by two steps, so that the produced crude selenium is increased by 4% in selenium content,is reduced by 72% in tellurium content,and is reduced by 51% in copper impurity content; the selenium-tellurium alloy is increased by 15% in tellurium content and is reduced by 80% in copper impurity. The separation method greatly reduces the impurity content of the product, enables the tellurium to be more concentrated in the selenium-tellurium alloy and is beneficial for follow-up recycling operation.

Description

technical field [0001] The invention relates to the technical field of selenium and tellurium extraction, in particular to a method for separating a mixed solution containing selenium and tellurium in the process of copper anode slime treatment. Background technique [0002] Selenium and tellurium in copper concentrate are enriched in electrolytic refining anode slime during copper smelting. In the combined process of copper anode slime beneficiation and smelting, after copper anode slime is chlorinated, scattered metals such as selenium and tellurium are mixed with Precious metals are separated and enriched in the chlorinated solution, which contains 20-40g / L selenium and 1-3g / L tellurium. In the traditional separation technology, the average selenium content of crude selenium produced is about 75-80%. Contains 1~2% tellurium and 2~3% copper. The selenium-tellurium alloy contains an average of 20-30% selenium, 20-25% tellurium and 25-30% copper. In the existing technology...

Claims

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Application Information

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IPC IPC(8): C01B19/02
Inventor 叶钟林王鹏程代红坤沙梅夏挺郭开师李玉东郑金和
Owner YUNNAN COPPER CO LTD
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