Method for recycling selenium from copper leached solution

A technology for recovering selenium and solution, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of unfavorable promotion, numerous steps, complicated separation process, etc., and achieve the effect of low concentration of sulfuric acid, simple process and high recovery efficiency

Inactive Publication Date: 2017-10-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has many steps, the separation process is complicated, and it needs to be operated under strong acidity, which is not conducive to popularization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for reclaiming selenium from liquid after copper separation, said method may further comprise the steps:

[0036] (1) After the copper is electrolytically refined, the copper anode slime is processed by sulphating roasting-step-by-step leaching to obtain the liquid after separation of copper; the concentration of sulfuric acid in the liquid after separation of copper is 25g / L, and the concentration of selenium is 0.32g / L;

[0037] (2) With the stainless steel electrode as the working electrode, the coated titanium DSA electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode, jointly form a three-electrode electrolysis device; add thiourea to the copper separation solution obtained in step (1) As electrolyte, the concentration of thiourea is 2mmol / L;

[0038] (3) The electrolysis device formed in step (2) is energized, the control voltage is -0.5V, and electrolysis is carried out at 25° C. for 80 min. During the electrolysis pro...

Embodiment 2

[0041] A method for reclaiming selenium from liquid after copper separation, said method may further comprise the steps:

[0042] (1) After the copper is electrolytically refined, the copper anode slime is processed by sulphating roasting-step-by-step leaching to obtain the liquid after separation of copper; the concentration of sulfuric acid in the liquid after separation of copper is 30g / L, and the concentration of selenium is 0.32g / L;

[0043] (2) With the stainless steel electrode as the working electrode, the coated titanium DSA electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode, jointly form a three-electrode electrolysis device; add thiourea to the copper separation solution obtained in step (1) As electrolyte, the concentration of thiourea is 2mmol / L;

[0044] (3) The electrolysis device formed in step (2) is energized, the control voltage is -0.6V, and electrolysis is carried out at 25° C. for 90 min. During the electrolysis pro...

Embodiment 3

[0047] A method for reclaiming selenium from liquid after copper separation, said method may further comprise the steps:

[0048] (1) After the copper is electrolytically refined, the copper anode slime is processed by sulphating roasting-step-by-step leaching to obtain the liquid after separation of copper; the concentration of sulfuric acid in the liquid after separation of copper is 45g / L, and the concentration of selenium is 0.25g / L;

[0049] (2) The stainless steel electrode is used as the working electrode, and the coated titanium DSA electrode is used as the counter electrode, Hg / Hg 2 Cl 2 The electrode is used as a reference electrode to jointly form a three-electrode electrolysis device; in the liquid after the copper separation that step (1) obtains, add thiourea as an electrolyte, and the concentration of thiourea is 4mmol / L;

[0050] (3) The electrolysis device formed in step (2) is energized, the control voltage is -0.4V, and electrolysis is carried out at 20° ...

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PUM

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Abstract

The invention relates to a method for recovering selenium from a copper-separated liquid. The copper-separated liquid is used as an electrolytic solution for electrolysis, and selenium is obtained at a cathode. The invention realizes the high-efficiency recovery of selenium from the liquid after copper separation by using the electrolysis method, the recovery rate of the selenium is more than 90%, and the recovery efficiency is high, and the recovery can be completed within 10 to 90 minutes. At the same time, the clean recovery of selenium from the solution after copper separation is realized, the concentration of sulfuric acid in the electrolyte is low, and no harmful substances are generated during the recovery process, and the environmental pollution is small. The method provided by the invention has simple process, is easy to operate, can be industrialized and has good application prospects.

Description

technical field [0001] The invention relates to the field of metal recovery by electrodeposition, and relates to a method for recovering selenium from a solution after copper separation. Background technique [0002] Selenium (Se) is a rare element on the earth, the content in the crust is only 0.05×10 -6 , whose abundance by weight is estimated to be only 10 that of the Earth's crust -7 %, so it is usually extremely difficult to form industrial enrichment in nature. Natural selenium is rare, and often coexists with natural sulfur, mainly existing as heavy metal selenides. Selenium is a typical photosensitive semiconductor material, its chemical properties are between metals and non-metals, and it is a typical semi-metal. Selenium has a metallic luster, can conduct electricity and heat, and its conductivity changes sharply with the intensity of light. The chemical properties are similar to sulfur, but its metallicity is stronger than that of sulfur. Its most notable prop...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25C7/06
CPCC25B1/00C25C7/06
Inventor 金伟王云婷郑诗礼苏俊岭
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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