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A method for recovering copper, silver, selenium and tellurium by electrolysis of copper anode slime molten salt

A copper anode slime and molten salt electrolysis technology is applied in the field of metallurgy and chemical industry to achieve the effect of high purity, high metal purity and reduced use

Active Publication Date: 2022-05-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process still uses concentrated acid pretreatment. In addition, the decopper, selenium, and tellurium anode sludge obtained by oxygen pressure leaching still needs a high-temperature reduction process at 800-1200 ° C.

Method used

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  • A method for recovering copper, silver, selenium and tellurium by electrolysis of copper anode slime molten salt
  • A method for recovering copper, silver, selenium and tellurium by electrolysis of copper anode slime molten salt

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Experimental program
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Effect test

Embodiment 1

[0023] Copper anode slime with Cu content of 29.2%, Ag content of 40.8%, Se content of 19.5%, Te content of 7.5%, and other impurity content of 3.0% is pressed on a powder forming tablet press with a pressure of 25MPa. columnar blocks. The columnar block of copper anode slime is placed in a molybdenum mesh basket as the anode, the platinum sheet as the cathode, and the aluminum chloride and sodium chloride eutectic salt as the electrolyte. Under the protection of argon, the temperature was raised to 130°C, and electrolysis was performed at a constant voltage of 0.6V for 60 minutes. After cooling to room temperature, the cathode product was taken out, ultrasonically treated for 10 min, and washed repeatedly with dilute hydrochloric acid and deionized water for 5 times. The electrolytic product is metallic Ag with a purity of 99.96%.

Embodiment 2

[0025] Copper anode slime with Cu content of 29.2%, Ag content of 40.8%, Se content of 19.5%, Te content of 7.5%, and other impurity content of 3.0% is pressed on a powder forming tablet press with a pressure of 25MPa. columnar blocks. The columnar block of copper anode slime is placed in a molybdenum mesh basket as the anode, the platinum sheet as the cathode, and the aluminum chloride and sodium chloride eutectic salt as the electrolyte. Under the protection of argon, the temperature was raised to 130°C, and electrolysis was performed at a constant voltage of 1.0V for 120min. After cooling to room temperature, the cathode product was taken out, ultrasonically treated for 10 min, and washed repeatedly with dilute hydrochloric acid and deionized water for 5 times. The electrolytic product is Cu-Ag alloy, and the mass ratio of each element is 0.41:0.59.

Embodiment 3

[0027] Copper anode slime with Cu content of 29.2%, Ag content of 40.8%, Se content of 19.5%, Te content of 7.5%, and other impurity content of 3.0% is pressed on a powder forming tablet press with a pressure of 25MPa. columnar blocks. The columnar block of copper anode slime is placed in a molybdenum mesh basket as the anode, the platinum sheet as the cathode, and the aluminum chloride and sodium chloride eutectic salt as the electrolyte. Under the protection of argon, the temperature was raised to 130°C, and the electrolysis was performed at a constant voltage of 1.25V for 120min. After cooling to room temperature, the cathode product was taken out, ultrasonically treated for 10 min, and washed repeatedly with dilute hydrochloric acid and deionized water for 5 times. The electrolysis product is Cu-Ag-Se alloy, and the mass ratio of each element is 0.34:0.44:0.22.

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Abstract

The invention relates to a method for recovering copper, silver, selenium and tellurium by electrolysis of copper anode slime molten salt, belonging to the field of metallurgy and chemical industry. The process of recovering copper, silver, selenium and tellurium by molten salt electrolysis of a copper anode slime is as follows: first, the copper anode slime is pretreated to prepare an electrode, and electrolyzed in molten salt at a constant voltage of 0.3 to 1.6V for 30 to 300 minutes. Then the metal obtained by electrochemical deposition is post-treated to recover copper, silver, selenium and tellurium. The molten salt electrolysis method proposed by the invention can recycle copper-containing anode slime, and has the advantages of wide adaptability of raw materials, wide range of molten salt, high purity of refined products, simple post-treatment process, and the like. Most importantly, this method greatly improves the problem of long recycling process in the existing process, and realizes the green and sustainable electrolysis process.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and in particular relates to a method for recovering copper, silver, selenium and tellurium by electrolysis of copper anode slime molten salt. Background technique [0002] Copper anode slime is an impurity by-product produced in the copper electrolytic refining process, rich in copper, silver, selenium, tellurium and other metal elements and their compounds. At present, the recovery of precious metals such as silver and rare metals such as selenium and tellurium in copper anode slime in the world generally adopts a sulfate roasting process, usually mixing sulfuric acid with anode slime, roasting at a certain temperature, and then using SO 2 Reduction, selenium or tellurium with a purity of 98% to 99% is finally obtained. However, due to SO 2 Problems such as pollution, high energy consumption, and large flue gas volume are prominent, which will affect the further development of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
CPCC25C3/36
Inventor 涂继国焦树强常诚
Owner UNIV OF SCI & TECH BEIJING