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| New Process for Purifying Arsenic Removal from Copper Electrorefining Liquid |
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Received:March 10, 2021
Revised:March 22, 2021
Accepted:March 25, 2021
Published Online:June 29, 2021
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| DOI： |
| KeyWord:electrolytic refining; copper refining; electrodeposition; arsenic removal |
| Author | Institution |
| Zhang Tong |
Institute of Process Engineering, Chinese Academy of Sciences |
| Gong Xuzhong |
Institute of Process Engineering, Chinese Academy of Sciences |
| Zhao Lixin |
Tianjin University of Technology |
| Wang Zhi |
Institute of Process Engineering, Chinese Academy of Sciences |
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| Abstract: |
| Arsenic in crude copper is inevitably dissolved in the electrolyte during the process of electrolytic refining copper, which will affect the efficiency of refining copper. Commonly methods, such as extraction and chemical precipitation, were difficult to achieve ideal results in acid copper refining system. Electrodeposition was used mostly in the existing electrolytic refineries. In this process, the concentration of arsenic was reduced by the power consumption. However, the high energy comsumes and low efficiency limit its application. In this work, the deposit of arsenic was fast in 10 g/L copper electrolyte is found by simulating the existing electrodeposition dearsenic process. Combining the characteristics of the existing electrolytic copper refinery, the arsenic removal process is modified to achieve efficient arsenic removal. More importantly, the product is in the form of copper-arsenic alloy which can be sold to balance the cost. Compared with the existing process, the modified process only adds electrolyte adjustment storage tanks between different sections. The rapid electrodeposition removal of arsenic was achieved by balancing the concentration of copper ions in each section electrolyte. Furthermore, the modified process reduces the power consumption and time for arsenic removal. In addition, the content of copper in the electrodeposit product can be as high as about 60%, which is high-quality blister copper. |
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