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Preparation of High Purity Copper by Electrorefining in Nitric Acid System
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Wenming YANG1, Yu WANG2, 3, Jingsong LUO1, 2, Ge DENG1, 2, Yan LIN2, 3, 4, Wenbin ZENG1, 2, Yaling MU1
Hydrometallurgy of China | 2024, 43(3) : 293 - 301
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Hydrometallurgy of China | 2024, 43(3): 293-301
• Experiment Research •
Preparation of High Purity Copper by Electrorefining in Nitric Acid System
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Wenming YANG1, Yu WANG2, 3, Jingsong LUO1, 2, Ge DENG1, 2, Yan LIN2, 3, 4, Wenbin ZENG1, 2, Yaling MU1
Affiliations
  • 1 Southwest Copper Branch, Yunnan Copper Co., Ltd., Kunming 650102, China
  • 2 Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • 3 Yunnan Province China-Lao Energy & Mining Analysis and Technological Innovation International Joint R&D Center, Kunming 650093, China
  • 4 State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China
Published: 2024-06-20 doi: 10.13355/j.cnki.sfyj.2024.03.011
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A new process for preparing high-purity copper by electrorefining in a nitric acid system was developed using a 4N copper cathode as raw material. The effects of electrolyte composition on the content of S, Cl, typical positively charged and negatively charged impurities in copper cathodes were investigated. Moreover, the influence of Cu(NO3)2·3H2O raw material purity, electrolyte components(Cu2+, HNO3 and Cl- mass concentrations), and electrolysis period on copper cathode purity, impurity content, current efficiency, and electrical energy consumption was analyzed. The results show that the optimum process conditions are to prepare the electrolyte using 99% purity of Cu(NO3)2·3H2O, with Cu2+ mass concentration of 50 g/L, HNO3 mass concentration of 31.5 g/L, Cl- mass concentration of 0.1 g/L, and electrolysis period of 72~120 h. Under the optimal conditions, high-purity copper cathode with purity up to 6N5 and main control impurity elements can meet the high purity cathode copper required by HPCu-6N in the national standard (GB/T 26017—2020).

electrorefining  /  high-purity copper  /  nitric acid system  /  electrolyte  /  preparation
Wenming YANG, Yu WANG, Jingsong LUO, Ge DENG, Yan LIN, Wenbin ZENG, Yaling MU. Preparation of High Purity Copper by Electrorefining in Nitric Acid System[J]. Hydrometallurgy of China, 2024 , 43 (3) : 293 -301 . DOI: 10.13355/j.cnki.sfyj.2024.03.011
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Year 2024 volume 43 Issue 3
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doi: 10.13355/j.cnki.sfyj.2024.03.011
  • Receive Date：2024-02-01
  • Online Date：2025-09-10
  • Published：2024-06-20
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  • Received：2024-02-01
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Affiliations
    1 Southwest Copper Branch, Yunnan Copper Co., Ltd., Kunming 650102, China
    2 Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
    3 Yunnan Province China-Lao Energy & Mining Analysis and Technological Innovation International Joint R&D Center, Kunming 650093, China
    4 State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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