Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 30    No. 2    February 2020

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Preparation and performance of 3D-Pb anodes for nonferrous metals electrowinning in H2SO4 aqueous solution
Xiao-cong ZHONG1,2,3, Bin ZHANG1, Zhen-cong LIN1, Jia-ming LIU1, Yong-min XIE1, Zhi-feng XU1

1. School of Metallurgical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Guangdong Institute of Rare Metals, Guangzhou 510650, China;
3. State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangzhou 510650, China

Abstract:The effects of Pb2+ concentration, current density, deposition time and temperature on Pb deposit structure were investigated. In lower Pb2+ concentration (~0.15 mol/L), carambola-like 3D-Pb structure was constructed, while in higher Pb2+ concentration (≥0.30 mol/L), Pb deposits exhibited pyramid-like structure. Furthermore, the oxide layer and anodic potential of carambola-shaped 3D-Pb (Cara-Pb) and pyramid-shaped 3D-Pb (Pyra-Pb) anodes were investigated and compared with those of fresh Pb anode. After 72 h galvanostatic electrolysis (50 mA/cm2) in 160 g/L H2SO4 solution, the oxide layer on Pyra-Pb was much thicker than that on Cara-Pb and Pb anodes, which remarkably relieved intercrystalline corrosion of the metallic substrate. Additionally, the oxide layer on Pyra-Pb anode presented a larger surface area and higher PbO2 content. Hence, Pyra-Pb anode showed a 40 mV lower anodic potential compared to Cara-Pb and Pb anodes. In sum, Pyra-Pb anode had a potential to decrease energy consumption and prolong the life span of traditional Pb anode.


Key words: electrochemical deposition; 3D-Pb structure; growth mechanism; oxide layer; anodic potential

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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