Preparation and performance of 3D-Pb anodes for nonferrous metals electrowinning in H2SO4 aqueous solution |
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| Affiliation: | 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;1. School of Mining engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Mining Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran;1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, PR China;2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, PR China;3. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, PR China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Zhuzhou Smelter Group Company Limited, Zhuzhou 412004, China;3. Guizhou R&D Center of Titanium Materials Co., Ltd., Zunyi 563004, China;1. Department of Mechanical Engineering, Baoji University of Arts and Science, Shaanxi, Baoji 721013, China;2. Kunming Hendera of Science and Technology Co. Ltd, Kunming, Yunnan 650106, China |
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| 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. |
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| Keywords: | electrochemical deposition 3D-Pb structure growth mechanism oxide layer anodic potential |
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