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| Preparation and electrochemical properties of Pb-Ag/MnO2 anode and cleaning application of zinc electrodeposition |
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Received:April 25, 2024
Revised:May 14, 2024
Accepted:May 23, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:zinc electrowinning; Pb-Ag anode; MnO2 coating; oxygen evolution activity; corrosion resistance |
| Author | Institution |
| Li Chuanbin |
National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals, GRINM Group Corporation Limited, Beijing |
| Jiang honlin |
National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals, GRINM Group Corporation Limited |
| Tian Lin |
National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals, GRINM Group Corporation Limited, Beijing |
| Yuan Xuetao |
National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals, GRINM Group Corporation Limited, Beijing |
| Hu zhifang |
National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals, GRINM Group Corporation Limited, Beijing |
| Yinyanxi |
GRINM Resources and Environment Tech. Co., Ltd |
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| Abstract: |
| Lead-silver alloy (Pb-Ag) is the most widely used anode material in zinc electrowinning and other metallurgical processes. With the gradual increase of energy saving and environmental protection requirements, it is difficult to apply Pb-Ag anode to the development of green industrial system due to the disadvantages of low overpotential and poor stability. How to enhance its oxygen evolution catalytic activity, reduce energy consumption and improve its corrosion resistance has become an urgent industrial problem to be solved. In this paper, a thin film coating of manganese dioxide nanoparticles was prepared on Pb-Ag anode by constant current electrodeposition, and the organization and electrochemical properties of the anode were tested. It was shown that the loose crack structure on the surface of the MnO2 coating not only improved the catalytic activity but also promoted the mass transfer process, which made the oxygen precipitation reaction activity and stability of the Pb-Ag/MnO2 anode better than that of the Pb-Ag anode. Among them, the oxygen evolution overpotential of the Pb-Ag/MnO2 anode was 555 mV, and the Tafel slope was 208.5 mV/dec, which was superior to the oxygen evolution overpotential and Tafel slope of the Pb-Ag anode. Meanwhile, the Pb-Ag/MnO2 anode showed good oxygen precipitation reaction activity and corrosion resistance in the long-cycle zinc electrolysis experiments, and its tank voltage was about 0.1 V smaller than that of the Pb-Ag anode, the energy consumption was lower than that of the Pb-Ag anode. |
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