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

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 2    February 2016

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Electrochemical behavior of mesh and plate oxide coated anodes during zinc electrowinning
Wei ZHANG1,2, Michael ROBICHAUD2, Edward GHALI2, Georges HOULACHI3

1. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2. Department of Mining, Metallurgy and Material Engineering, Laval University, Ste-Foy, Quebec G1K 7P4, Canada;
3. Hydro-Quebec Research Center, Shawinigan, Quebec G9N 7N5, Canada

Abstract:The catalytic performance of two oxides coated anodes (OCSs) meshes and one OCA plate was investigated in a zinc electrowinning electrolyte at 38 °C. Their electrochemical behaviors were compared with that of a conventional Pb-0.7%Ag alloy anode. Electrochemical measurements such as cyclic voltammetric, galvanostatic, potentiodynamic, open-circuit potential (OCP) and in situ electrochemical noise measurements were considered. After 2 h of OCP test, the linear polarization shows that the corrosion current density of the Ti/(IrO2-Ta2O5) mesh electrode is the lowest (3.37 μA/cm2) among the three OCAs and shows excellent performance. Additionally, after 24 h of galvanostatic polarization at 50 mA/cm2 and 38 °C, the Ti/MnO2 mesh anode has the highest potential (1.799 V), followed by the Ti/(IrO2-Ta2O5) plate (1.775 V) and Ti/(IrO2-Ta2O5) mesh (1.705 V) anodes. After 24 h of galvanostatic polarization followed by 16 h of decay, the linear polarization method confirms the sequence obtained after 2 h of OCP test, and the Ti/(IrO2-Ta2O5) mesh attains the lowest corrosion current density. The Ti/(IrO2-Ta2O5) mesh anode also shows better performance after 24 h of galvanostatic polarization with the overpotential lower than that of the conventional Pb-Ag anode by about 245 mV.

 

Key words: oxides coated anode; mesh; plate; electrochemical measurement; electrochemical behavior

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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