Citation: JIANG Liang-Xing, ZHONG Shui-Ping, LAI Yan-Qing, LV Xiao-Jun, HONG Bo, PENG Hong-Jian, ZHOU Xiang-Yang, LI Jie, LIU Ye-Xiang. Effect of Current Densities on the Electrochemical Behavior of a Flat Plate Pb-Ag Anode for Zinc Electrowinning[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2369-2374. doi: 10.3866/PKU.WHXB20100935 shu

Effect of Current Densities on the Electrochemical Behavior of a Flat Plate Pb-Ag Anode for Zinc Electrowinning

1.
1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China;
2. Zijin Mining Group Co., Ltd., Shanghang 364200, Fujian Province, P. R. China

Received Date: 12 April 2010
Available Online: 27 July 2010
Fund Project: 国家自然科学基金(50954006)资助项目 (50954006)

We studied the anodic potential, corrosion rate, and anodic passive layer of a flat plate Pb-Ag (0.8% (mass fraction, w) anode over a long period of polarization under different current densities. Additionally, the cathode current efficiency and quality of the zinc product in the ZnSO₄-MnSO₄-H₂SO₄ electrolyte were also studied. The morphology of the anodic passive layer was characterized by scanning electron microscopy (SEM). The results show that the current density greatly affects the electrochemical behavior of the anode and the cathode during zinc electrowinning irrespective of Mn²⁺. With an increase in the current density, the anodic potential, corrosion rate, cathode current efficiency, and quantity of anode slime increased while the Pb content in the zinc product decreased. When the current density decreased from 500 to 200 A·m^-2 in the ZnSO₄-MnSO₄-H₂SO₄ electrolyte, the stable anodic potential and the corrosion rate decreased by 64 mV and 40%, respectively. Under a lower current density, the anodic potential stabilizes more easily and the passive layer that forms on the surface of the anode is denser and it adheres better to the base body, which is advantageous for the reduction of the corrosion rate. Therefore, to reduce the anodic potential, corrosion rate, and the quantity of anode slime, increase the cathode current efficiency and quality of zinc product, we suggested that the ideal working condition for zinc electrowinning is a higher cathodic current density and lower anodic current density.
- Zinc electrowinning,
- Current density,
- Pb-Ag anode,
- Anodic potential,
- Corrosion rate
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