Effect of impurities in recycling water on Pb-Ag anode passivation in zinc electrowinning process

• Published in: Transactions of Nonferrous Metals Society of China Vol. 21; no. 7; pp. 1665 - 1672
• Main Authors: LIU, Hui, WANG, Yun-yan, CHAI, Li-yuan, XIAO, Hai-juan, PEI, Fei, SHU, Yu-de
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2011
• Subjects: Anode effect; Electrolytes; Electrowinning; Impurities; Lead (metal); Passivation; Pb-Ag anode; Recycling; recycling water; Zinc; zinc electrowinning process; recycling water; passivation; Pb-Ag anode; impurities; zinc electrowinning process
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(11)60912-6

Effect of impurities in recycling water on Pb-Ag anode passivation in zinc electrowinning process was investigated by linear scan voltammetry. Results show that passivation process would be affected in the presence of Cl − and F − in recycling water. It was highly advantageous to take H 2SO 4 concentration as 180 g/L, Mn 2+ concentration as 3-5 g/L and F − less than 42 mg/L. However, passivation process would not be affected when Cl − concentration was less than 13 mg/L without any other ions, or when mass ratio of Mn 2+ to Cl − existing in electrolyte was 8, where Cl − concentration could reach up to 625 mg/L.