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Lead Alloy Anodes Used in Zinc Electrowinning The zinc electrowinning process is usually performed at high current densities (450-550 A/cm2), which can result in a high anode potential. Consequently, the anodes stability and the corrosion resistance in acidic solutions are also very important factors for the evaluation of the electrowinning anodes. These properties determine the service life of the anodes, the potential of the cells during the process, and the purity of the metal deposited on the cathode. The lead anode in zinc

Why Cell Potential is Important for Metal Electrowinning? Electrowinning is an important process in the extraction of metals such as nickel, copper, and zinc. Laterite and sulfide ores are the main source of nickel, a significant proportion of this metal is produced through the electrowinning process.   Electrowinning is an electrolytic process in which metallic ions are electrodeposited from solutions on the cathode to produce high purity metals. Approximately 80% of the power requirement for a zinc refinery is consum

Lead Anodes Used for Zinc Electrowinning Zinc electrowinning is the electrodeposition of zinc ions on the cathode, oxygen evolution on the anode, as well as hydrogen evolution on the cathode as a side reaction. This process operates in highly acidic solutions and at high current densities. Conventional lead-based anodes used in zinc electrowinning are associated with high corrosion rates and oxygen evolution overpotential in the electrowinning process. These result in some problems such as Pb contaminating the zinc cathode, shorten

What are the Chemical Reactions in the Copper Electrowinning Process? Copper electrowinning is based on the copper electrolysis principle which uses electrical power to reduce copper ions in solution to the copper metal on the cathode and to oxidize water on the anode in oxygen gas and hydrogen ions. The chemical equation (a) gives the copper electrolysis global chemical reaction. 2H2O + 2CuSO4 = 2Cu0 + O2 + 2H2SO4(a). Copper electrowinning circuit of a plant having L/SX/EW configuration and using permanent cathode technology