Influence of Fe Ions on Anode Performance and the Mechanism of Action During Copper Electrowinning Process

Abstract

The performance of the anode varies from the impurity ions in the copper electrowinning process. This work focused on the variation of the electrochemical behavior of the Pb-0.06%Ca-1.2%Sn anode as the Fe ions (Fe3+ and/or Fe2+) existed in the electrolyte by electrochemical characterization. During the copper electrowinning process, the variation of the corrosion resistance, catalytic activity, and structural composition of the anode film layer was analyzed in-depth as the presence of Fe ions. The results show that the structure of PbO2 on the surface of the film was changed as Fe ions doped into the anode film, and the oxygen evolution activity of the anode was also improved. However, the corrosion resistance decreased with increasing Fe3+ concentration. Furthermore, the addition of 2 g/L Fe2+ in the electrolyte containing 2 g/L Fe3+ leads to an elevation in the corrosion resistance of anode to some extent and further increases the oxygen evolution activity.

Keywords: Surface reaction, Oxygen evolution reaction, Corrosion resistance, Fe Doping