Anode dissolution of double Pb-Sb and Pb-Bi alloys and electrochemical separation of ternary Pb-Sb-Bi alloys in the KCl-PbCl2 melt

摘要

The paper is aimed at the study of the influence of bismuth, antimony, and lead concentrations on the Pb-Bi, Sb-Pb alloys anode dissolution in the equimolar KCl-PbCl2 melt. The process of lead dissolution, which occurs at the potentials close to equilibrium ones, was found to be a basic process up to the definite values of current densities. According to changes in the theoretical and experimental polarization curves, the element concentrations at the liquid anodes surface were evaluated depending on the current load. The electrolytic cell with a bipolar metallic electrode, the electrolytic cell with two anodes and one cathode, and the electrolytic cell with a porous diaphragm were studied. The tests demonstrated that lead is effectively separated from the metal impurities in all constructions under study.