Abstract
The mechanism for the electrode process that occurs on a molybdenum substrate in LiCl-KCl-PbCl2 and LiCl-KCl-PbCl2-PbO melts depending on the concentration of PbO was investigated over the temperature range of 723–823 K using stationary polarization curves and voltammetry techniques. An increase in the concentration of PbO was found to decrease the diffusion-limiting current density for the recovery of lead, which was identified by the appearance of an additional peak in the voltammograms; it can be explained by a decrease in the concentration of Pb2+ ions decrease due to the formation of Pb2O2+ complex ions in the electrolyte. The evaluation of the equilibrium constant KE and the rate constant of the reaction suggests that this reaction is strongly shifted toward the formation of the Pb2O2+ complex ions. A theoretical polarization curve for the diffusion kinetics was calculated.
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