A KCl–PbCl2 (50.0–50.0 mol %) molten system
was used as an electrolyte for secondary lead refining. As a result,
pure lead and an anode product containing 52.81 mol % Sb, 33.66 mol
% Bi, 7.54 mol % Pb, 3.74 mol % Ag, and 2.24 mol % As were obtained.
Long-term electrochemical refining was found to be possible in the
KCl–PbCl2 electrolyte. Thermal analysis was applied
to determine liquidus temperatures of the KCl–PbCl2 (50.0–50.0 mol %) mixture with the PbO concentration ranging
from 0 to 20 mol %. The temperature dependence of the PbO solubility
in the KCl–PbCl2 (50.0–50.0 mol %) melt was
studied, and the thermodynamic parameters of the PbO solubility were
calculated. Electrical conductivities and densities of oxy-chloride
melts were measured.