Activities of Lead Chloride in Molten PbCl2–KCl–NaCl and PbCl2–KCl–LiCl Ternary Systems

Abstract

AbstractThe vapour pressures of pure PbCl2 and of PbCl2 over the ternary systems PbCl2–KCl–NaCl and PbCl2–KCl–LiCl were measured by a transportation technique over the temperature range 873–1073 K. From the obtained data, PbCl2 activities were calculated. Negative deviation from ideality was observed over a range of compositions in both ternary systems except for the composition region close to the PbCl2–LiCl binary system. Over the temperature range studied, the effect of temperature on the PbCl2 activities in the ternary systems was small. Prediction of activities in ternary systems based on a simple additivity expression of the two binary systems is discussed. The use of these ternary systems as possible electrolytes for the electrowinning of lead is evaluated.