Chlorination-Vaporization Reaction of Pb-Oxychloride in Pyrometallurgical Recycling Process of Dust and Ash

摘要

A molten salt layer composed of PbO-PbCl_2 is formed when the vaporization rate of PbCl_2 is slower than its formation rate. Kinetic analysis has been performed of the chlorination-vaporization reaction of Pb-oxychloride in the pyrometallurgical recycling process of dust and ash. Simulation calculations for the bulk diffusion have been carried out, and also by applying the quasi-steady principle the profiles of relative chemical potentials, compositions, and mass flux across the molten salt as well as the intermediate compound layers of Pb-oxychloride, have been obtained. For the chlorination-vaporization reaction, the effects of temperature and Cl-potential in the gas phase (log(P_(HCl)~2/P_(H_2O))) have been evaluated.