Abstract
Understanding the behavior of heavy metals in an ash melting furnace is important to avoid heavy metal contamination in recycled materials and facilitate the metals' effective recovery. The volatilization behavior of heavy metals is strongly related to distribution of molten salts and slag. This study measured distribution ratios of heavy metals for molten salt and slag as (LM= (mass%M) salt/ (mass%M) slag, M=Pb, Zn) using a hermetic or open cell. Heavy metals were vaporized with an almost fixed distribution between molten salt and slag. Distribution ratios of Pb and Zn decreased with increased basicity of slag. The chlorinated reaction of Pb and Zn by CaCl2 can explain the mechanism of this effect. Total chlorine content in slag increased with increased basicity of slag. This fact is attributable to the exchange reaction between chlorine ion in molten salt and oxygen ion in slag.
