Synthesis of processes for recovering metals from incineration fly ash of municipal solid wastes

Abstract

The purpose of this study is development of separation processes by which metal elements worth using for raw materials of chemicals (for examples Cd, Cu, Mn, Pb, Zn and so on) are recovered from incineration fly ash of municipal solid wastes. Candidate Process (D) evolved out of Candidate Process (C), which was synthesized with a computer-aided procedure. The process consists of addition of Na2S to nitric solution as leachate of the fly ash for forming precipitate of sulfides, and consecutive dissolution of sulfides with dil-H2SO <7 or (NH