title: Leaching for recovery of copper from municipal solid waste incineration fly ash: influence of ash properties and metal speciation.
abstract: Recovery of metals occurring in significant amounts in municipal solid waste incineration fly ash, such as copper, could offer several advantages: a decreased amount of potentially mobile metal compounds going to landfill, saving of natural resources and a monetary value. A combination of leaching and solvent extraction may constitute a feasible recovery path for metals from municipal solid waste incineration fly ash. However, it has been shown that the initial dissolution and leaching is a limiting step in such a recovery process. The work described in this article was focused on elucidating physical and chemical differences between two ash samples with the aim of explaining the differences in copper release from these samples in two leaching methods. The results showed that the chemical speciation is an important factor affecting the release of copper. The occurrence of copper as phosphate or silicate will hinder leaching, while sulphate and chloride will facilitate leaching.
authors.affiliation: Department of Chemical and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden henric.lassesson@chalmers.se.
authors.forename: Henric
authors.initials: H
authors.lastname: Lassesson
authors.affiliation: Recycling and Waste Management, Gothenburg, Sweden Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, Sweden.
authors.forename: Karin Karlfeldt
authors.initials: KK
authors.lastname: Fedje
authors.affiliation: Department of Chemical and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden.
authors.forename: Britt-Marie
authors.initials: BM
authors.lastname: Steenari
mesh_terms: D060729:Coal Ash / Q000032:analysis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D017745:Incineration; D012037:Refuse Disposal; D062611:Solid Waste / Q000032:analysis*
chemical_list: D060729:Coal Ash; D062611:Solid Waste; D003300:Copper
keywords: Municipal solid waste incineration fly ash; X-ray absorption spectroscopy; ash properties; copper speciation; leaching; metal recovery