GEOCHEMICAL FORM ANALYSIS OF TITANIUM IN CHELATE-TREATED MUNICIPAL SOLID WASTE INCINERATION FLY ASH PARTICLES EMPLOYING CORRELATION ANALYSIS OF ELEMENTAL DISTRIBUTION LINE PROFILES

Abstract

 A new method to analyze metal species in municipal solid waste incineration (MSWI) fly ash employing correlation analysis of elemental distribution line profiles was investigated. Titanium species in chelatetreated MSWI fly ash were estimated by this method. After treatments of fly ash by leaching experiments with different solvents, it showed that heavy metals were easily observed on semi-soluble and/or insoluble matrix of fly ash particles by SEM-EDX. Correlation analysis of elemental distribution line profiles showed that crystalline titanium species in fly ash were rutile (TiO₂) and/or perovskite (CaTiO₃). They were incorporated in aluminosilicate phase like gehlenite (Ca₂Al₂SiO₇) and amorphous minerals. In addition, some of non-crystalline titanium seems to combine with aluminosilicate. Correlation analysis of elemental distribution line profiles by SEM-EDX could estimate crystalline and non-crystaline titanium species, which could not be indentifed by XRD analysis.