Yu Hara*, Kumiko Nemoto*, Masao Nakamura** and Minoru Tamura**

* Waste Research and Imformation Center, Chiba
** Abiko City

+ Correspondence should be addressed to Yu Hara:
(Iwasaki-Nishi 1-8-2 Ichihara city, Chiba, 290-0046 Japan)

Abstract

We have described a chemical composition of metal particles formed in a mixed (bottom/fly) ash surface-melting furnace. These particles were divided into three groups according to particle size. The first group, having mm sized particles, were separated from slag formed by quenching the molten ash with water. The second group, having hundreds [micro]m sized particles, were separated from slag after crushing. The third group, having a few-10[micro]m sized particles, were wrapped in slag or adhered to slag. The major elements of the first group were Fe, (Fe+Cu) by X-ray fluorescence. Metal Fe, metal Cu and (Fe4Cu3) compound were detected in metal particles by X-ray Diffraction. The second and third group were analyzed by an energy dispertive spectrometer. These contained various metal components such as Fe, Cu, Cr, Si, Co, Ni, Zn, Sn, Sb, Pb etc. The dominant particles, consisting of Fe, (Fe+Cu) . (Cr-Fe-Ni), (Fe-Co-Ni), (Fe-Cu-Sn-Sb), (Fe-Sn), (Ti-Sb) and (Pb-O-S-Cl) were detected in some metal particles.

Key words: molten metal, surface-melting furnace, X-ray fluorescence (XRF), X-ray diffraction (XRD), energy dispertive spectrometer (EDS)