【Paper】
Major Minerals Identification of Precipitations in Stoker Incinerator Facilities
Yu Hara*, Katsumasa Hanno*, Hikotarou Yoda* and Hisashi Nemoto*
* Chiba Prefectural Environmental Research Center,
Waste and Chemicals Division
† Correspondence should be addressed to Yu Hara:
（1-8-8 Iwasaki-Nishi, Ichihara, Chiba, 290-0046 Japan）

Abstract
We have investigated the chemical composition and mineral species of some precipitations and electrostatic precipitator ash from MSW stoker incinerator facilities. Results of this investigation could be made use of for the processing of waste in the dismantling of incinerator facilities. Samples were analyzed using EDXRF method. EDXRF results showed that major elements of samples were Si, Ti, Al, Fe, Mg, Ca, Na, K, S, P, Cl. Mineral species were identified using XRD method and TG-DTA method. Mineral species identified were Anorthite, Gehlenite, Quartz, Hematite, Lime, Portlandite, Hydrocalumite, CaClOH, Ca（ClO）2・4H2O, Halite, Sylvite, Calcite and Anhydrite. In addition, Akermanite, Perovskite, Farringtonite and Mg2P2O7 were presumed to be possible minerals. Sprayed Portlandite was transformed into CaClOH and Ca（ClO）2・4H2O.

Key words: bottom ash, electrostatic precipitator ash, X-ray fluorescence spectrometry, X-ray diffractometry, thermal analysis