title: Influence of ignition process on mineral phase transformation in municipal solid waste incineration (MSWI) fly ash: Implications for estimating loss-on-ignition (LOI).
abstract: This research focused on the mineral phase transformation under varied ignition conditions with the objective of estimating loss-on-ignition (LOI) parameter in municipal solid waste incineration (MSWI) fly ash residues. LOI is commonly used to measure the volatile species, unburned carbon and moisture in the solid materials. There are criteria for LOI measurement in some research fields, while there is no standard protocol for LOI measurement in MSWI fly ash. Using thermogravimetry technique, the ignition condition candidates were proposed at 440/700/900°C for 1 and 2h. Based on X-ray diffractometry results, obvious mineral phase transformation occurred as a function of ignition temperature variation rather than ignition time. Until 440°C, only some minor phases disappeared comparing with the original state. Significant mineral phase transformations of major phases (Ca- and Cl-based minerals) occurred between 440 and 700°C. The mineral phase transformation and the occurrence of newly-formed phases were determined not only by the ignition condition but also by the content of the co-existing components. Mineral phase components rarely changed when ignition temperature rose from 700 to 900°C. Consequently, in order to prevent critical damages to the original mineralogical composition of fly ash, the lowest ignition temperature (440°C) for 2h was suggested as an ideal measurement condition of LOI in MSWI fly ash.
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan. Electronic address: mu-y@doc.kyushu-u.ac.jp.
authors.forename: Yue
authors.initials: Y
authors.lastname: Mu
authors.affiliation: Department of Urban and Environmental Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan.
authors.forename: Amirhomayoun
authors.initials: A
authors.lastname: Saffarzadeh
authors.affiliation: Department of Urban and Environmental Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shimaoka
mesh_terms: D002244:Carbon / Q000737:chemistry; D060729:Coal Ash / Q000737:chemistry*; D006358:Hot Temperature; D017745:Incineration / Q000379:methods*; D008903:Minerals / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis*; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D060729:Coal Ash; D008903:Minerals; D062611:Solid Waste; D002244:Carbon
keywords: Ignition condition; Loss-on-ignition (LOI); MSWI fly ash; Mineral phase transformation