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VARIATION OF ELEMENT SPECIATION IN COAL COMBUSTION AEROSOLS WITH PARTICLE SIZE
Citation:
HUGGINS, F. E., G. P. HUFFMAN, W. P. LINAK, AND J. YOO. VARIATION OF ELEMENT SPECIATION IN COAL COMBUSTION AEROSOLS WITH PARTICLE SIZE. In Proceedings, 2007 International Conference on Coal Science and Technology, Univ. of Nottingham, UK, August 28 - 31, 2007. University of Nottingham, Nottingham, Uk, NA, (2007).
Impact/Purpose:
Conference paper
Description:
The speciation of sulfur, iron and key trace elements (Cr, As, Se, Zn) in combustion ash aerosols has been examined as a function of size from experimental combustion units burning Utah and Illinois bituminous coals. Although predominantly present as sulfate, sulfur was also present in organosulfur (thiophenic) forms. The relative amounts of sulfate and organosulfur forms correlated with the carbon contents of the different fractions. The iron speciation for the Utah samples changed from ferric oxide forms (Magnetite, minor hematite, and Ca ferrite) and minor Fe3+ in glass in the coarse fraction to mostly small-particle oxide (maghemite) in the ultrafine fraction. Arsenic was present in arsenate forms in all fractions examined, whereas Se was present as selenite in ultrafine fractions but increasingly as selenate in the coarser fractions. Zinc varied from predominantly sulfate forms in the ultrafine fraction to oxide forms in the coarser fraction. Chromium varied significantly among the fractions but remained predomiantly as Cr3+ in all fractions.