Micro- and nano-chemical characterization of fly ash particles

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dc.contributor.authorCarleton, LEen_AU
dc.contributor.authorGieré, Ren_AU
dc.contributor.authorLumpkin, GRen_AU
dc.date.accessioned2023-01-13T01:20:31Zen_AU
dc.date.available2023-01-13T01:20:31Zen_AU
dc.date.issued2002-10-28en_AU
dc.date.statistics2022-10-19en_AU
dc.description.abstractFly ash from a coal-fired power plant was investigated to gain an understanding of potential environmental and health impacts associated with its emission as aerosols into the atmosphere. The studied ash, produced by combustion of bituminous coal, contains as main chemical components: SiO2 (51.4 wt%), Al2O3 (22.1 wt%) and Fe2O3 (17.2 wt%), and has a mean particle size of 12 micrometers. Only 10% of ash is larger than 45 micrometers, therefore, much of the ash particulate is in the respirable range (<10 µm). The small size of the ash particles makes it necessary to use scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and analytical transmission electron microscopy (AEM) to study the physical and chemical properties of the individual ash particles. The measured weight content of magnetic particles is about 10%. X-ray diffractometry revealed that the magnetic fraction consists mainly of hematite and magnetite, while the nonmagnetic portion is composed of glass, quartz, and mullite. Individual fly ash particles were characterized quantitatively by EPMA and AEM in order to determine their trace and major element contents. In addition to hematite and magnetite, which usually occur as cracked crystalline spherical particles, the magnetic fraction also contains a small amount of Fe-rich glass (Fe2O3 16 wt%). This glass appears mainly as homogenous solid spheres which sometimes have an Al-rich rim. The nonmagnetic glass has a variable composition of mainly Al2O3 and SiO2, is Fe-poor (Fe < 9 wt%) with generally low concentrations of Ca. The glass spheres also have variable physical attributes; some are solid others hollow. It is common for spheres to contain many tiny spheres or have an extremely Al-rich core. Ca-rich crystals, including lime, were also identified in the nonmagnetic fraction of the ash. Up to five percent of ash may be emitted as aerosol into the atmosphere. As commonly observed, many toxic elements and heavy metals are highly enriched in the fly ash relative to the original coal, with the smallest particles being the most enriched. The microscopic size and large physical and chemical variations of fly ash particles make the combination of EPMA and TEM a very powerful approach to help determine the environmental hazard posed by this ash. © 2002 The Geological Society of Americaen_AU
dc.identifier.booktitleGeological Society of America, 2002 annual meeting, abstracts with programsen_AU
dc.identifier.citationCarleton, L. E., Gieré, R., & Lumpkin, G. R. (2002). Micro-and nano-chemical characterization of fly ash particles. Poster presented at the Geological Society of America, 2002 Annual Meeting, Denver, Colorado, USA, October 27-30 2002. In Geological Society of America, 2002 annual meeting, abstracts with programs, Vol. 34, No. 6, (pp. 190). Retrieved from: https://gsa.confex.com/gsa/2002AM/webprogram/Paper39074.htmlen_AU
dc.identifier.conferenceenddate30 October 2002en_AU
dc.identifier.conferencenameGeological Society of America, 2002 Annual Meetingen_AU
dc.identifier.conferenceplaceDenver, Coloradoen_AU
dc.identifier.conferencestartdate27 October 2002en_AU
dc.identifier.issue6en_AU
dc.identifier.otherPaper 39074en_AU
dc.identifier.otherSession No. 83--Booth# 19en_AU
dc.identifier.pagination190en_AU
dc.identifier.urihttps://gsa.confex.com/gsa/2002AM/webprogram/Paper39074.htmlen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14341en_AU
dc.identifier.volume34en_AU
dc.language.isoenen_AU
dc.publisherGeological Society of Americaen_AU
dc.subjectFly ashen_AU
dc.subjectNanochemistryen_AU
dc.subjectParticlesen_AU
dc.subjectScanning electron microscopyen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectAerosolsen_AU
dc.titleMicro- and nano-chemical characterization of fly ash particlesen_AU
dc.typeConference Posteren_AU
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