Geochemistry and mineralogy of fly-ash from the Mae Moh lignite deposit, Thailand
- Univ. of Western Ontario, London, Ontario (Canada). Dept. of Geology
- Univ. of Chaing Mai (Thailand). Dept. of Geology
The concentration of 21 elements in fly ash from three boilers (75 MW, 150 MW, and 300 MW) at the EGAT power plant, Mae Moh, Thailand, were determined by INAA. The concentration of 10 major elements was determined by XRF. As, Co, Cr, Ni, Mo, and Sb generally increase in concentration going from bottom ash (BA) through the sequence of electrostatic precipitator ashes (ESPA) and reach maxima of As (352 ppm), Co (45 ppm), Cr (105 ppm), Mo (32 ppm), Ni (106 ppm), and Sb (15 ppm) in the ESPA. Ce, Cs, Fe, Hf, La, Sc, Ta, Tb, and Yb did not exhibit concentration trends or are variable except in the case of one boiler, which showed an increase going from BA to ESPA. Only Br decreased in composition going from BA to ESPA. Rb, Sm, U, and Th showed marked variation in trends. The major elements identified by EDS were Al, Si, S, K, Ca, Fe, and Ba, with minor amounts of Mg, Na, Ti, Mn, and Sr. Al, Si, K, and Ca occur together and are present in most of the fly-ash particles. Ba was found as a major component with Ca, Al, and Si. Fe and Ca are usually associated with sulfur. Some small spheres (< 5 {mu}m) are comprised almost entirely of Fe (probably as oxide). Symplectite textures are noted in high-Fe phases. All elements except Br are significantly enriched in the fly ash relative to the coal, which contains 35% ash. Particle chemistry is consistent with the major mineral phases identified by XRD, which include: quartz, magnetite, mullite, gehlenite, anorthite, hematite, anhydrite, and clinopyroxene.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 28045
- Report Number(s):
- CONF-9305402-; ISSN 0090-8312; TRN: IM9516%%171
- Journal Information:
- Energy Sources, Vol. 17, Issue 1; Conference: Annual meeting of the Canadian Society of Coal and Organic Petrology, Calgary (Canada), 21-22 May 1993; Other Information: PBD: Jan-Feb 1995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL DEPOSITS
MINERALOGY
GEOCHEMISTRY
THAILAND
FLY ASH
MULTI-ELEMENT ANALYSIS
LIGNITE
FOSSIL-FUEL POWER PLANTS
NEUTRON ACTIVATION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
SCANNING ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY
ARSENIC
COBALT
CHROMIUM
NICKEL
MOLYBDENUM
ANTIMONY
CERIUM
CESIUM
IRON
HAFNIUM
LANTHANUM
SCANDIUM
TANTALUM
TERBIUM
YTTERBIUM
RUBIDIUM
SAMARIUM
URANIUM
THORIUM
ALUMINIUM
SILICON
SULFUR
POTASSIUM
CALCIUM
BARIUM
MAGNESIUM
SODIUM
TITANIUM
MANGANESE
STRONTIUM
BROMINE
ASH CONTENT
X-RAY DIFFRACTION
EXPERIMENTAL DATA