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--
- Journal Information:
- Energy Sources, Journal Name: Energy Sources Journal Issue: 1 Vol. 17; ISSN 0090-8312; ISSN EGYSAO
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM
ANTIMONY
ARSENIC
ASH CONTENT
BARIUM
BROMINE
CALCIUM
CERIUM
CESIUM
CHROMIUM
COAL DEPOSITS
COBALT
EXPERIMENTAL DATA
FLY ASH
FOSSIL-FUEL POWER PLANTS
GEOCHEMISTRY
HAFNIUM
IRON
LANTHANUM
LIGNITE
MAGNESIUM
MANGANESE
MINERALOGY
MOLYBDENUM
MULTI-ELEMENT ANALYSIS
NEUTRON ACTIVATION ANALYSIS
NICKEL
POTASSIUM
RUBIDIUM
SAMARIUM
SCANDIUM
SCANNING ELECTRON MICROSCOPY
SILICON
SODIUM
STRONTIUM
SULFUR
TANTALUM
TERBIUM
THAILAND
THORIUM
TITANIUM
URANIUM
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
X-RAY SPECTROSCOPY
YTTERBIUM