Chemistry, mineralogy and artificial weathering of PFBC by-products
- Ohio State Univ., Columbus, OH (United States). School of Natural Resources
Chemical and mineralogical analyses were performed on spent bed residues and cyclone ashes acquired from the TIDD pressurized fluidized bed combustion (PFBC) demonstration plant operated by American Electric Power in Brilliant, OH. The cyclone ashes were composed of fly ash, dolomite, anhydrite, periclase, and calcite in decreasing order of abundance. By comparison, bed residues contained less dolomite and fly ash but more anhydrite, calcite and periclase. All samples were highly alkaline with past pH values ranging from 9.9 to 12.3. The major element chemistry of the by-products was dominated by Ca, Mg, S, Fe, Al and Si. All materials met the criteria for ceiling concentrations of Cd, Cr, Cu, Pb, Mo, Ni, Se and Zn as defined for land application of sewage sludges. As exceeded the ceiling level in one of six samples. An artificial weathering study was conducted to evaluate the impact of PFBC by-products on water quality in mined land reclamation. The study was performed using two mine spoils mixed with cyclone ash at rates of 0, 10, 20 and 40 wt % by-product. The composition of leachates from the mixtures was mostly a function of rate of by-product application and equilibration time. In general, the addition of PFBC by-product increased pH, conductivity, and the concentrations of dissolved Ca, K, Mg, Mo, Na, S, and Sr whereas the concentrations of Al, Fe, and Mn decreased. Six metals (Ag, As, Ba, Cd, Cr, and Pb) were below concentration levels defined for drinking water standards. No significant alteration of native spoil minerals was observed over the course of the study; however, hydration/precipitation reactions resulted in the rapid formation of gypsum. No evidence of ettringite crystallization was available after 132 days of periodic leaching.
- OSTI ID:
- 257019
- Report Number(s):
- CONF-950952-; TRN: IM9631%%225
- Resource Relation:
- Conference: 12. annual international Pittsburgh coal conference, Pittsburgh, PA (United States), 11-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Twelfth annual international Pittsburgh coal conference: Proceedings. Coal -- Energy and the environment; Chiang, S.H. [ed.]; PB: 1248 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization and laboratory weathering studies
Developing technologies for high-volume land application uses of pressurized fluidized-bed combustion (PFBC) ash
Related Subjects
ASHES
CHEMICAL COMPOSITION
MINERALOGY
WEATHERING
GROUND DISPOSAL
COMBUSTION PRODUCTS
OHIO
FOSSIL-FUEL POWER PLANTS
FLUIDIZED-BED COMBUSTORS
PRESSURIZATION
CALCIUM
MAGNESIUM
SULFUR
IRON
ALUMINIUM
SILICON
CADMIUM
CHROMIUM
COPPER
LEAD
MOLYBDENUM
NICKEL
SELENIUM
ZINC
ARSENIC
ENVIRONMENTAL IMPACTS
LEACHATES
EXPERIMENTAL DATA