Characterization of the mineralogy and microchemistry of fly ash

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Nucl. Chem. Waste Manage.; (United States)

DOI:https://doi.org/10.1016/0191-815X(85)90082-8· OSTI ID:6170057

Lauf, R J

The microstructures of coal fly ash particles were studied by transmission electron microscopy. Some particles are glassy and microscopically homogeneous; however, most particles examined contained one or more crystalline phases. Frequently, particles contain crystallites of a spinel compound in a glass matrix. It is believed that these crystallites nucleate homogenously during cooling. Particles containing a greater fraction of crystalline material often have a dendritic structure. In principle, it should be possible to calculate solidification rates based on crystallite size or dendrite arm spacings. The distribution of trace elements was studied by thermogravimetric analysis and by studying their partitioning between fly ash and bottom ash. Trace element partitioning was then related to the distribution of particle types observed optically. This analysis indicated that only a few elements are present as volatile species. Many important trace elements appear to be associated with a particular particle type, namely, the ferrospheres. These ash particles have been shown to be the oxidized remains of framboidal pyrite in the feed coal.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, TN
• OSTI ID: 6170057
• Journal Information: Nucl. Chem. Waste Manage.; (United States), Journal Name: Nucl. Chem. Waste Manage.; (United States) Vol. 5:3; ISSN NCWMD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
010800 -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
COAL
COMBUSTION PRODUCTS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
CRYSTALS
DENDRITES
ELECTRON MICROSCOPY
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MICROSCOPY
MICROSTRUCTURE
MINERALOGY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
QUANTITATIVE CHEMICAL ANALYSIS
RESIDUES
SPINELS
STRUCTURAL CHEMICAL ANALYSIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
WASTES