Pyrite framboids as the source of magnetite spheres in fly ash

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00098a009· OSTI ID:5599380

Lauf, R J; Harris, L A; Rawlston, S S

Fly ash derived from coal with a high sulfur content contains appreciable amounts of magnetite and related spinels, often as individual microspheres. The appearance and the composition of these spheres strongly suggest that they are pseudomorphs after small pyrite clusters (framboids) observed in the feed coal. Furthermore, the spinel particles and the pyrite framboids exhibit nearly identical size distributions. Framboidal pyrite cannot be removed effectively from the coal by washing or magnetic separation because of the fine particle size. It is a source of sulfur emissions and possibly a signficant source of trace elements in the fly ash.

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 5599380
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 16:4; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010900* -- Coal
Lignite
& Peat-- Environmental Aspects
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
COAL
ELECTRON MICROPROBE ANALYSIS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
IRON SULFIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETITE
MATERIALS
MICROANALYSIS
MINERALS
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PYRITE
RESIDUES
SIZE
SPINELS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTES