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SEM Study of Chemical Variations in Western U.S. Fly Ash

Published online by Cambridge University Press:  25 February 2011

Robert J. Tevenson  and
Timothy P. Huber
Robert J. Tevenson
Affiliation:
North Dakota Mining and Mineral Resources Research Institute, University of North Dakota, Grand Forks, ND 58202.
Timothy P. Huber
Affiliation:
North Dakota Mining and Mineral Resources Research Institute, University of North Dakota, Grand Forks, ND 58202.
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Abstract

Scanning electron microscope/electron microprobe chemical analyses of individual grains of several western fly ashes have shown an inter-grain variation in composition for ashes derived from both lignite and subbituminous western coals. SRM 2689 (a Class F fly ash from a bituminous coal) and SRM 2691 (a Class C fly ash from a subbituminous coal) have been included in the study and also show inter-grain chemical variation. A classification scheme of fly ash grain compositions has been developed and has proven to be useful in illustrating the differences and similarities of the ashes. There is a positive correlation, for example, between grains rich in SiO2 and Al2O3 and the Na2O content of the grains in lignite and subbituminous coal derived fly ashes. There is also a positive correlation between grains rich in CaO and the MgO content of the grains in both classes of fly ashes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 86: Symposium N – Fly Ash and Coal Conversion By-Products III , 1986 , 99
Copyright
Copyright © Materials Research Society 1987

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References

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