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Characterization of North American Lignite Fly Ashes II. XRD Mineralogy

Published online by Cambridge University Press:  21 February 2011

G. J. McCarthy ,
D. M. Johansen ,
A. Thedchanamoorthy ,
S. J. Steinwand  and
K. D. Swanson
G. J. McCarthy
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
D. M. Johansen
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
A. Thedchanamoorthy
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
S. J. Steinwand
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
K. D. Swanson
Affiliation:
Department of Chemistry, North Dakota State University, Fargo, ND 58105
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Abstract

X-ray powder diffraction has been used to determine the crystalline phase mineralogy in samples of fly ash from each of the lignite mining areas of North America. The characteristic phases of North Dakota lignite fly ashes were periclase, lime, merwinite and the sulfate phases anhydrite, thenardite and a sodalite-structure phase. Mullite was absent in these low-Al2O3 ashes. Montana lignite ash mineralogy had characteristics of ND lignite and MT subbituminous coal fly ashes; mullite and C3A were present and the alkali sulfates were absent. Texas and Louisiana lignite fly ashes had the characteristic mineralogy of bituminous coal fly ash: quartz, mullite, ferrite-spinel (magnetite) and minor hematite. Even though their analytical CaO contents were 7–14%, all but one lacked crystalline CaO-containing phases. Lignite fly ashes from Saskatchewan were generally the least crystalline of those studied and had a mineralogy consisting of quartz, mullite, ferrite spinel and periclase. Quantitative XRD data were obtained. The position of the diffuse scattering maximum in the x-ray diffractograms was indicative of the glass composition of the lignite fly ash.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 113: Symposium Q – Fly Ash and Coal Conversion By-Products IV , 1987 , 99
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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