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X-Ray Diffraction Analysis of Fly ASH

Published online by Cambridge University Press:  06 March 2019

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

Methods for, and results from, x-ray diffraction analysis of large numbers of fly ash samples obtained from U.S. power plants are described. Qualitative XRD indicates that low-calcium/Class F fly ash (usually derived from bituminous coal) consists typically of the crystalline phases quartz, mullite, hematite and magnetite in a matrix of aluminosilicate glass. Highcalcium fly ash (derived from low-rank coal) has a much more complex assemblage of crystalline phases that typically includes these four phases plus lime, periclase, anhydrite, alkali sulfates, tricalcium aluminate, dicalcium silicate, melilite, merwinlte and a sodalite-structure phase. Glass compositions among the particles are more heterogeneous and range from calcium aluminate to sodium calcium aluminosilicate, Every ash studied Is mixed with an internal Intensity standard (rutile) so that Intensity ratios can be used to make comparisons of the relative amounts of crystalline phases. An error analysis was performed to define the level of uncertainty in making these comparisons. These intensity ratios will be used for quantitative XRD phase analyses when reference intensity ratios for each fly ash phase become available.

Information

Type
IV. Quantitative and Qualitative XRD Phase Analysis
Information
Advances in X-Ray Analysis , Volume 31: Thirty-Sixth Annual Conference on Applications of X-ray Analysis, August 3-7, 1987 , 1987, pp. 331 - 342
Copyright
Copyright © International Centre for Diffraction Data 1987

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References

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