Author:
McCarthy G.J.,Johansen D.M.,Steinwand S.J.,Thedchanamoorthy A.
Abstract
AbstractMethods 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.
Publisher
Cambridge University Press (CUP)
Reference18 articles.
1. Methods of Producing Standard X-Ray Diffraction Powder Patterns
2. On the glass present in low-calcium and in high-calcium flyashes
3. McCarthy G.J. and Steinwanci S.J. , The Mineralogy of Low-Rank Coal Ash, in Proc. 13th Biennial Lignite Symposium: Technology and Utilisation of Low-Rank Coals. Jones M.L. , Ed,, DOE/METC-86/6036(Vol.2), 600-608 (1985).
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