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X-Ray Quantitative Analysis of Coal By The Reference Intensity Method

Published online by Cambridge University Press:  10 January 2013

Briant L. Davis ,
L. Ronald Johnson  and
T. Mebrahtu
Briant L. Davis
Affiliation:
Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, U.S.A.
L. Ronald Johnson
Affiliation:
Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, U.S.A.
T. Mebrahtu
Affiliation:
Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, U.S.A.
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Abstract

Twenty-four coal samples representing the four major rank types were analyzed by the X-ray RIM methodology which includes mass absorption analysis by X-ray transmission and quantitative X-ray powder diffraction. Twenty-three separate mineral species were observed in the samples, many of which could be quantified in the whole coal analysis. Several mineral species at levels of 5 weightpercent or less were observed only in the ashed scans. Some dehydration and reconstitution reactions were observed in the ashing process, including the combination of organically bound alkaline-earth elements and sulfur to form bassanite and magnesium sulfates. Quartz and kaolinite dominated the silicate mineral portion of the mineralogy, whereas calcite and siderite represented the carbonate; pyrite with associated sulfate oxidation products were generally present as well. The X-ray transmission studies were successful in estimating the carbonaceous matter in the whole coal samples and comparison of the chemical oxides derived from the X-ray data with direct analyses from the Penn State data sheets revealed good correlations, although significant departures occurred for some species and a systematic underestimation of aluminum oxide from the X-ray clay peaks was observed. This study suggests that the RIM procedure can be applied to coal mineral and amorphous component analysis on a routine basis.

Type
Research Article
Information
Powder Diffraction , Volume 1 , Issue 3 , September 1986 , pp. 244 - 255
Copyright
Copyright © Cambridge University Press 1986

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