QUANTITATIVE MINERAL MATTER DETERMINATION IN LIGNITES USING X-RAY DLFRACTOMETRY AND POSITION SENSITIVE DETECTOR (XRD-PSD)

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Published: Jan 1, 2004
DOI: https://doi.org/10.12681/bgsg.16737
Σ. Παπαζησίμου
Section of Earth Materials, Department of Geology, University of Patras
Σ. Καλαϊτζίδης
Section of Earth Materials, Department of Geology, University of Patras
Abstract

Thirty lignite samples from western Péloponnèse (Greece) were examined in the Department of Mineralogy, Natural History Museum, London, using an X-Ray Diffractometer equipped with a Position Sensitive Detector (Enraf-Nonius PSD 120). Diffraction patterns acquisition time was only 5 min with the minimum interference of the organic matter. Qualitative and quantitative evaluation of the mineral matter present performed using GUFI5 Enraf-Nonius software and involved a pattern-fit stripping technique. The prevailing minerals in all the studied samples are the mixed layers of illite/smectite, quartz, muscovite and K-feldspars. The weight percentages of the mineral matter as it was calculated from the diffraction patterns display high correlation coefficient (>0.85) with the respective wt.-% of ash in 750°C for most of the samples. The low correlation coefficient (0.65) of some samples may be attributed to the very small size of the mineral crystalline particles and/or the presence of inorganic amorphous phases.

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  • Mineralogy and Crystallography
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