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Studies of the relationship between mineral matter and grinding properties for low-rank coals

Authors
Journal
International Journal of Coal Geology
0166-5162
Publisher
Elsevier
Publication Date
Volume
60
Issue
1
Identifiers
DOI: 10.1016/j.coal.2004.07.001
Keywords
  • Low-Rank Coal
  • Hardgrove Grindability
  • Mineral Matter
  • X-Ray Diffraction
  • Quantitative Analysis
  • Turkey

Abstract

Abstract Investigations into the effects of mineral matter content on Hardgrove Grindability Index (HGI) were carried out on some low-rank Turkish coals. Quantitative X-ray diffraction (XRD) analyses were carried out using an interactive data processing system (SIROQUANT™) based on Rietveld interpretation methods. Selective leaching processes were used to determine the water and acid-soluble contents of coal samples. Among the coal seams tested, the HGI values of Elbistan coal samples presented a large range from 39 to 83, whereas Tufanbeyli coal samples ranged from 48 to 69. Treatment of the coal with water, ammonium acetate, and hydrochloric acid showed that a considerable part of the ash-forming inorganic matter occurs in water-soluble, acid-soluble, or ion-exchangeable form. Grindability tests on samples of varied water and acid-soluble content showed a significant effect of water and acid-soluble contents on HGI.

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