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Petrographical and thermo-chemical investigation of some North East Indian high sulphur coals

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Journal of the Geological Society of India

Abstract

The Tertiary North East Indian coals, classified as sub-bituminous rank, have found less industrial application owing to their physico-chemical attributes. These coals are characterized by low ash (<15%), high volatile matter (>35%) and high sulphur (2.9-4.46%). Majority of the sulphur occurs in organic form affixed to the coal matrix owing to marine influence, is difficult to remove. The coal maceral analysis shows the dominance of vitrinite (>75%) with lesser amounts of liptinite and inertinite. Reflectance measurements (Rmax) of these sub-bituminous coals fall in the range of 0.57 to 0.65. In this study, the petrographical (maceral), thermal and other physico-chemical analyses of some low rank Tertiary sub-bituminous coals from north-east India were carried out to assess their potential for combustion, liquefaction and coal bed methane formation. The petrofactor, conversion (%) and oil yield (%), combustion efficiency of the coal samples were determined. The respective linear correlations of conversion (%) of the coals with their vitrinite contents, petrofactor and oil yield values have been discussed. The relative combustion efficiency of the coals was measured from the thermo gravimetric analysis (TGA) of coals. The influence of maceral composition upon gas adsorption characteristics of these high volatile coals showed the increase in methane adsorption with vitrinite enrichment. Both the maceral and mineral matter contents were observed to have important influence on the gas adsorption characteristics.

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Authors and Affiliations

  1. Polymer Petroleum and Coal Chemistry Group (MSTD), CSIR-North East Institute of Science & Technology, Jorhat, 785 006, Assam, India

    Arpita Sharma, Binoy K. Saikia & Bimala P. Baruah

  2. Department of Applied Geology, Gauhati University, Guwahati, 781 014, Assam, India

    Arpita Sharma & Sarat Phukan

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  1. Arpita Sharma
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  2. Binoy K. Saikia
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  3. Sarat Phukan
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  4. Bimala P. Baruah
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Correspondence to Binoy K. Saikia.

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Sharma, A., Saikia, B.K., Phukan, S. et al. Petrographical and thermo-chemical investigation of some North East Indian high sulphur coals. J Geol Soc India 88, 609–619 (2016). https://doi.org/10.1007/s12594-016-0527-1

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  • DOI: https://doi.org/10.1007/s12594-016-0527-1

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