The relationship between macerals and sulphur content of some South African Permian coals |
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| Affiliation: | 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, China;2. College of Geoscience and Survey Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;3. Far East Geological Institute, 159 Pr 100-let Vladivostoku, Vladivostok 690022, Russia;4. Engineering School, Far Eastern Federal University, 8, Sukhanova Str., Vladivostok 690950, Russia;5. School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia;6. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;7. School of Marine Sciences University of Haifa, Haifa, Israel;8. Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, USA;1. Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281, Indonesia;2. Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan |
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| Abstract: | There is a positive correlation between sulphur concentration and the vitrinite maceral group content in Permian Vryheid Formation coals in South Africa; the reverse is true for the inertinite maceral family. This relationship is evident at intraseam, interseam and intercoalfied levels. Vitrinite precursors formed where the water table in peat-forming environments was high and Eh low. These conditions favoured bacterial sulphate reduction and resulting H2S reacted with Fe2+ and organic peat compounds to form pyrite and organic sulphur components. Inertinite precursors formed when the water table was low and Eh high; aerobic respiration prevailed and little H2S was produced. Organic sulphur derived from peat-forming plant tissue is dominant in intertinite-rich low-sulphur coal; pyritic sulphur exceeds organic sulphur in high-sulphur coals dur to preferential reaction of H2S with Fe2+. |
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