Research Report on Self-Heating of Coal Wastes
Self-heating of coal waste poses a significant challenge globally due to various factors such as organic matter properties, moisture content, and dump compaction. The oxidation of deposited coal waste can lead to high temperatures and alterations in both organic and mineral components. A classification system for organic particles in coal wastes was developed and tested through Round Robin Exercises, providing valuable insights for researchers and organizations managing coal waste dumps.
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ICCP COMMISSION III Report on Self heating of coal and coal wastes working group 70thICCP Meeting, Brisbane, September 25-26, 2018 Convenors: Magdalena Misz-Kennan (US) Jolanta Kus (BGR) Deolinda Flores (UP)
Classification of organic particles in coal wastes of the 2009, 2010, 2012, 2013, 2015, and 2016 round robin exercises of the ICCP Self-Heating Working Group. M. Misz-Kennana*, J. Kusb, D. Floresc, C. Avilad, Z. B k ne, N. Choudhuryf, K. Christanisg, J.C. Howerh, J.P. Jouberti, A.I. Karayigitj, S. Kalaitzidisg, M. Malechaa, M. Marquesc, P. Martizzik, J. O Keefel, C.Panaitescun, W. Pickelm, G. Predeanun, S. Puszo, J. Ribeiroc, S. Rodriguesp, A. Singhr, I. Su rez-Ruizs, I. S korov t, N. Wagneru, D. ivoti w Self-Heating Working Group, Commission III, ICCP
Abstract Self-heating of coal waste is a major problem in all places around the world where coal was or/and still is exploited. The phenomenon is dependent on many factores such as the properties of organic matter (maceral composition and rank), moistrure and pyrite content, shape of the dump, compaction of wastes. Once deposited, coal waste undergo oxidation that might lead to self-heating that can reach temperatures exceeding 1000 C. During these processes both organic and mineral undergo alteration that are influenced also by the rate of heating and access of air and moisture. The morphological features of organic matter reflect the conditions within the dump. In 2008 an attempt of classification of the morphological forms of organic particles was undertaken within the Self-heating of coal and coal waste Working Group being of the working Groups in Commission III of International Committee for Coal and Organic Petrology (ICCP). In total, through the years 2008-2016, 27 participants were contributing to the Working Group. Regarding the degree of alteration all the particles were divided into unaltered particles (huminite, vitrinite, liptinite, and inertinite), altered particles, and newly formed particles (pyrolytic carbon, bitumen, chars, graphite, and coke). Altered particles were further divided according to optical properties (porous, massive; isotropic, anisotropic). The following specific types of forms were distinguished within altered particles: fractures, fissures, cracks; paler in colour oxidation rims; darker in colour oxidation rims; plasticised edges; bands; devolatilisation pores; paler in colour particles. The classification was tested by during Round Robin Exercises and the obtained results were high. The propoposed classification can be used in research on self-heating coal waste dumps by scientists and various bodies responsible for the dumps. Self-Heating Working Group, Commission III, ICCP
Key words: Coal wastes, self-heating, organic matter, oxidation Introduction Self-Heating Working Group, Commission III, ICCP
Acknowledgements To Jolanta Kus and Deolinda Flores for their help in preparation the Round Robin Exercises and reports To all participants for their time and work in this working group as well as for their comments To Deolinda, Nikki, Ivana, Jim for sending pictures of self- heated particles Self-Heating Working Group, Commission III, ICCP
