Abstract
The paper presents the results of a study of epigenetic changes in technogenic-redeposited coal-bearing rocks of Irkutsk and Kuznetsk coal basin spoil heaps (Russia). Hydrocarbon products formed under high-temperature and low-temperature pyrolysis of coal-bearing rocks were studied by using a chromatography-mass spectrometer GCMS-QP2010NC Plus (made by Shimadzu Company). The average temperature of low-temperature natural pyrolysis does not exceed 120 °C, and its average speed is approximately 2 m/year. In this case, three pyrolysis zones gradually built metamorphic rock mass (from bottom to top) are clearly established: heating (focal) activated and enriched. The average temperature of high-temperature pyrolysis reaches 850 °C, and its average speed is approximately 20 m/year. Unlike low-temperature pyrolysis, high-temperature pyrolysis is accompanied by the presence of two major zones (from bottom to top): pyrogenic (focal) and enriched (coke). The chemical composition of the enriched pyrolysis zone was studied in detail. It has been established that hydrocarbon compounds in samples of the pyrolysis zone are presented by six classes: asphaltic-resinous substances; polycyclic aromatic hydrocarbons, heterocyclic compounds, organic sulphur compounds; pyrolytic hydrocarbon and heavy hydrocarbon residue. Quantitative content of hydrocarbon compounds in the analyzed samples varies from 0.35% to 41.88%.
Highlights
Coal underground mining activities on many coal deposits were accompanied by a technogenic deposit of coal-bearing rocks in the form of spoil heaps
Dozens of spoil heaps occurring in these areas have caused and continue to cause significant harm to the environment, polluting it with hazardous products, formed in the process of epigenesis of coal deposits
The study of epigenetic processes of technogenic-redeposited coal-bearing rocks was conducted both in the field and in laboratory conditions*
Summary
Coal underground mining activities on many coal deposits were accompanied by a technogenic deposit of coal-bearing rocks in the form of spoil heaps. Dozens of spoil heaps occurring in these areas have caused and continue to cause significant harm to the environment, polluting it with hazardous products, formed in the process of epigenesis of coal deposits. Studying the environmental impact of coal dumps has been interesting for a large number of researchers in recent years. It is associated with a constant increase in stockpiled mass [1,2,3,4,5,6]. Dumps of coal-bearing rocks occupy and infect vast areas. They are of interest as a source of secondary mineral raw materials
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