Pyrolysis of Technogenic-Redeposited Coal-Bearing Rocks of Spoil Heaps

• Published in: Geosciences (Basel) Vol. 10; no. 4; p. 122
• Main Authors: Akulov, Nikolay I., Akulova, Varvara V.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.04.2020
• Subjects: Accuracy; Aromatic compounds; Aromatic hydrocarbons; Bearing; Chemical composition; Chromatography; Coal; coal basin; Coal mining; coal-bearing rock; Earth science; Enrichment; Epigenetics; Heating; Heterocyclic compounds; High temperature; hydrocarbon compound; Hydrocarbons; Low temperature; Mass spectrometry; Metamorphic rocks; Methods; Minerals; Organosulfur compounds; Polycyclic aromatic hydrocarbons; Pyrolysis; pyrolysis process; Researchers; Resins; Rock masses; Spoil; spoil heap; Sulfur compounds; Sulfur content; Sulphur; Sulphur compounds; Japan
• ISSN: 2076-3263; 2076-3263
• DOI: 10.3390/geosciences10040122

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%.