№62-05

Analysis of the mined coal quality and ways of enhancement it in the Western Donbas mines

D. Malashkevych¹, M. Petlovanyi¹, N. Postol¹, M. Postol¹

¹Dnipro University of Technology, Dnipro, Ukraine

Coll.res.pap.nat.min.univ. 2020, 62:53-64

https://doi.org/10.33271/crpnmu/62.053

Full text (PDF)

ABSTRACT

Purpose. Analysis of the mined coal quality indicators and tendencies of their changes in relation to the parameters of longwall operations in difficult mining and geological conditions of Western Donbas mines.

Methodology. To achieve this goal, statistical data of production and operational ash content in the Western Donbas mines were used. The data of mining and geological forecasts, indicators of working faces and modern mining technical parameters of coal seam development systems achieved in mines were used.

Results. A tendency has been established to increase production volumes and deteriorate indicators of average operational ash content and undercut value, which is due to an increase in the number of commissioning of thin coal seams (less than 1.0 m). The factors influencing the increase in the ash content of mined coal have been substantiated. The influence of the adopted technological scheme of seam extraction and the magnitude of the undercut on the formation of the operational ash content indicator has been investigated. It has been determined that in the geological conditions of the C₉, C₁₀^t and C₁₁ of Heroiv kosmosu mine, the transition of stope faces from gross to selective coal mining will reduce the operational ash content to 22%, 14.8% and 19.3%, respectively, with a sequential seam development scheme.

Original. Trends in the change in the quality indicators of coal produced in the Western Donbas mines are analytically determined and substantiated. The analytical dependences of the change in the operational ash content of the mined coal on the adopted seam development scheme and the magnitude of the undercut in the developed seams of Heroiv kosmosu mine.

Practical implication. The results obtained prove, from a practical point of view, the deterioration of the quality indicators of mined coal, which necessitates the development of new progressive technical solutions for the extraction of clean coal in longwalls with minimization of rock outcrops to the day surface.

Key words: coal seam, mining, production ash content, waste rock, rock cutting, bedrocks, selective coal extraction.

References:

1. Coal Information 2017. (2017). Coal Information
   https://doi.org/10.1787/coal-2017-en
2. Cornot-Gandolphe, S. (2019). Status of Global Coal Markets and Major Demand Trends in Key Regions.
3. Kurs na energonezavisimost': Shakhtery DTEK Energo dobyli bol'she 22 mln tonn uglya za 2019 god. (2020). Retrieved 18 November 2020, from
   https://energo.dtek.com/ru/media-center/press/kurs-na-energonezavisimost-shakhtery-dtek-energo-dobyli-bolshe-22-mln-tonn-uglya-za-2019-god/
4. Baker Tilly. (2013). Retrieved from
   www.bakertilly.ua/media/Baker%20Tilly%20-%20Report_coal_industry_eng.pdf
5. DTEK. Integrirovannyy otchet 2017. Finansovye i nefinansovye rezul'taty (2018). Retrieved from
   https://dtek.com/content/files/dtek_ar_2017_ru1.pdf
6. Denisov, S.L., Mamaykin, A.R., & Yavorskiy, A.V. (2010). Osobennosti otrabotki malomoshchnykh plastov v usloviyakh Zapadnogo Donbassa. Naukovyi visnyk Natsionalnoho hirnychoho universytetu, № 7(8), 18-21.
   http://nv.nmu.org.ua/index.php/ru/sotrudnichestvo/partnery/631-ruscat/arkhiv-zhurnala/2010/soderzhanie-7-8-2010/razrabotka-mestorozhdenij-poleznykh-iskopaemykh/1754-osobennosti-otrabotki-malomoshchnykh-plastov-v-usloviyakh-zapadnogo-donbassa
7. Sotskov, V., Podvyhina, O., Dereviahina, N., & Malashkevych, D. (2018). Substantiating the criteria for applying selective excavation of coal deposits in the Western Donbass. Вісник Дніпропетровського Університету. Геологія, Географія, 26(1), 158-164.
   https://doi.org/10.15421/111817
8. Smirnov, А., & Piliugin, V. (2015). Evolution of modern mining systems of longwall thin flat coal seams. Mining Of Mineral Deposits, 9(1), 7-14.
   https://doi.org/10.15407/mining09.01.007
9. Petlovanyi, M.V., Khalymendyk, O.V. & Sherstiuk Ye.A. (2020). Problemni aspekty vidpratsiuvannia malopotuzhnykh vuhilnykh plastiv zakhidnoho donbasu. Suchasnyi rukh nauky: tezy dop. X mizhnar. nauk.-prakt. konf. (s. 199-204). https://www.researchgate.net/profile/Volodymyr_Parchenko/publication/340619201_Way_Science-2020/links/5e954b5c299bf13079979d11/Way-Science-2020.pdf#page=199
10. Snihur, V., Malashkevych, D., & Vvedenska, T. (2016). Tendencies of coal industry development in Ukraine. Mining Of Mineral Deposits, 10(2), 1-8.
    https://doi.org/10.15407/mining10.02.001
11. Malashkevych, D., Poimanov, S., Shypunov, S., & Yerisov, M. (2020). Comprehensive assessment of the mined coal quality and mining conditions in the Western Donbas mines. E3S Web Of Conferences, 201, 01013.
    https://doi.org/10.1051/e3sconf/202020101013
12. Petlovanyi, M., & Malashkevych, D. (2020). Ecological consequences of underground mining thin coal seams in the Western Donbass. International Scientific Conference: Priority development fields of the European research area, 66-69.
    https://doi:10.30525/978-9934-588-84-6-19
13. Bondarenko, V., Russkikh, V., Malashkevich, D., & Sotskov, V. (2017). Technological scheme and equipment for selective extraction of coal with long clearing faces. Journal of Donetsk mining institute, (2), 19-24.
    https://doi.org/10.31474/1999-981x-2017-2-19-24
14. Byzylo, V., Koshka, O., Poymanov, S., & Malashkevych, D. (2015). Resource-saving technology of selective mining with gob backfilling. New Developments in Mining Engineering 2015, 485-491.
    https://doi.org/10.1201/b19901-84
15. Buzilo, V.I., Koshka, O.H., Yavorsky, A.V., Yavorska, E.A., Tokar, L.A., Sulaev, V.I., & Serdyuk,V.P. (2015). Selective mining technique for thin coal seams. National MiningUniversity.
16. Li, J., Yin, Z., Li, Y., & Li, C. (2019). Waste rock filling in fully mechanized coal mining for goaf-side entry retaining in thin coal seam. Arabian Journal Of Geosciences, 12(16).
    https://doi.org/10.1007/s12517-019-4650-3
17. Bondarenko, V., Ruskykh, V., Yarkovych, A., & Malashkevych, D. (2014). Оn the question of rock leaving in worked-out area of coal mines. Mining Of Mineral Deposits, 8(1), 19-24.
    https://doi.org/10.15407/mining08.01.019
18. Petlevanyy, M.V., & Gayday, A.A. (2017). Analiz nakopychennia i systematyzatsiia porodnykh vidvaliv vuhilnykh shakht, perspektyvy yikh rozrobky. Heotekhnichna mekhanika, (136), 147-158 
    http://dspace.nbuv.gov.ua/bitstream/handle/123456789/158621/14-Petlevany.pdf?sequence=1
19. Dmitrienko, S. A., Kuzub, L. M., & Rudenko, V. N. (2014). O skladirovanii shakhtnoy porody. Ugol' Ukrainy, (7), 35-36
    http://www.irbis-nbuv.gov.ua/cgi-bin/irbis_nbuv/cgiirbis_64.exe?C21COM=2&I21DBN=UJRN&P21DBN=UJRN&IMAGE_FILE_DOWNLOAD=1&Image_file_name=PDF/ugukr_2014_7_11.pdf