Abstract
Self-heating of coal-shales has been reported in some South African coal mines to be one of the causes of spontaneous combustion but not the coal alone. Spontaneous combustion tests were conducted on a series of coal-shale samples collected from affected coal mines using a newly developed liability index referred to as the Wits-CT index. The ash content, volatile matter and the carbon content of the samples were investigated, and their effects towards spontaneous combustion liability were established. The study indicated that as ash content increases, the liability towards spontaneous combustion decreased, while as the volatile matter and carbon content increases, the liability towards spontaneous combustion increased. It was further found that the ash content showed a negative effect on the liability index, while volatile matter and carbon content showed positive effect on the liability index. Coal-shales with low ash content and high volatile matter and carbon content are more likely to be prone to spontaneous combustion.
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References
Akande, J.M., Onifade, M.: Modeling of Okaba underground coal mining ventilation system. Int. J. Eng. Technol. 3(7), 766–772 (2013)
Akande, J.M., Onifade, M., Aladejare, A.E.: Determination of airflow distributions in Okaba underground coal mine. J. Min. World Expr 2(2), 40–45 (2013)
ASTM, D-3174-11. Standard test method for ash in the analysis sample of coal and coke from coal and standard classification of coals by rank. ASTM International, West Conshohocken, PA (2011). www.astm.org
ASTM, D-3175-17. Standard test method for volatile matter in the analysis sample of coal and coke. ASTM International, West Conshohocken, PA (2017). www.astm.org
ASTM, D-3173-17a. Standard test methods for moisture in the analysis sample of coal and coke. ASTM International, West Conshohocken, PA (2017). www.astm.org
Dullien, F.: Porous Media Fluid Transport and Pore Structure, p. 79. Academic Press (1979)
Genc, B., Cook, A.: Spontaneous combustion risk in South African coalfields. J. South. Afr. Inst. Min. Metall. 115, 563–568 (2015)
Genc, B, Onifade. M, and Cook.: A Spontaneous combustion risk on South African coalfields: part 2. In: Proceedings of the 21st International Coal Congress of Turkey ‘ICCET’ April 11–13, 2018, Zonguldak, Turkey, pp. 13–25 (2018)
Gouws, M.J., Wade, L.: The self-heating liability of coal: predictions based on simple indices. Mining Science and Technology 9, 75–80 (1989a)
Gouws, M.J., Wade, L.: The self-heating liability of coal: predictions based on composite indices. Min. Sci. Technol. 9, 81–85 (1989b)
ISO 12902:2001: Determination of total carbon, hydrogen and nitrogen
Kim, A.G., Chaiken, R.F.: Relative self-heating tendencies of coal, carbonaceous shales and coal refuse. In: West Virginia, Paper presented at the 1990 Mining and Reclamation conference and Exhibition, Charleston, West Virginia, pp. 535–542 (1990)
Liu, L., and Zhou. F.B.: A comprehensive hazard evaluation system for spontaneous combustion of coal in underground mining. Int. J. Coal Geol. 82, 27–36 (2010)
Mastalerz, M., Drobniak, A., Hower, J. C., O’keefe, J.M.K.: Spontaneous combustion and coal petrology. In: Stracher, G.B., Sokol, E.E., Prakash, A (eds) Coal and Fires: A Global Perspective. Coal-Geology and Combustion 1, 47–62 (2010)
Onifade, M., Genc, B.: A review of spontaneous combustion studies—South African context. Int. J. Min. Reclam. Environ. 2–17 (2018a)
Onifade, M., Genc, B.: Spontaneous combustion of coals and coal-shales. Int. J. Min. Sci. Technol. (2018b) https://doi.org/10.1016/j.ijmst. 2018.05.013
Onifade, M., Genc, B.: Modelling spontaneous combustion liability of carbonaceous materials. Int. J. Coal Sci. Technol. (2018c). https://doi.org/10.1007/s40789-018-0209-2
Onifade, M., Genc, B.: Prediction of the spontaneous combustion liability of coal and coal-shale using statistical analysis. In: Society of Mining Professors, 6th Regional Conference, March 12–13, Johannesburg, South Africa, 2018, pp. 63–82 (2018d)
Onifade, M., Genc, B.: Establishing relationship between spontaneous combustion liability indices. In: Proceedings of the 21st International Coal Congress of Turkey ‘ICCET’ 11–13 April 2018, Zonguldak, Turkey, 1–11 (2018e)
Onifade, M., Genc, B., Carpede, A.: A new apparatus to establish the spontaneous combustion propensity of coals and coals. Int. J. Min. Sci. Technol. https://doi.org/10.1016/j.ijmst. 2018.05.012 (2018)
Phillips, H., Chabedi, K., Uludag, S.: Best practice guidelines for South African Collieries, 1–129 (2011)
Restuccia, F., Ptak. N., Rein. G.: Self-heating behaviour and ignition of shale rock. Combustion and Flame 176 213–219 (2017)
Rumball, J.A., Thomber, M.R., Davidson. L.R.: Study of chemical reactions leading to spontaneous combustion of pyritic black shale at MT Whaleback, Western Australia. In: Western Australia, Symposia series, Australasian Institute of Mining and Metallurgy, pp. 133–139 (1986)
Stracher, G.B., Taylor, T.P.: Coal fires burning out of control around the world: thermodynamic recipe for environmental catastrophe. Int. J. Coal Geol. 59(1), 7–17 (2004)
Acknowledgements
The authors would like to thank the staff of Glencore and Anglo American coal mines for their help during sample collection. The authors wish to express gratitude to Coaltech and Julian Baring Scholarship Fund (JBSF) for their financial support. The work presented here is part of a Ph.D. research study in the School of Mining Engineering at the University of the Witwatersrand.
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Onifade, M., Genc, B. (2019). Ash, Volatile Matter and Carbon Content Influence on Spontaneous Combustion Liability of Coal-Shales. In: Widzyk-Capehart, E., Hekmat, A., Singhal, R. (eds) Proceedings of the 18th Symposium on Environmental Issues and Waste Management in Energy and Mineral Production. SWEMP 2018. Springer, Cham. https://doi.org/10.1007/978-3-319-99903-6_3
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