Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals

Aplicación de espectroscopía Micro-Raman para el análisis cuantitativo de la reflectancia de vitrinita en carbones colombianos de medio y alto rango

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Ruben Dario Urbano-Noguera, M.Sc. (c)
Hugo Armando Estupiñan-Duran, Ph. D.
Gustavo Neira-Arenas, Ph. D.

Abstract

The structural changes and the degree of maturity of three Colombian coals from the Santander and Antioquia provinces were studied using a simple and fast curve fitting method of the RBS parameters (the distance between band G and band D), FWHM - G (total width at half the maximum of the G band) and AR (area of the Raman spectrum), obtained by deconvolution and band resolution of the Micro-Raman spectra. The results were compared by morphological and chemical analysis using a SEM scanning electron microscope coupled with a solid state X - ray EDS detector. A percentage of vitrinite reflectance (% Ro) of 4.3 %, 3.8 % and 0.07 % was obtained, a percentage of carbon by EDS analysis of 91.47 %, 87.78 %, 73.4 %, a morphological description by SEM analysis presenting smooth, rough surfaces and rough-lumpy and pore size between 0.7 µm - 0.8 µm, 1.3 µm - 1.5 µm and 0.2 µm - 0.7 µm for the anthracite, semi-anthracite and bituminous samples, respectively. The results showed that based on this method, it was possible to obtain a model that allows to rapidly analyze and characterize the coal. The results compare very well to those of Colombian coals normalized by other methods to improve the precision of the measurement. The modified method, however, did not offer an appropriate fit for the lower range coal and produced extremely low reflectance values. This effect is possibly related with the molecular structure of organic matter in coal or the presence of fluorescence interference. 

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Author Biographies (SEE)

Ruben Dario Urbano-Noguera, M.Sc. (c), Universidad Nacional de Colombia

Roles: Conceptualización, Metodología, Investigación, Análisis formal, Validación, Escritura - borrador original.

Hugo Armando Estupiñan-Duran, Ph. D., Universidad Nacional de Colombia

Roles: Análisis formal, Validación, Escritura – revisión y edición.

Gustavo Neira-Arenas, Ph. D., Universidad Nacional de Colombia

Roles: Análisis formal, Escritura - revisión y edición.

References (SEE)

[1] Y. Zhang, Z. Li, “Raman spectroscopic study of chemical structure and thermal maturity of vitrinite from a suite of Australia coals,” Fuel, vol. 241, pp. 188-198, 2019. https://doi.org/10.1016/j.fuel.2018.12.037

[2] UPME - MinMinas. "La cadena del carbón". 2012. https://www.anm.gov.co/sites/default/files/DocumentosAnm/carbon.pdf

[3] L. Schernikau, Economics of the International Coal Trade. 2010. 10.1007/978-90-481-9240-3

[4] A. Cardoso, “Valuation Languages Along the Coal Chain From Colombia to the Netherlands and to Turkey,” Ecological Economics, vol. 146, pp. 44-59, 2018. https://doi.org/10.1016/j.ecolecon.2017.09.012

[5] Q. Huang, A. Noble, J. Herbst, R. Honaker, “Liberation and release of rare earth minerals from Middle Kittanning, Fire Clay, and West Kentucky No. 13 coal sources,” Powder Technology, vol. 332, pp. 242-252, 2018. https://doi.org/10.1016/j.powtec.2018.03.063

[6] Q. Huang, D. Talan, J. H. Restrepo, O. J. R. Baena, V. Kecojevic, A. Noble, “Characterization study of rare earths, yttrium, and scandium from various Colombian coal samples and non-coal lithologies,” International Journal of Coal Geology, vol. 209, pp. 14-26, 2019. https://doi.org/10.1016/j.coal.2019.04.008

[7] S. Massari and M. Ruberti, “Rare earth elements as critical raw materials: Focus on international markets and future strategies,” Resources Policy, vol. 38 (1), pp. 36-43, 2013. https://doi.org/10.1016/j.resourpol.2012.07.001

[8] W. Zhang, X. Yang, R. Q. Honaker, “Association characteristic study and preliminary recovery investigation of rare earth elements from Fire Clay seam coal middlings,” Fuel, vol. 215, pp. 551-560, 2018. https://doi.org/10.1016/j.fuel.2017.11.075

[9] S. Dai, D. Ren, C. L. Chou, R. B. Finkelman, V. V. Seredin, Y. Zhou, “Geochemistry of trace elements in Chinese coals: A review of abundances, genetic types, impacts on human health, and industrial utilization,” International Journal of Coal Geology, vol. 94, pp. 3-21, 2012. https://doi.org/10.1016/j.coal.2011.02.003

[10] K. Kavouridis, “Lignite industry in Greece within a world context: Mining, energy supply and environment,” Energy Policy, vol. 36 (4), pp. 1257-1272, 2008. https://doi.org/10.1016/j.enpol.2007.11.017

[11] A. A. Azni, W. A. W. A. K. Ghani, A. Idris, M. F. Z. Ja’afar, M. A. M. Salleh, N. S. Ishak, “Microwave-assisted pyrolysis of EFB-derived biochar as potential renewable solid fuel for power generation: Biochar versus sub-bituminous coal,” Renewable Energy, vol. 142, pp. 123-129, 2019. https://doi.org/10.1016/j.renene.2019.04.035

[12] Y. Huang, N. Wang, Q. Liu, W. Wang, X. Ma, “Co-pyrolysis of bituminous coal and biomass in a pressured fluidized bed,” Chinese Journal of Chemical Engineering, vol. 27 (7), pp. 1666–1673, 2019. https://doi.org/10.1016/j.cjche.2019.03.012

[13] G. S. Simate, N. Maledi, A. Ochieng, S. Ndlovu, J. Zhang, L. F. Walubita, “Coal-based adsorbents for water and wastewater treatment,” Journal Environmental Chemical Engineering, vol. 4 (2), pp. 2291-2312, 2016. https://doi.org/10.1016/j.jece.2016.03.051

[14] R. Hinrichs, M. T. Brown, M. A. Z. Vasconcellos, M. V. Abrashev, W. Kalkreuth, “Simple procedure for an estimation of the coal rank using micro-Raman spectroscopy,” International Journal of Coal Geology, vol. 136, pp. 52-58, 2014. https://doi.org/10.1016/j.coal.2014.10.013

[15] D. G. Henry, I. Jarvis, G. Gillmore, M. Stephenson, "Assessing low-maturity organic matter in shales using Raman spectroscopy: Effects of sample preparation and operating procedure," International Journal of Coal Geology, vol. 191 (15), pp. 135-151, 2018. https://doi.org/10.1016/j.coal.2018.03.005

[16] C. R. Ward, "Analysis, origin and significance of mineral matter in coal: An updated review," International Journal of Coal Geology, vol. 165, pp.1-27, 2016. https://doi.org/10.1016/j.coal.2016.07.014

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