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Article

Characterization of Particle Size and Composition of Respirable Coal Mine Dust

1
Department of Chemical Engineering, Michigan Technological University, Houghton, MI 49931, USA
2
Department of Materials Science and Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City, UT 84112, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Emily Sarver
Minerals 2021, 11(3), 276; https://doi.org/10.3390/min11030276
Received: 7 February 2021 / Revised: 27 February 2021 / Accepted: 2 March 2021 / Published: 8 March 2021
Respirable coal mine dust (RCMD) particles, particularly the nano-sized fraction (<1 μm) of the RCMD if present, can cause severe lung diseases in coal miners. Characterization of both the particle size and chemical composition of such RCMD particles remains a work in progress, in particular, with respect to the nano-sized fraction of RCMD. In this work, various methods were surveyed and used to obtain both the size and chemical composition of RCMD particles, including scanning electron microscopy (SEM), scanning transmission electron microscopy (S-TEM), dynamic light scattering (DLS), and asymmetric flow field-flow fractionation (AsFIFFF). It was found that the micron-sized fraction (>1 μm) of RCMD particles collected at the miner location, from an underground coal mine, contained more coal particles, while those collected at the bolter location contained more rock dust particles. Two image processing procedures were developed to determine the size of individual RCMD particles. The particle size distribution (PSD) results showed that a significant amount (~80% by number) of nano-sized particles were present in the RCMD sample collected in an underground coal mine. The presence of nano-sized RCMD particles was confirmed by bulk sample analysis, using both DLS and AsFIFFF. The mode particle size at the peak frequency of the size distribution was found to be 300–400 nm, which was consistent with the result obtained from SEM analysis. The chemical composition data of the nano-sized RCMD showed that not only diesel particles, but also both coal and rock dust particles were present in the nano-sized fraction of the RCMD. The presence of the nano-sized fraction of RCMD particles may be site and location dependent, and a detailed analysis of the entire size range of RCMD particles in different underground coal mines is needed. View Full-Text
Keywords: respirable coal mine dust; particle size; mineral composition respirable coal mine dust; particle size; mineral composition
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MDPI and ACS Style

Pan, L.; Golden, S.; Assemi, S.; Sime, M.F.; Wang, X.; Gao, Y.; Miller, J. Characterization of Particle Size and Composition of Respirable Coal Mine Dust. Minerals 2021, 11, 276. https://doi.org/10.3390/min11030276

AMA Style

Pan L, Golden S, Assemi S, Sime MF, Wang X, Gao Y, Miller J. Characterization of Particle Size and Composition of Respirable Coal Mine Dust. Minerals. 2021; 11(3):276. https://doi.org/10.3390/min11030276

Chicago/Turabian Style

Pan, Lei, Sean Golden, Shoeleh Assemi, Marc F. Sime, Xuming Wang, Yuesheng Gao, and Jan Miller. 2021. "Characterization of Particle Size and Composition of Respirable Coal Mine Dust" Minerals 11, no. 3: 276. https://doi.org/10.3390/min11030276

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