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Rank and maceral effects on coal dust generation

Journal Article


Abstract


  • Particulate comminution during the sumping stage of a continuous miner is considered as a batch grinding process, which is characterized by the selection-for-breakage and the breakage distribution functions. The selection-for-breakage function is defined as the fraction by weight of particles of size x which are broken per revolution of a grinding machine. The distribution breakage function is defined as the fraction by weight of the broken material which is reduced to less than size y from the original size x (y ≤ x). The size-weight distribution of a batch ground material can be computed from these two functions at any stage of a size reduction process. Experimental work on 21 coal samples of different petrographic and chemical properties ground in a Hardgrove grindability machine to simulate the mechanism of dust generation during the sumping stage of a continuous miner is presented. The experimental data were statistically analyzed to find the effect of macerals and rank of coal on respirable dust generation. There is a significant effect of rank on Hardgrove grindability index. Low and medium volatile coals were found to have high values for the specific rate of breakage distribution. There is also a positive correlation between Hardgrove grindability index and selection-for-breakage function for 16 × 20 U.S. mesh size interval. Results of this study suggest that the continuous miner cutter head characteristics may have to be modified for different coals in order to reduce dust production during the sumping stage. © 1979.

Publication Date


  • 1979

Citation


  • Baafi, E. Y., & Ramani, R. V. (1979). Rank and maceral effects on coal dust generation. International Journal of Rock Mechanics and Mining Sciences and, 16(2), 107-115. doi:10.1016/0148-9062(79)91447-5

Scopus Eid


  • 2-s2.0-0018455169

Start Page


  • 107

End Page


  • 115

Volume


  • 16

Issue


  • 2

Abstract


  • Particulate comminution during the sumping stage of a continuous miner is considered as a batch grinding process, which is characterized by the selection-for-breakage and the breakage distribution functions. The selection-for-breakage function is defined as the fraction by weight of particles of size x which are broken per revolution of a grinding machine. The distribution breakage function is defined as the fraction by weight of the broken material which is reduced to less than size y from the original size x (y ≤ x). The size-weight distribution of a batch ground material can be computed from these two functions at any stage of a size reduction process. Experimental work on 21 coal samples of different petrographic and chemical properties ground in a Hardgrove grindability machine to simulate the mechanism of dust generation during the sumping stage of a continuous miner is presented. The experimental data were statistically analyzed to find the effect of macerals and rank of coal on respirable dust generation. There is a significant effect of rank on Hardgrove grindability index. Low and medium volatile coals were found to have high values for the specific rate of breakage distribution. There is also a positive correlation between Hardgrove grindability index and selection-for-breakage function for 16 × 20 U.S. mesh size interval. Results of this study suggest that the continuous miner cutter head characteristics may have to be modified for different coals in order to reduce dust production during the sumping stage. © 1979.

Publication Date


  • 1979

Citation


  • Baafi, E. Y., & Ramani, R. V. (1979). Rank and maceral effects on coal dust generation. International Journal of Rock Mechanics and Mining Sciences and, 16(2), 107-115. doi:10.1016/0148-9062(79)91447-5

Scopus Eid


  • 2-s2.0-0018455169

Start Page


  • 107

End Page


  • 115

Volume


  • 16

Issue


  • 2