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Mining Publication: Particle Size and Surface Area Effects on Explosibility Using a 20-L Chamber
Keywords: Coal dust Coal mining Explosions Particle size distribution Regulations 
 Rock dusting
Original creation date: June 2015
Authors: ML Harris, M Sapko, IA Zlochower, I Perera, ES Weiss
Peer Reviewed Journal Article - June 2015
Download PDF Document (1.73 MB)
NIOSHTIC2 Number: 20046504
J Loss Prev Process Ind 2015 Sep; 37:33-38
The Mine Safety and Health Administration (MSHA) specification for rock dust used in underground coal mines, as defined by 30 CFR 75.2, requires 70% of the material to pass through a 200 mesh sieve (< 75 μm). However, in a collection of rock dusts, 47% were found to not meet the criteria. Upon further investigation, it was determined that some of the samples did meet the specification, but were inadequate to render pulverized Pittsburgh coal inert in the National Institute for Occupational Safety and Health (NIOSH) Office of Mine Safety and Health Research (OMSHR) 20-Liter chamber. This paper will examine the particle size distributions, specific surface areas (SSA), and the explosion suppression effectiveness of these rock dusts. It will also discuss related findings from other studies, including full-scale results from work performed at the Lake Lynn Experimental Mine. Further, a minimum SSA for effective rock dust will be suggested.
Cover page for Particle Size and Surface Area Effects on Explosibility Using a 20-L ChamberPeer Reviewed Journal Article - June 2015
Download PDF Document (1.73 MB)
NIOSHTIC2 Number: 20046504
J Loss Prev Process Ind 2015 Sep; 37:33-38
See Also
A Centennial of Mine Explosion Prevention Research
Coal Dust Explosibility
Coal Dust Explosibility Meter Evaluation and Recommendations for Application
How Does Limestone Rock Dust Prevent Coal Dust Explosions in Coal Mines?
Mitigating Coal Dust Explosions in Modern Underground Coal Mines
Post-Explosion Observation of Experimental Mine and Laboratory Coal Dust Explosions
Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways
Rock Dusting
Rock Dusting Considerations in Underground Coal Mines
Technology News 515 - Float Coal Dust Explosion Hazards
Page last reviewed: July 29, 2015
Page last updated: July 29, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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