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Mining Publication: How Does Limestone Rock Dust Prevent Coal Dust Explosions in Coal Mines?
Keywords: Coal dust Coal mining Explosions Limestone dust Rock dusting
Original creation date: September 2009
Authors: C Man, KA Teacoach
Peer Reviewed Journal Article - September 2009
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20036253
Min Eng 2009 Sep; 61(9):69-73
Coal dust explosions in underground coal mines are prevented by generous application of rock dust (usually limestone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink. To investigate this process in more detail, a number of explosion experiments using various coal dust and limestone rock dust mixes have been carried out at the Lake Lynn Experimental Mine (LLEM). These were conducted in a single entry of about 1600 ft (488m) in length and initiated with a methane gas explosion. A consistent set of post-explosion floor dust samples were taken along the entry after each test. These dust samples have been analyzed in the laboratory using thermogravimetric analysis (TGA) and solubility to determine how the limestone rock dust behaved during the coal dust / rock dust explosions. The preliminary results are reported in this paper and indicate that the chemistry of limestone plays an important role in its capacity to inhibit coal dust explosions. The results also show that it may be possible to estimate the intensity of the explosion using these conventional methods of analysis.
Image of publication How Does Limestone Rock Dust Prevent Coal Dust Explosions in Coal Mines?Peer Reviewed Journal Article - September 2009
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20036253
Min Eng 2009 Sep; 61(9):69-73
See Also
A Centennial of Mine Explosion Prevention Research
Coal Dust Explosibility
Coal Dust Explosibility Meter Evaluation and Recommendations for Application
Determining Flame Travel Measurements from Experimental Coal Dust Explosions
Mitigating Coal Dust Explosions in Modern Underground Coal Mines
Particle Size and Surface Area Effects on Explosibility Using a 20-L Chamber
Post-Explosion Observation of Experimental Mine and Laboratory Coal Dust Explosions
Rock Dusting
Rock Dusting Considerations in Underground Coal Mines
Technology News 515 - Float Coal Dust Explosion Hazards
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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