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How does limestone rock dust prevent coal dust explosions in coal mines?

Authors
Man-CK; Teacoach-KA
Source
Min Eng 2009 Sep; 61(9):69-73
NIOSHTIC No.
20036253
Abstract
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.
Keywords
Mining-industry; Underground-mining; Coal-mining; Coal-dust; Explosive-dusts; Control-technology
CODEN
MIENAB
Publication Date
20090901
Document Type
Journal Article
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
9
ISSN
0026-5187
NIOSH Division
PRL
Priority Area
Mining
Source Name
Mining Engineering
State
PA
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