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The control of coal dust is difficult due to the coal dust being such a fine particle, allowing it to escape and be suspended in the air for a large amount of time. [3] Dust explosion pentagon showing the needed elements for an explosion: Oxygen, Combustible dust, Dispersion of dust, Confinement of dust, and an Ignition Source.
In the coal mining industry, a methane explosion can initiate a coal dust explosion, which can then engulf an entire mine pit. As a precaution, incombustible stone dust may be spread along mine roadways, or stored in trays hanging from the roof, to dilute the coal dust stirred up by a shockwave to the point where it cannot burn. Mines may also ...
On March 25, 1947, the Centralia No. 5 coal mine exploded near the town of Centralia, Illinois, killing 111 people. [1] The Mine Safety and Health Administration of the United States Department of Labor reported the explosion was caused when an underburdened shot or blown-out shot ignited coal dust. The US Department of Labor lists the disaster ...
Coal miners will be better protected from poisonous silica dust that has contributed to the premature deaths of thousands of mine workers from a respiratory ailment commonly known as black lung ...
Rock dust is a pulverized rock, usually limestone, sprayed on walls inside underground coal mines to prevent coal dust explosions. The dust acts as a heat sink, keeps coal dust levels down, and also prevents the incidence of black lung disease. Rock dust has been used since the early 1900s, but technological improvements have occurred. [1]
Ignited methane gas is a common source of explosions in coal mines, which in turn can initiate more extensive coal dust explosions. For this reason, rock dusts such as limestone dust are spread throughout coal mines to diminish the chances of coal dust explosions as well as to limit the extent of potential explosions, in a process known as rock dusting.
The buildup of pressure in the strata can lead to explosions during (or after) the mining process if prevention methods, such as "methane draining", are not taken. [ 58 ] In 2008 James E. Hansen and Pushker Kharecha published a peer-reviewed scientific study analyzing the effect of a coal phase-out on atmospheric CO 2 levels.
Outburst management primarily focuses on the prevention of outbursts by pre-draining the gas from coal seams prior to mining. The aim of gas drainage is to lower the gas content of the seam below a certain threshold value, at which time it is considered safe to mine the seam. [3]