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Coal dust suspended in air is explosive—coal dust has far more surface area per unit weight than lumps of coal, and is more susceptible to spontaneous combustion. However, five elements are needed for an explosion to occur: oxygen, an ignition source, coal dust, dispersion of the coal dust, and confinement of the dust. [4]
coal dust: 75: The series of coal dust explosions within a mine rocked the close-knit township and was audible as far as 30 kilometres (19 mi) away. Benxihu Colliery explosion: April 26, 1942: Benxi, Liaoning Manchukuo (now China) coal dust and gas: 1,549: 34% of the miners working that day were killed. This is the world's worst-ever coal ...
The presence of coal dust in the air increased the risk of explosion with firedamp and could cause explosions even in the absence of firedamp. The Tyneside coal mines in England had the deadly combination of bituminous coal contaminated with pyrites and there was a great number of deaths in accidents caused by firedamp explosions, including 102 ...
It was shortly before noon March 9, 1976, when an explosion set off by coal dust and gas shook the Scotia Mine, a subsidiary of the Blue Diamond Coal Co. Two days later, another explosion erupted ...
In practice it is defined as the explosive's ability to accomplish what is intended in the way of energy delivery (i.e., fragment projection, air blast, high-velocity jet, underwater shock and bubble energy, etc.). Explosive power or performance is evaluated by a tailored series of tests to assess the material for its intended use.
On December 6, 2011, the MSHA concluded its investigation, deciding that the disaster was an entirely preventable coal dust explosion. It said "the root cause of the tragedy" was "unlawful policies and practices" of the company and issued 369 citations at the same time as the report. [7] [52] [53]
Central Appalachian (CAPP) coal has a high energy content, but it's expensive. That's led to a switch away from the region and an increase in demand for Powder River (PRB) and Illinois Basin coal ...
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]