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U.S. federal regulations require that rock dust be applied in all underground areas of a coal mine to mitigate the propagation of a coal dust explosion. Prior to September 2010, U.S. federal regulation ( 30 C.F.R. 75.403 ) mandated that the nation's coal mines maintain a total incombustible content (TIC) of at least 65% in nonreturn entries ...
A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.
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