Rockdust
Rock dustis apulverizedrock, usuallylimestone,sprayed on walls inside undergroundcoal minesto preventcoal dust explosions.The dust acts as a heat sink, keepscoal dustlevels down, and also prevents the incidence ofblack lung disease.Rock dust has been used since the early 1900s, but there have been technological improvements since then.[1]
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 regulation30 CFR75.403mandated that the nation’s coal mines maintain a total incombustible content (TIC) of at least 65% in nonreturn entries and at least 80% in the return airways. In September 2010, the U.S.Mine Safety and Heath Administration(MSHA) published an emergency temporary standard increasing the total incombustible requirement in intake airways to 80%, effective June 21, 2011. The 65% TIC requirement was based on an average particle size termed "mine-size dust," which was based on an average of representative samples collected from mines in the 1920s. To determine compliance with the federal regulation, mine inspectors systematically collect dust samples from sections of underground coal mines and send the samples to the MSHANational Air and Dust LaboratoryatMount Hope, West Virginia,for analysis of incombustible content.[2]
References
[edit]- ^Harteis, SP; Alexander, DW; Harris, ML; Sapko, M; Weiss, ES (1 November 2016)."Review of Rock Dusting Practices in Underground Coal Mines".U.S. National Institute for Occupational Safety and Health.Retrieved11 March2019.
- ^Harris, Marcia L.; Sapko, Michael J.; Varley, Floyd D.; Weiss, Eric S. (August 2012)."Coal Dust Explosibility Meter Evaluation and Recommendations for Application"(PDF).Centers for Disease Control.Retrieved30 March2019.
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