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Coal dust particle size survey of US mines

By Michael J. Sapko, Kenneth L. Cashdollar and Gregory M. Green


wnductod a joint ~urveyto determine the range of coal particle sizes found in dust samples collected from intake airnap of US coal h.The last comprehensivesurvey of this type was p erfad in the 1920s. The size of the cod dust is dmnt to tbe amount of rwk dust required to inert the coal dust, with more rock dust needed to inert her sks of coal dust. Dust sampl#rwere collected by MSHA inspectors from 9cveral mines in each of MSHA's 10 bituminous Coal Mine Safety and Health Districts. Sampla wtre normally wUected in several intaka at each mint. The laboratory analysis procedure3 included acid leaching of tk sample to remove the limestom rock dust, sonic sieving todeterminethe dust size, and low-temperaWcarhing of the idfractions to mrrect for any remaining incornbustiblc matter. The results indicate that particle s ks of mine coal dust in intake airways are finer than tholt meaeud in the 19209. T bfiner size coal dust in intake airways would require more incombustible matter to bF dFtctivcly inertsd than the 65 % incombustible spifmi in cumt regulations. &yw&: Cool; Mine; pus ^ Panick ExploSh regulation also requires an additional 1.0 % incombustible by weight for each 0.1 % methane in the ventilating air in Despite the worldwide research on coal mine safety. coal intakes and 0.4%additional incombustible for each 0.1% mine explosions involving fatalities and injuries still mur. methane in returns. Experimental studi~by the Pittsburgh Restarch Eabora- Thc 65 % total incombustible content (TIC) required fo

Year: 2011
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