Control of the Dust Explosion Hazard on Coal Mine Shuttle-car Runways.
Nagy-J; Kawenski-EM; Barrett-EA
NTIS: PB 196 600 :16 pages
Large-scale tests in the Bureau of Mines experimental coal mine show that the explosion hazard of coal dust on shuttle-car roadways can be controlled by proper application of water, dry rock dust, a saturated solution of ammonium phosphate, or mixtures of water or the water-phosphate solution with rock dust. The experiments were made with loadings of 1.0 and 5.0 Pounds of mine-size coal dust per linear foot of entry, and with a 3- or 4-inch-thick layer of coal rubble on the floor. The data from the tests with mine-size coal and rubble are comparable. The water contents of the dust loading were determined from samples collected just prior to initiation of a gas-air mixture in an ignition zone at the face. Dust samples were collected 1 inch deep from the coal-rubble deposit. One experiment was made with the dust in the coal rubble bound with latex applied as a water solution by spray. The binding action was inadequate and explosion propagation was obtained.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 196 600