Analysis of particles size distribution characteristics and dust producing rules of coking coal

According to the problems of serious dust harm when coking coal mining operations,taking the coking coal samples from Shandong Luxi Mining Area affected by geogical structure as the studly objects, on the basis of considering the features of primary dust it was obtained that there was a relationship betwee the amount of coking cal dust produced and is uniaxlal comprssive strength by umiaxlal compressiontes . The dust prodiced ate was the bggest from the medium of coal seam affected by degree of coal metamophism and dust produced ate was bggerfrom magmeatic erosion are. The featue paricle size D10 became smll afifced by magmatic erosion and other geological condititons.The gravitydrop test showed that underthe co diion of the same enegythe coking ca dust produced capacity was stronger than comparison bitumincus coal,the percentageof fine paticles of ust was relaed to drop hammer enegy .Acoding tothe above rsutsthe authors poposed the concept of energy producing dust particle size turning poit when the proporion of f aling dust by dfferent hammer gravity were cose at his time paricle sze range was 20.02~34.82 um.The resulis suggsted that ust clustered near the energy producing dust paricle size turning point. The site dustal eatures and sizeanalysis ruies showed that feature paricle size alected by fault and mining cutting pro.ess The dutal sze distrbution near the shearer proved that points of dust lustered near the energy producing dust particle size turning point.