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Relationships between electrostatic charging characteristics, moisture content, and airborne dust generation for subbituminous and bituminous coals.

Authors
Page-SJ
Source
Aerosol Sci Tech 2000 Aug; 32(4):249-267
NIOSHTIC No.
20020769
Abstract
Small scale laboratory pulverizing experiments were performed on humidified coal material sieved to size 6.35 mm (0.250 in) and below to eliminate effects due to inherent planes of weakness (cleats or joints). Experimental factors studied include the coal seam proximate analysis constituents, the breakage-in duced electrostatic field of airborne dust, and the specific airborne dust generated. Results of these pulverizing experiments show that only coals below 1-2% air dry loss (ADL) moisture content are in a highly charged state after pulverization and that the amount of charging decreases rapidly with increasing ADL up to 1-2%. This appears to have a direct effect on the specific dust generation characteristics of coals. However, each coal may have its own characteristic dust charge and generation signature. Underground dust samples obtained in coal seams with inherent moisture contents ranging from 0.5 to 4.5% suggest that significant particle agglomeration exists for the 0.5% inherent moisture coal but not the coals with moisture > 1.3% inherent moisture, in agreement with the laboratory tests.
Keywords
Laboratory-testing; Laboratories; Laboratory-equipment; Dust-analysis; Dusts; Underground-mining; Coal-dust; Mining-industry; Mine-shafts
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
ASTYDQ
Publication Date
20000801
Document Type
Journal Article
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0278-6826
NIOSH Division
PRL
Source Name
Aerosol Science and Technology
State
PA
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