Relationships Between Electrostatic Charging Characteristics, Moisture Content, and Airborne Dust Generation for Subbituminous and Bituminous Coals

Details

• Personal Author:
  Page, Steven J.
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Dust Laboratories Mining Occupational Health Safety
• Keywords:
  Coal Dust Dust Analysis Dusts Laboratory Equipment Laboratory Testing Mine Shafts Mining Industry Underground Mining
• Series:
  Mining Publications
• ISSN:
  0278-6826
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  249-267
• Volume:
  32
• Issue:
  4
• NIOSHTIC Number:
  nn:20020769
• Citation:
  Aerosol Sci Technol 2000 Aug; 32(4):249-267
• Contact Point Address:
  NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• Federal Fiscal Year:
  2000
• Peer Reviewed:
  True
• Source Full Name:
  Aerosol Science and Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:bf3caa1ff8e5aa6d33c20d1dd8f34a0be675105cf86bbcef353e0ebdadedce143e197bedb80db51fbec4af6b7fc5c8f15ffec2e2ca50cc1dde478f358abce785
• Download URL:
  https://stacks.cdc.gov/view/cdc/220411/cdc_220411_DS1.pdf
• File Type:
  [PDF - 318.68 KB ]