Report of Investigation 9234: Capillary Wetting Response of Coal after Exposure to Ambient Air Atmosphere

Details

• Journal Article:
  MISSING
• Personal Author:
  Kilau, Howard W. ; Pahlman, John E. ; Kilau, Howard W. ; Pahlman, John E.
• Description:
  The U.S. Bureau of Mines examined the wettability of bituminous and subbituminous coals before and after exposure to ambient air atmosphere, as part of an ongoing project investigating the coal- wetting abilities of surfactant solutions intended for the suppression of dust during coal mining operations. Exposure periods were generally 7 days or less, and the changes in wetting response were measured with a capillary penetration apparatus. Wetting solutions tested included a nonionic surfactant, two anionic surfactants, and pure distilled water. After exposure, higher ranked bituminous coals treated with nonionic surfactant solution and pure water showed increased wettability, but lower ranked subbituminous coals showed decreased wettability. With the anionic surfactants, the coals demonstrated opposite responses. The wettability changes appeared to be related to the coal moisture content. These changes may be amplified by specific, but incompletely understood, interactions between surfactant polar groups, absorbed water, and the coal surface. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety
• Source:
  MISSING :27 pages ; MISSING :27 pages
• Series:
  NIOSH Numbered Publications   ; Mining Publications   ; NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations ; Report of Investigations
• Document Type:
  Text
• Genre:
  Report ; Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Pages in Document:
  32 pdf pages
• NIOSHTIC Number:
  nn:10006971
• Federal Fiscal Year:
  1989
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:507057ef8ec9c503428eb421d6e2c9e77ccca90875da4f9cbbea1ff9f082ea891155e2c508f5e947196c72b8ee675fe8e62e00c9f99917618cacb88e61c1a49a
• Download URL:
  https://stacks.cdc.gov/view/cdc/10343/cdc_10343_DS1.pdf
• File Type:
  [PDF - 1.44 MB ]