Laboratory Results of Foam Application Testing for Longwall Shield Dust Control in a Simulated Environment

Details

• Personal Author:
  Mazzella A ; Reed, William R. ; Shahan MR ; Zheng Y
• Description:
  There were 37 longwall faces operating in mines in the United States in 2019. The average panel width for these longwalls was approximately 368.5 m (1209 ft). This translates to a range of approximately 170-240 shields per longwall, depending upon the width of shield. The movement of longwall shields is a significant contributor to respirable dust overexposures to longwall operators. Foam is expected to have the potential to reduce this shield dust generation. The foam is applied to the area on the roof between the coal face and the shield tip after the shearer passes. In this study, the longwall shield dust simulator was used to test three foam agents for their ability to control dust from longwall shield movements. Results showed that at low-velocity ventilation (more or less 3.0 m/s (600 fpm)) all foam agents were able to produce dust reduction levels of at least 45%. At high-velocity ventilation (more or less 5.1 m/s (1000 fpm)), the reductions were lower and more variable, ranging from being undeterminable for one foam agent to having 46%-63% reductions for the other two foam agents, with one instance of an increase in dust concentration. Overall, the use of foam agents can provide longwall shield dust control. Important factors are roof coverage and the ability of foam to remain on the roof for extended time periods. [Description provided by NIOSH]
• Subjects:
  Dust Environmental Exposure Mining Occupational Health Risk Assessment Risk Factors Safety Ventilation
• Keywords:
  Author Keywords: Foam Dust Control Environmental Exposure Exposure Levels Longwall Longwall Mining Mining Industry Respirable Dust Risk Factors Shields Silica Dust

  More +
• Series:
  Mining Publications
• ISSN:
  2095-8293
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  217-227
• Volume:
  8
• Issue:
  2
• NIOSHTIC Number:
  nn:20062259
• Citation:
  Int J Coal Sci Technol 2021 Apr; 8(2):217-227
• Contact Point Address:
  W.R. Reed, CDC-NIOSH, Pittsburgh, PA
• Email:
  rreed@cdc.gov
• Federal Fiscal Year:
  2021
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Coal Science & Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6df95ffd1daa55438661ca9a6c3cdd72affb9fe7f9154b4fd66b6f8bff42ff1fc06bd77ba14567670f51937f9e0178370d339a9832d86502b28d455b4481e9f5
• Download URL:
  https://stacks.cdc.gov/view/cdc/215426/cdc_215426_DS1.pdf
• File Type:
  [PDF - 3.38 MB ]