Analysis and characterization of anti-caking additives used in rock dust.

Details

• Personal Author:
  Harris, Marcia L. ; Perera IE ; Sapko, Michael J. ; Zlochower I
• Description:
  Experiments conducted with limestone dusts and dolomitic marble dusts have indicated that when rock dust is wetted and subsequently dried, it becomes a solid, non-dispersible cake. However, in order to be effective, rock dust must be able to disperse as individual particles to inert. To counteract this, rock dust manufacturers created treated rock dusts that will resist caking after moisture exposure. National Institute for Occupational Safety and Health (NIOSH) researchers conducted a series of laboratory-scale experiments on four base rock dusts and their treated counterparts to assess the effectiveness of various anti-caking additives after being exposed to moisture and then dried. The dusts were exposed to moisture using humidity cabinets having a high relative humidity (99% RH) and by also exposing the rock dust bed to water through bottom wicking. The dusts were then evaluated for dispersibility after drying using the NIOSH-designed dust dispersion chamber. The anticaking additives were different concentrations of stearic acid, oleic acid, and xylene-based surfactants. All results were compared to a reference rock dust used to conduct large-scale experiments in the Lake Lynn Laboratory (LLL), Fairchance, PA. When the untreated dusts were dried after exposure to moisture for one day, no dispersion was measured. However, rock dusts treated with anti-caking agents were readily dispersible even after exposure to moisture for six months. This report details the analysis and characterization of anti-caking additives using the NIOSH-designed dispersion chamber and the 20-L explosion test chamber. [Description provided by NIOSH]
• Subjects:
  Acids Dust Humidity Laboratories Mining Occupational Health Particulate Matter Safety Surface-Active Agents Xylenes
• Keywords:
  Author Keywords: Coal Mining; Dust Dispersibility; Explosion Prevention; Particle Size; Treated Rock Dust Dusts; Humidity; Acids; Xylene; Surfactants; Laboratories; Mining; Underground Mining; Coal Mines; Explosion Prevention; Particulates; Particle Size;
• Series:
  Mining Publications
• ISBN:
  9781510884663
• Publisher:
  Curran Associates, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; New York ; OSHA Region 2 ; OSHA Region 3 ; OSHA Region 8 ; 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:
  268-273
• NIOSHTIC Number:
  nn:20057546
• Citation:
  2019 SME Annual Conference & Expo and CMA 121st National Western Mining Conference: Smart Mining: Resources for a Connected World, February 24-27, 2019, Denver, Colorado. Red Hook, NY: Curran Associates, Inc., 2019 Aug; :268-273
• CAS Registry Number:
  Xylene (CAS RN 1330-20-7)
• Federal Fiscal Year:
  2019
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  2019 SME Annual Conference & Expo and CMA 121st National Western Mining Conference: Smart Mining: Resources for a Connected World, February 24-27, 2019, Denver, Colorado
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/247068/cdc_247068_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]