Mechanism of Regrinding in Rotary Cutting Machines

Details

• Personal Author:
  Khair AW ; Xu D
• Description:
  This paper presents an analysis of mechanism of secondary fragmentation and respirable dust generation due to regrinding. In continuous miners, the recovered coal and uncleaned coal from the previous cutting cycle have to be transported through the circumference of the cutting drum, subjecting the coal to regrinding. Such regrinding comminutes the coal material utilizing kinetic energy, thus creating a great amount of respirable dust. The mechanism of a single particle subjected to regrinding is analyzed. A mathematical model is developed to describe regrinding in field conditions. The important factors influencing the comminution process are discussed in detail. Utilizing three types of coal seams, laboratory experiments are being carried out with an Automated Rotary Coal Cutting Simulator (ARCCS) to quantitatively evaluate the effects of some particular parameters, such as cutting velocity, depth of sump and properties of coal material, on breakage and on the amount of respirable dust generated. An orthogonal fractional factorial experimental arrangement is used to optimize experimental design. Preliminary experimental results are presented. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Dust Mining Occupational Health Safety
• Keywords:
  Coal Mines Coal Mining Continuous Mining Mathematical Models Mining Equipment Mining Industry Respirable Dust Underground Mines Underground Mining
• Series:
  Mining Publications
• ISBN:
  9780873350983
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 3 ; OSHA Region 8 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  329-337
• NIOSHTIC Number:
  nn:20049434
• Citation:
  Respirable dust in the mineral industries, proceedings of the 3rd symposium on respirable dust in the mineral industries, October 17-19, 1990, Pittsburgh, Pennsylvania. Frantz RL, Ramani RV, eds. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 1991 Jan; :329-337
• Contact Point Address:
  A. W. Khair, Department of Mining Engineering, West Virginia University, WV
• Editor(s):
  Frantz RL; Ramani RV
• Federal Fiscal Year:
  1991
• Performing Organization:
  West Virginia University
• Peer Reviewed:
  False
• Source Full Name:
  Respirable dust in the mineral industries, proceedings of the 3rd symposium on respirable dust in the mineral industries, October 17-19, 1990, Pittsburgh, Pennsylvania
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c81899ad3423b9afe4f766a48108db7d1891a64931885dacfca3cf0acb03e5145d7b955ca5712f78478f63380572ca78a35d7adeeaf6a9f4314d30ba9235337a
• Download URL:
  https://stacks.cdc.gov/view/cdc/228377/cdc_228377_DS1.pdf
• File Type:
  [PDF - 10.30 MB ]