Slurry transport properties of graded coal waste

Details

• Personal Author:
  Backer, Ronald R. ; Busch, Richard A. ; McKibbin, Robert W.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "The Bureau of Mines conducted laboratory tests to determine the slurry transport and deposition properties of coal waste. A 188.5- Ft pipe test loop was constructed with instruments to measure density, flow, and power and discharge, suction, and differential pressures. A 20-ton sample of western coal waste was crushed and screened to 100 pct minus 1/2 in. Eight loop tests using this graded waste were run at slurry densities ranging from 1.15 (25 Wt- pct solids) to 1.46 (60 wt-pct solids). The resultant friction- pressure gradients ranged from 0.06 to 0.24 Ft of water per foot of 4-in standard steel pipe. Particle-size degradation was significant. In a typical loop test lasting 25 min, the minus 200- mesh fraction increased from 19 pct to 34 pct. Deposition tests showed that without the use of a flocculant, the slurries would not dewater when left to stand for 1 week. With flocculant, additional water was released
  
  however, the settled slurries remained thixotropic. Further testing is necessary to determine their suitability for use as backfill material in active mines." - NIOSHTIC-2
  
  NIOSHTIC no. 10003220
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  26 numbered pages
• NIOSHTIC Number:
  nn:10003220
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b6a478673dc5f0412ff35c4ed12a8b0acfc6261fb750b8174edc32b5f785b2c11e10f96e7867493a259ccf501babd99f5b9ae6ca5aa530900bc99c0bd8cf3a38
• Download URL:
  https://stacks.cdc.gov/view/cdc/10704/cdc_10704_DS1.pdf
• File Type:
  [PDF - 10.42 MB ]