Report of Investigations 9126: Dual Leaching Method for Recovering Silver and Manganese from Domestic Manganiferous Silver Deposits

Details

• Journal Article:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9570
• Personal Author:
  Pahlman, John E. ; Rhoades, Charles A. ; Chamberlain, Peter G.
• Description:
  The report describes a U.S. Bureau of Mines' study on the hazards of large-scale conveyor belt fires as a function of both air velocity and distance from belt surface to gallery roof. The fire hazards considered were smoke obscuration, toxic effects of carbon monoxide (CO), and elevated air temperatures downstream of the fire. All of these hazards scale with the ratio of fire intensity to ventilation airflow. These hazards were all found to be greater at the lower belt-to-roof distance, owing to the greater fire intensities that resulted. The hazards of smoke obscuration and elevated CO levels were greater at lower air velocities. Smoke obscuration was found to be the earliest hazard, reaching critical levels before the stage of belt flame spread. Critical levels of CO and downstream air temperatures were not reached until the later stages of flame spread. Fire growth rates during rapid flame spread were much greater than the fire growth rates measured during the early stages of belt burning. Data were analyzed to determine the early-warning capability of fire sensors. Smoke sensors provided the earliest warning, followed closely by CO sensors. Thermal sensors did not exhibit any early warning capability. [Description provided by NIOSH]
• Subjects:
  Metals Minerals Mining Occupational Health Safety
• Keywords:
  Mine-fires; Mining-equipment; Mining-industry; Toxic-gases; Fire-hazards; Fire-safety
• Source:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9570, 1995 May; :1-33
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13 pdf pages
• NIOSHTIC Number:
  nn:10012539
• NTIS Accession Number:
  PB95-264792
• CAS Registry Number:
  Carbon monoxide (CAS RN 630-08-0)
• Federal Fiscal Year:
  1995
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0228d994d7f27d81377abb6680cfa07623d86ab09c98e21410562c4a5c6a2830bd5e75364a3cca6182e8a7a666fb541d7da0879a9f79a867b222c7eb16a06ffb
• Download URL:
  https://stacks.cdc.gov/view/cdc/10419/cdc_10419_DS1.pdf
• File Type:
  [PDF - 4.94 MB ]