Report of Investigations 7461: Batch Reduction of Iron Ore in Fluidized Bed

Details

• Personal Author:
  Aufman, J. A. ; Berryhill, J. E. ; Hansen, John P.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  Batches of red or brown iron ore concentrates, weighing 100 or 200 grams, were reduced with gaseous reductants in a laboratory-sized fluidized-bed reactor. Using a loss of weight technique, the rates of reduction were measured and the effects of temperature, gas consumption, and gas flow rates were determined. Below about 725 deg. C the rate of reduction was controlled by the chemical reaction at the reduction interface having an activation energy of about 10 kcal/g mole. Above about 725 deg. C the rate of reduction appeared to be controlled by the flow of the gaseous reductant and therefore to be directly proportional to the flow rate. Above 725 deg. C, hydrogen reduced the iron ore much faster than carbon monoxide. In gas mixtures, carbon monoxide or nitrogen reduced the hydrogen partial pressure and lowered the reaction rate proportionally. When present in large concentrations, carbon monoxide had a serious inhibiting effect on the reduction rate, probably owing to carburization and sintering of the reduced iron. [Description provided by NIOSH]
• Subjects:
  Ferrous Compounds Metals Mining Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Place as Subject:
  Alabama ; OSHA Region 4
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TURC - Tuscaloosa Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  30 pdf pages
• NIOSHTIC Number:
  nn:10009210
• NTIS Accession Number:
  PB-196688
• Citation:
  Washington, DC: U.S. Department of the Interior, Bureau of Mines, RI 7461, 1970 Jan; :1-25
• Federal Fiscal Year:
  1970
• Peer Reviewed:
  False
• Source Full Name:
  Washington, DC: U.S. Department of the Interior, Bureau of Mines, RI 7461
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6ea76fc41712e0a7ad0ef39c4298db7e85df6e1c0cc979f6374a64b457caec5b284e3713a406972d383af821f77090737797badaa70478fbb38002a4ba743949
• Download URL:
  https://stacks.cdc.gov/view/cdc/201668/cdc_201668_DS1.pdf
• File Type:
  [PDF - 1.05 MB ]