Report of Investigations 8866: A Basic Chloride Method for Extracting Aluminum from Clay

Details

• Journal Article:
  NTIS: PB84/213891
• Personal Author:
  Bauer, Donald J. ; Bremner, Paul R. ; Nicks, Larry J.
• Description:
  As part of a program to devise alternative technologies for producing alumina from domestic resources, the Bureau of Mines investigated the leaching of calcined kaolinitic clay to form basic aluminum chloride solutions. Bench-scale experiments were conducted for single-stage batch leaching with alcl3 solution and three-stage countercurrent leaching with substoichiometric hcl. Variable conditions of clay calcination and leaching were studied to determine their effects on aluminum extraction and pregnant liquor composition. With clay calcined at the best temperature of 850 deg c, extraction of more than 93 pct of the aluminum was achieved. The basic chloride pregnant liquors were crystallized and yielded the compound 5alcl3.8Al(oh)3.37.5H2o, which can be thermally decomposed to alumina with 61.6 pct of the energy required for decomposition of alcl3.6H2o. In comparison with the leaching operation in an hcl- clay process, the basic chloride system offers substantial advantages in energy consumption and equipment size requirements. [Description provided by NIOSH]
• Subjects:
  Aluminum Compounds Chlorines Metals Mining Occupational Health Safety
• Source:
  NTIS: PB84/213891; :1-8
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  United States
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13 pdf pages
• NIOSHTIC Number:
  nn:10003491
• Federal Fiscal Year:
  1984
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6eca3bfb60b3c37e8ad6f2de0af56dcda1bf9dff4d1e8892f6e77130535a7d103165f5df759e5c3e591d36e4fd7d257b6e5da4d74299f28d63effc15b16b8f4d
• Download URL:
  https://stacks.cdc.gov/view/cdc/10284/cdc_10284_DS1.pdf
• File Type:
  [PDF - 3.15 MB ]