Alumina Miniplant Operations-Separation of Aluminum Chloride Liquor from Leach Residue by Horizontal Belt Filtration

Details

• Personal Author:
  Sawyer DL Jr. ; Sorensen, Roy T.
• Description:
  The Bureau of Mines has investigated the recovery of alumina by hydrochloric acid leaching of calcined kaolinitic clay. Bench-scale studies indicated that horizontal belt filtration was a practical method for separating the siliceous residue from aluminum chloride liquor generated in the leaching step. Mini-plant-scale continuous testing was performed to evaluate the filter circuits and to compare filtration response of different calcined kaolin feed materials and of different agitator-baffle designs in the leaching reactors. Soluble alumina recovery with a single filter ranged from 94 pct with minus 10-mesh feed to more than 96 pct with minus 35-mesh or misted feed. Process advantages were confirmed for the calcined misted kaolin feed material prepared by a Bureau-developed misting process. With two filters in series, an overall filtration rate of 100 lb solids/hr.Ft-2 of filter area was attained with a soluble alumina recovery of more than 99 pct. More than 99.5 pct alumina recovery was obtained with a thickener and a two-filter circuit for either the minus 35-mesh or the misted feed. Modifications in leaching reactor design made to decrease particle-to-particle attrition were successful and significantly increased filtration rates and decreased flocculant requirements. [Description provided by NIOSH]
• Content Notes:
  in NTRL, no pdf
• Subjects:
  Aluminum Compounds Aluminum Oxide Filtration Occupational Health Safety
• Keywords:
  Aluminum oxide; Materials recovery; Filtration; Leaching; Clays; Chemical reactors; Revisions; Performance evaluation; Design criteria; Flocculants
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• Place as Subject:
  Nevada ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  BCEL - Boulder City Engineering Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-44
• NIOSHTIC Number:
  nn:10003228
• NTIS Accession Number:
  PB84152941
• Citation:
  Boulder City, NV: U.S. Department of the Interior, Bureau of Mines, RI 8831, 1983 Dec; :1-44
• Federal Fiscal Year:
  1984
• Peer Reviewed:
  False
• Source Full Name:
  Boulder City, NV: U.S. Department of the Interior, Bureau of Mines, RI 8831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3249f06b6df2b380d8d95b2271242c3a0f51034a96fe1bd779c34244e0ed742e622e9ec3c6890e9599e072619095292ad12c3a03a527cca9d7d6b1388009cbf9
• Download URL:
  https://stacks.cdc.gov/view/cdc/233948/cdc_233948_DS1.pdf
• File Type:
  [PDF - 17.07 MB ]