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Pressure Leaching Alumina from Raw Kaolinitic Clay Using Hydrochloric Acid.


PB86126729

Publication Date 1985
Personal Author Sawyer, D. L.; Turner, T. L.
Page Count 26
Abstract The Bureau of Mines studied alumina extraction from uncalcined, kaolinitic clay at temperatures from 100 to 250C using 20- or 27- wt-pct-HCl concentrations and with an acid-to-clay ratio of from 0.8 to 1.4 times stoichiometric. A combination of high temperature and 20 wt pct excess HCl promoted rapid and almost quantitative extraction of alumina (99 pct in some tests). Additional Bureau data obtained with 35-mL tantalum bombs and leaching tests with added fluoride are also provided. At high temperatures, the addition of fluoride did not result in a significant improvement over HCl alone and was deleterious to the filtering properties of the digest residue.
Keywords
  • Aluminum dioxide
  • Clay minerals
  • Solvent extraction
  • Kaolinite
  • Leaching
  • Hydrochloric acid
  • Performance evaluation
  • Filtration
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors Bureau of Mines, Reno, NV. Reno Research Center.
Supplemental Notes Library of Congress catalog card no. 84-600147.
Document Type Technical Report
Title Note Rept. of investigations/1985.
NTIS Issue Number 198606
Pressure Leaching Alumina from Raw Kaolinitic Clay Using Hydrochloric Acid.
Pressure Leaching Alumina from Raw Kaolinitic Clay Using Hydrochloric Acid.
PB86126729

  • Aluminum dioxide
  • Clay minerals
  • Solvent extraction
  • Kaolinite
  • Leaching
  • Hydrochloric acid
  • Performance evaluation
  • Filtration
  • Bureau of Mines
  • 48A - Mineral Industries
  • 99B - Industrial Chemistry & Chemical Process Engineering
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