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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

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