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Leaching Rates for the HCl Extraction of Aluminum from Calcined Kaolinitic Clay.

PB83187575

Publication Date	1983
Personal Author	Olsen, R. S.; Bullard, S. J.; Gruzensky, W. G.; Mrazek, R. V.; Henry, J. L.
Page Count	18
Abstract	The Bureau of Mines is engaged in research to recover aluminum from kaolinitic clay and other nonbauxitic domestic resources. As part of this work, calcined Georgia kaolin was prepared by a process that prevents slime formation and makes the leached residues fast settling and easy to filter. The leaching reaction for calcined kaolinitic clay in a 5 pct stoichiometric excess of boiling 23- to 26-pct HCl was found to be zero order. Rate constants based on the weight-fraction of aluminum in the clay were found to be between 0.095 and 0.15 min depending on feed preparation and leaching parameters. The mathematical relationships between aluminum extraction and time for both batch and continuous, stirred-tank operations were derived and verified experimentally.
Keywords	Leaching Aluminum oxide Kaolinite Hydrometallurgy Extractive metallurgy Hydrochloric acid Aluminum
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau of Mines, Albany, OR. Albany Research Center.
Supplemental Notes	Library of Congress catalog card no. 82-600329.
Document Type	Technical Report
Title Note	Rept. of investigations/1983.
NTIS Issue Number	198315

Leaching Rates for the HCl Extraction of Aluminum from Calcined Kaolinitic Clay.

Leaching Rates for the HCl Extraction of Aluminum from Calcined Kaolinitic Clay.
PB83187575

Publication Date	1983
Personal Author	Olsen, R. S.; Bullard, S. J.; Gruzensky, W. G.; Mrazek, R. V.; Henry, J. L.
Page Count	18
Abstract	The Bureau of Mines is engaged in research to recover aluminum from kaolinitic clay and other nonbauxitic domestic resources. As part of this work, calcined Georgia kaolin was prepared by a process that prevents slime formation and makes the leached residues fast settling and easy to filter. The leaching reaction for calcined kaolinitic clay in a 5 pct stoichiometric excess of boiling 23- to 26-pct HCl was found to be zero order. Rate constants based on the weight-fraction of aluminum in the clay were found to be between 0.095 and 0.15 min depending on feed preparation and leaching parameters. The mathematical relationships between aluminum extraction and time for both batch and continuous, stirred-tank operations were derived and verified experimentally.
Keywords	Leaching Aluminum oxide Kaolinite Hydrometallurgy Extractive metallurgy Hydrochloric acid Aluminum
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau of Mines, Albany, OR. Albany Research Center.
Supplemental Notes	Library of Congress catalog card no. 82-600329.
Document Type	Technical Report
Title Note	Rept. of investigations/1983.
NTIS Issue Number	198315