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Leaching rates for the HCl extraction of aluminum from calcined kaolinitic clay.

Authors
Olsen-RS; Bullard-SJ; Gruzensky-WG; Mrazek-RV; Henry-JL
Source
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8744, 1983 Feb; :1-11
Link
NIOSHTIC No.
10002706
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 leching 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-1 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
Publication Date
19830201
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-187575
NTIS Price
Identifying No.
RI-8744
NIOSH Division
ALRC
Source Name
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8744
State
OR; GA
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