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Extraction of aluminum from clay.

Authors
Gruzensky-WG; Olsen-RS
Source
U S Patent 4,388,280 1983 Jun; :1-5
NIOSHTIC No.
10003485
Abstract
Clay is ground to a particle size of -14 mesh and during agitation is treated with a fine mist of H2O in an amount sufficient to form compact surfaces without causing agglomeration. The mist-treated clay is dried at 100 deg - 350 deg C to cause the particles to shrink and harden. The particles are calcined and then leached with an inorganic acid to extract the Al. Because of the treatment with a mist of H2O, the solid material remaining has a greater sedimentation rate and is more permeable to H2O. Thus, a clay not treated with an H2O mist gave particles that had a fuzzy surface when calcined at 750 deg C, 5.7-10.8% fines during fluidized-bed roasting, and a density of 0.95-0.99 G/Cm3. The sedimentation rate was 4.0-14.3 Cm/min and permeability to H2O on a buchner funnel (5.8- 11.0)X10-8 Cm3 of the solids remaining after leaching with HCl. The respective values for clay treated with a mist of H2O were 1.7, 0.99, 16.2, and 11.2X10-8 and the calcined particles had a dense compacted surface.
Publication Date
19830614
Document Type
Patent
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
PAT 4,388,280
NIOSH Division
ALRC
Source Name
U.S. Patent No. 4,388,280
State
OR
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