Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1976-04-09
1977-06-14
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423120, 423122, 423567R, 423131, 423629, 423522, C01F 706, C01F 714
Patent
active
040297373
ABSTRACT:
This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate, roasting a third time in an oxidizing atmosphere to convert any sulfides formed in the second roast, leaching with a weak base, leaching with water to remove potassium and sulfate, extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide, removing contaminant silica from the leach solution, and precipitating aluminum hydroxide by cooling and seeding the solution.
REFERENCES:
patent: 3890425 (1975-06-01), Stevens et al
patent: 3890426 (1975-06-01), Stevens et al.
Copenhaver Julian V.
Forberg Helge O.
Jennings Larry D.
Stevens Douglas
Thompson David L.
Carter Herbert T.
Earth Sciences Inc.
Hanegan Herbert M.
National Steel Corporation
Southwire Company
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