Extraction and production of alumina containing less than 0.03 p

Details Extraction and production of alumina containing less than 0.03 p Extraction and production of alumina containing less than 0.03 p

1980-10-22

1982-04-13

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423127, C01F 706, C01F 720, C01F 734

Patent

active

043247695

ABSTRACT:
A wet caustic aluminate process that comprises digesting a bauxite at a low temperature in caustic aluminate liquor to extract the alumina trihydrate, separating the supersaturated caustic aluminate liquor of low Fe.sub.2 O.sub.3 content from the mud, digesting the mud or a mixture of mud and bauxite at a higher temperature in caustic aluminate liquor to extract the majority of the remaining monohydrate and trihydrate, separating the supersaturated caustic aluminate liquor of higher Fe.sub.2 O.sub.3 content from the residue, precipitating alumina hydrate from the two supersaturated caustic aluminate liquors, recyling spent caustic aluminate liquor to digestion and calcining alumina hydrate to alumina with a Fe.sub.2 O.sub.3 content less than 0.03%.

REFERENCES:
patent: 2701751 (1955-02-01), Porter
patent: 2852343 (1958-09-01), Scandrett et al.

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