Modified pyrohydrolysis process for spent aluminum reduction cel

Details Modified pyrohydrolysis process for spent aluminum reduction cel Modified pyrohydrolysis process for spent aluminum reduction cel

1978-07-24

1979-07-10

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423111, 423133, 423484, 423489, 423DIG16, 423240, C01F 704, C01B 719

Patent

active

041608097

ABSTRACT:
Fluoridic spent and waste materials, such as are generated in electrolytic aluminum reduction systems, are pyrohydrolyzed in a fluidized bed reactor. For fluidization of these materials, as well as for the combustion of carbon present in the materials, an O.sub.2 -containing gas stream, containing at least about 90% by volume O.sub.2, is employed. This results in the generation of an HF-containing offgas of significantly increased HF level, which can be employed for the manufacture of an AlF.sub.3 product of at least about 85% by weight AlF.sub.3 content from hydrated alumina. The offgas having the increased HF content can also be employed for the production of highly concentrated HF acid with significantly lower energy requirement needed for concentration than in conventional systems.

REFERENCES:
patent: 3073676 (1963-01-01), Mollard et al.
patent: 4113832 (1978-09-01), Bell et al.

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