Pyrohydrolysis process for spent aluminum reduction cell linings

Details Pyrohydrolysis process for spent aluminum reduction cell linings Pyrohydrolysis process for spent aluminum reduction cell linings

1978-05-30

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

041608089

ABSTRACT:
An improved process is provided for the recovery of HF in increased yield from spent aluminum reduction cell linings. The spent linings are pyrohydrolyzed in a fluidized bed reactor and the generated Na-containing vapors and gases are then contacted with a relatively finely divided source of Al.sub.2 O.sub.3. Contacting is preferably accomplished in the close vicinity of the fluidized bed to obtain extended reaction between the Al.sub.2 O.sub.3 source and the vapors. This extended reaction allows conversion of the Na-containing compounds, such as NaF and Na.sub.2 O to HF and an Na.sub.2 OxAl.sub.2 O.sub.3 compound.

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

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