Pyrohydrolysis system for processing fluorine-containing spent a

Details Pyrohydrolysis system for processing fluorine-containing spent a Pyrohydrolysis system for processing fluorine-containing spent a

1978-11-06

1979-06-19

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423111, 423133, 423484, 423489, 423DIG16, C01F 704, C01B 722

Patent

active

041587014

ABSTRACT:
A pyrohydrolysis system is provided for the recovery of valuable components from waste and spent materials generated in electrolytic aluminum reduction facilities. The pyrohydrolysis system employs a dense phase fluidized bed reaction zone for the pyrohydrolysis of coarse feed, a dilute phase fluidized reaction zone for pyrohydrolyzing fine feed, this zone being superimposed and interconnected with the dense phase zone. The offgases, after removal of the solids, are contacted in a dilute phase fluidized zone, with a source of Al.sub.2 O.sub.3 to remove residual Na values and to produce Na-free HF. The solids from the first dilute zone, having a desired high Na:Al atom ratio, can be combined with the product clinker from the dense bed zone. The offgas, containing the source of Al.sub.2 O.sub.3, is subjected to solids separation, the solids-free and Na-free HF is utilized, while the solids of low Na:Al mole ratio are recycled to the residual Na conversion step.

REFERENCES:
patent: 3023676 (1963-01-01), Mollard et al.
patent: 3635408 (1972-01-01), Williams
patent: 4006066 (1977-02-01), Sparwald
patent: 4065551 (1977-12-01), Dahl
patent: 4113832 (1978-09-01), Bell et al.

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