Process for preparing cryolite from fly ash

Details Process for preparing cryolite from fly ash Process for preparing cryolite from fly ash

1982-03-01

1982-12-07

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423111, 423126, 423119, 423132, C01F 754

Patent

active

043627030

ABSTRACT:
Cryolite (Na.sub.3 AlF.sub.6) as a source of aluminum is prepared from coal fly ash by reacting the aluminum oxide (Al.sub.2 O.sub.3) in fly ash with phosphoric acid to form aluminum phosphate, which is then converted to sodium aluminate by reaction with sodium hydroxide, and the sodium aluminate is converted to cryolite by reaction with hydrofluoric acid (HF), or equivalent reagent providing H.sup.+ and F.sup.- ions. Aluminum is thereby obtained from fly ash in a preferred form (as cryolite) for use in producing metallic aluminum.

REFERENCES:
patent: 2567544 (1953-09-01), Brodal et al.
patent: 2916352 (1959-12-01), Fitch et al.
patent: 2991159 (1961-07-01), Wendt
patent: 3666406 (1972-05-01), Kitano
patent: 4069296 (1978-01-01), Huang
Chomiakow et al., "Chemical Absts.", vol. 92, 1960, #179988c, p. 555.

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