Salt-soda sinter process for recovering aluminum from fly ash

Details Salt-soda sinter process for recovering aluminum from fly ash Salt-soda sinter process for recovering aluminum from fly ash

1979-03-27

1981-03-03

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423111, 423132, C01F 708

Patent

active

042540887

ABSTRACT:
A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na.sub.2 CO.sub.3 to a temperature in the range 700.degree.-900.degree. C. for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acid-soluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.

REFERENCES:
patent: 1891608 (1932-12-01), Scheidt
patent: 2174825 (1939-10-01), Freling et al.
patent: 3320032 (1967-05-01), Feller
patent: 3586481 (1971-06-01), Hyde et al.
patent: 3816590 (1974-06-01), Huska et al.
patent: 4032613 (1977-06-01), Schultze et al.
DeCarlo et al., "Dept. of Energy Report, ORNL/TM-6126", Dak Ridge National Lab., Oak Ridge, Tenn., Mar. 1978, 100 pp. (pp. 26-30 and 40-43 relied upon).

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