Recovery of aluminum and other metal values from fly ash

Details Recovery of aluminum and other metal values from fly ash Recovery of aluminum and other metal values from fly ash

1979-11-01

1981-02-24

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423 9, 423 10, 423 70, 423139, 423125, 423126, 423128, 423132, 423112, C01F 700

Patent

active

042527775

ABSTRACT:
The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.

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patent: 1310413 (1919-07-01), Eberhardt
patent: 1891608 (1932-12-01), Scheidt
patent: 2174825 (1939-10-01), Freling et al.
patent: 4024220 (1977-05-01), Ostroff et al.
patent: 4113833 (1978-09-01), Eremin et al.
Condry, "Coal Research Bureau, Report No. 130," West Va. Univ., Morgantown, W. Va., Jul. 1976.
DeCarlo et al., "Dept. of Energy Report, ORNC/TM-6126", Oak Ridge National Lab., Oak Ridge, Tenn., Mar. 1978.

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