Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1982-03-17
1983-05-31
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423111, 423150, 423113, 423131, 423132, C01G 4902
Patent
active
043860575
ABSTRACT:
A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the fly ash is separated and treated with a hot strong alkali solution which dissolves most of the silica and alumina in the fly ash, leaving a solid residue and forming a precipitate which is an acid soluble salt of aluminosilicate hydrate. The residue and precipitate are then treated with a strong mineral acid to dissolve the precipitate leaving a solid residue containing at least 90 weight percent iron oxide.
REFERENCES:
patent: 1873642 (1932-08-01), Guertler
patent: 3198622 (1965-08-01), Herzog et al.
patent: 4242313 (1980-12-01), Torma
patent: 4254088 (1981-03-01), McDowell et al.
Dobbins Michael S.
Murtha Marlyn J.
Besha Richard G.
Carter Herbert T.
Rees Walter L.
The United States of America as represented by the United States
Weinberger James W.
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