Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1977-06-20
1978-12-19
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
204113, 423339, C01F 702, C25C 106
Patent
active
041306279
ABSTRACT:
A process for recovering mineral values from fly ash in commercial quantities comprising forming an alkaline aqueous fly ash blend, filtering the alkaline aqueous fly ash blend and recovering a solids blend therefrom, leaching the solids blend with hydrochloric or hydrofluoric acid to form dissolved chloride or fluoride salts of iron, aluminum and other metals, electrolyzing the dissolved chloride or fluoride salt solution to plate out at least iron, and, optionally, one or more other metals, recovering silicon dioxide as a precipitate from the leaching solution, and recovering the leaching solution free of silicon dioxide. Neutralizing the leaching solution in a certain pH range permits precipitation and recovery of aluminum hydroxide as a solid. The hydroxide may then be converted to alum or alumina by conventional methods.
REFERENCES:
patent: 1420130 (1922-06-01), Moxham
patent: 1444887 (1923-02-01), Schwiete
patent: 1752348 (1930-04-01), Levy
Jacobson, Encyclopedia of Chemical Reactions, Reinhold Publishing Company, vol. I, (1946), p. 80.
Heagy Richard T.
Russ James J.
Russ James S.
Bright Patrick F.
Kendrick Elwood S.
Langel Wayne A.
Vertiz O. R.
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