Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1983-10-21
1985-09-03
Carter, H. T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423133, 423150, 423336, 423341, 423343, 423484, C01F 700, C01B 3318
Patent
active
045391874
ABSTRACT:
A method for separating and recovering substantially pure aluminum, iron and silica from fly ash, a by-product of coal combustion, includes reacting the fly ash with aqueous fluosilicic acid and aqueous hydrogen fluoride at temperatures sufficiently high to form aqueous silicon fluoride vapor and fluorides and fluosilicate of aluminum and iron, separating the aluminum and iron fluorides and fluorosilicates from the aqueous silicon fluoride vapor, hydrolizing the silicon fluoride vapor to form silicon dioxide in substantially pure form and hydrogen fluoride, recovering and recycling the hydrogen fluoride for reuse in the process, and separating the aluminum and iron fluorides and fluosilicates from one another, and recovering substantially pure aluminum fluoride, substantially pure iron and other substantially pure metals, by electroplating or otherwise.
REFERENCES:
patent: 1036453 (1912-08-01), Childs
patent: 3961030 (1976-06-01), Wiewiorowski et al.
patent: 4069296 (1978-01-01), Huang
Russ James J.
Smith John W.
Carter H. T.
Hydro Fuels, Inc.
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