Process for recovering aluminum and other metals from fly ash

Details Process for recovering aluminum and other metals from fly ash Process for recovering aluminum and other metals from fly ash

C - Chemistry, Metallurgy

22

B

53/242

C22B 21/02 (2006.01)

Patent

CA 1141968

ABSTRACT OF THE INVENTION A process for recovering aluminum from fly ash con- taining iron, silicon and titanium which comprises: (a) chlorinating the fly ash in an oxidizing atmosphere to selectively chlorinate and vaporize iron chloride from the remaining chlorides, (b) chlorinating the residue from step (a) in a reducing atmosphere of carbon monoxide, in the presence of added silicon chloride to suppress the chlorination of silicon, and vaporizing the chlorides of aluminum, silicon, titanium, and the residual iron, (c) separating and recovering the vaporized chlorides by selective condensation, and treating the residue of step (b) with sulfuric acid to convert calcium chloride to gypsum, and to regenerate a chloridizing and binder solution for pelletizing fly ash feed.

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