Carbovan Inc.

Nairn M McQueen

Vaikuntam Iyer Lakshmanan

Robert A Geisler

Dzinsars Melnbardis

A process is described for recovering vanadium and zeolitic alumino-silicates from flyash and similar carbon-bearing heat treated materials. The process includes steps for the separation of carbon, followed by pressure leaching the carbon-depleted flyash in relatively dilute alkali metal hydroxide solutions at elevated temperatures. The leach liquor is separated from the residue and is subsequently treated in an amine containing solvent extraction process step for vanadium recovery, and optionally, for other metals present in the leach liquor. The vanadium in the strip liquor is precipitated to obtain vanadium containing compounds. The leach residue is treated separately to recover zeolitic alumino-silicates therefrom. In another variation of the process, the vanadium is recovered from the leach liquor by means of a strong base anoin exchange resin.

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Dundas, Canada

Nairn M McQueen