Process for treatment of flyash

Details Process for treatment of flyash Process for treatment of flyash

1987-06-08

1989-01-17

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vb metal

75101R, 209 2, 209 10, 423 68, 423118, C01G 3100

Patent

active

047987090

ABSTRACT:
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.

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