Process for treatment of flyash

Details Process for treatment of flyash Process for treatment of flyash

1988-07-14

1990-10-30

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423 54, 423 63, 423112, C01B 3326

Patent

active

049667610

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.
In another variation of the process, the vanadium is recovered from the leach liquor by means of a strong base anoin exchange resin.

REFERENCES:
patent: 3083085 (1963-03-01), Lewis et al.
patent: 3890427 (1975-06-01), Dewey et al.
patent: 4121945 (1978-10-01), Hurst et al.
patent: 4344924 (1982-08-01), Lucas et al.
patent: 4640823 (1987-02-01), Goddard
patent: 4666686 (1987-05-01), Krajewski et al.
patent: 4724129 (1988-02-01), Helgorsky et al.

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