C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
252/1, 252/10, 5
C22B 34/22 (2006.01) C01B 39/02 (2006.01) C01G 31/00 (2006.01) C22B 7/02 (2006.01)
Patent
CA 1306612
ABSTRACT A PROCESS FOR TREATMENT OF FLYASH APPLICANT: CARBOVAN INC. 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.
517717
Geisler Robert A.
Lakshmanan Vaikuntam I.
Melnbardis Dzinsars
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Carbovan Inc.
Geisler Robert A.
Lakshmanan Vaikuntam I.
Melnbardis Dzinsars
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