Vanadium recovery from ash from oil sands

Details Vanadium recovery from ash from oil sands Vanadium recovery from ash from oil sands

C - Chemistry, Metallurgy

22

B

53/141

C22B 34/22 (2006.01) C22B 7/02 (2006.01)

Patent

CA 1221243

TITLE VANADIUM RECOVERY FROM ASH FROM OIL SANDS INVENTORS Peter John Griffin Thomas Harvey Etsell ABSTRACT OF THE DISCLOSURE Vanadium can be recovered efficiently from ash from oil sands of Western Canada by, (a) roasting the ash in air with sodium chloride at from 700°-950°C for 2-12 hours to form a calcine, (b) leaching the calcine with aqueous leachant of pH 5-12 at temperatures up to the boiling point, (c) precipitating the vanadium as ammonium metavanadate by one of, i) acidifying the loaded leachant and adding an ammonium salt, ii) solvent extracting the loaded leachant, stripping the loaded solvent with dilute acid and adding an ammonium salt to the strip solution, and (d) heating the ammonium metavanadate to form vanadium pentoxide.

446529

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