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US 4,554,138 AGranted
Leaching metals from spent hydroprocessing catalysts with ammonium sulfate
AssigneeChevron Research Company
InventorPaul J. Marcantonio
Life of this patent
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Abstract
A process for enhancing recovery of metals, especially cobalt, from spent hydroprocessing catalysts when the spent catalyst particles are first roasted at between 400.degree. C. and 600.degree. C. and then contacted with a first aqueous solution of ammonia and an ammonium salt to recover nickel, cobalt, molybdenum, tungsten, and vanadium. The once-leached spent hydroprocessing catalysts are again leached by contacting them with a second aqueous solution of ammonium sulfate at a pH of 1 to 4.
Claims7
A process to extract metals from spent hydroprocessing catalyst particles comprising:
- (a) roasting said catalyst particles at a temperature in the range of between 400.degree. C. and 600.degree. C.;
- (b) contacting said roasted catalyst particles with a first aqueous solution of ammonia and ammonium salt;
- (c) separating said catalyst particles from said first aqueous solution;
- (d) contacting said catalyst particles with a second aqueous solution of ammonium sulfate at a pH in the range of from about 1 to 4;
- and
- (e) separating said catalyst particles from said second solution.
3 more elements
Dependencies are inferred from the claim text.