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US 4,409,190 AGranted
Extracting cobalt from spent hydroprocessing catalysts with cyanide
AssigneeChevron Research Company
InventorDean A. Van Leirsburg
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Abstract
A process is disclosed for recovery of cobalt from spent catalyst particles. The particles are roasted, leached with an ammonia/ammonium salt leach solution and then leached with a cyanide ion leach solution.
Claims3
A process to leach cobalt from spent catalysts, comprising:
- (a) roasting said spent catalysts at between 400.degree. C. and 600.degree. C.;
- (b) contacting said roasted catalysts with an aqueous ammonia and ammonium salt leach solution forming pregnant liquor and residual catalyst;
- and
- (c) contacting said residual catalyst with a cyanide ion containing second leach solution forming a second pregnant liquor.
1 more element
Dependencies are inferred from the claim text.