Leaching cobalt from spent hydroprocessing catalysts with sulfur

Details Leaching cobalt from spent hydroprocessing catalysts with sulfur Leaching cobalt from spent hydroprocessing catalysts with sulfur

1982-09-24

1984-02-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423 53, 423 55, 423 62, 423 68, 423143, C01G 5100

Patent

active

044329539

ABSTRACT:
A process for enhancing recovery of 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 and vanadium. The once-leached spent hydroprocessing catalysts are contacted with a second aqueous solution of sulfur dioxide. The metal values are precipitated with hydrogen sulfide and the precipitate is roasted with unroasted spent hydroprocessing catalysts.

REFERENCES:
patent: 2928732 (1960-03-01), Bare et al.
patent: 3567433 (1971-03-01), Gutnikov
patent: 3848054 (1974-11-01), Wienwiowski
patent: 3911076 (1975-10-01), Probert et al.
patent: 4066733 (1978-01-01), Dubeck et al.
patent: 4289605 (1981-09-01), Bartholic

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