Leaching metals from spent hydroprocessing catalysts with ammoni

Details Leaching metals from spent hydroprocessing catalysts with ammoni Leaching metals from spent hydroprocessing catalysts with ammoni

1984-10-30

1985-11-19

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 56, 423 57, 423 62, 423 67, 423 68, 423143, 423145, 423146, 423150, 75103, 75106, 75115, 75119, 75121, C01G 3100, C01G 3900, C01G 4100, C01G 5100

Patent

active

045541388

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.

REFERENCES:
patent: 2204193 (1940-06-01), Spicer et al.
patent: 3539290 (1970-11-01), Erickson et al.
patent: 3567433 (1971-03-01), Gutnikov
patent: 4145397 (1979-03-01), Toida et al.
patent: 4434141 (1984-02-01), Hubred et al.
patent: 4442074 (1984-03-01), Hubred et al.
patent: 4500495 (1985-02-01), Hubred et al.

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