Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1983-08-01
1985-02-19
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 54, 423 55, 423 62, 423 63, 423 65, 423 68, 423139, 423140, 423143, 423150, 75101BE, C01G 3100, C01G 3900, C01G 4100, C01G 5100
Patent
active
045004951
ABSTRACT:
A process for recovering the metal values from spent hydroprocessing catalyst particles. The metal values will include at least one metal of Group VIII of the Periodic Table and at least one metal of Group Vb or Group VIb of the Periodic Table. 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 forming a first pregnant liquor. The once-leached spent hydroprocessing catalysts are contacted with a second aqueous solution of sulfur dioxide forming a second pregnant liquor. The metal values are precipitated from the second pregnant liquor with hydrogen sulfide and the precipitate is roasted with unroasted spent hydroprocessing catalysts. The metal values of Group Vb and Group VIb in the first pregnant liquor are transferred into a first organic solution by liquid ion exchange. The first organic solution is stripped by an aqueous strip solution and the metal values separated by sequential precipitation. The metals of Group VIII are separated and purified by serial liquid ion exchange.
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Hubred Gale L.
Van Leirsburg Dean A.
Carter Herbert T.
Cavalieri V. J.
Chevron Research Company
La Paglia S. R.
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