Recovering metals from spent hydroprocessing catalysts

C - Chemistry – Metallurgy – 22 – B

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C22B 3/00 (2006.01) B01J 23/94 (2006.01) C01G 31/00 (2006.01) C01G 39/00 (2006.01) C01G 51/00 (2006.01) C01G 51/12 (2006.01) C01G 53/00 (2006.01) C01G 53/12 (2006.01) C22B 3/26 (2006.01) C22B 3/28 (2006.01) C22B 3/30 (2006.01) C22B 7/00 (2006.01) C22B 23/00 (2006.01) C22B 23/02 (2006.01) C22B 34/22 (2006.01) C22B 34/34 (2006.01)

Patent

CA 1221244

ABSTRACT OF THE DISCLOSURE 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 par- ticles are first roasted at between 400°C and 600°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 hydropro- cessing 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 precipita- tion. The metals of Group VIII are separated and purified by serial liquid ion exchange.

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