B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
53/142, 252/1.C
B01J 23/90 (2006.01) C01G 31/02 (2006.01) C01G 53/04 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 34/22 (2006.01)
Patent
CA 1210746
ABSTRACT OF THE DISCLOSURE A process for recovery of valuable metals such as prin- cipally nickel and vanadium deposited on used catalyst from catalytic hydroprocessing of hydrocarbon metals-containing feedstocks. In the process, the used catalyst containing metals deposits is treated with a fresh dilute acid solution such as sulfuric acid to extract and remove the metals depo- sits without damage to the catalyst, after which the resulting spent acid solution containing metal salts is neutralized to a pH of about 3.5-12 with a hydroxide solu- tion sufficient to form a metal salts precipitate material. The precipitate material is removed from the liquid such as by filtering, and the precipitate is then heated to evolve water vapor and the water of hydration, leaving oxides of metals such as nickel and vanadium as product. If desired to recover nickel and vanadium oxides separately, the metal oxide material can be further furnace heated with carbon to the respective melting temperatures of the metals, which are successively separately drained from the furnace. Alternatively, to remove nickel and vanadium oxides separa- tely, the spent acid solution containing metal salts is first neutralized with hydroxide solution to a pH of about 3.5-5.0 to precipitate and recover the nickel salts. Upon further addition of hydroxide solution sufficient to neutralize the remaining spent acid solution to a pH of 7-12, vanadium and other metal salts are precipitated and recovered.
451557
Gowling Lafleur Henderson Llp
Hri Inc.
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