Process to recover molybdenum and vanadium metals from spent...

C - Chemistry – Metallurgy – 22 – B

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C22B 34/34 (2006.01) C22B 3/12 (2006.01) C22B 7/00 (2006.01) C22B 34/32 (2006.01)

Patent

CA 2331322

There is provided a process to reclaim molybdenum, vanadium and other hydrodesulfurisation metals from catalysts, said process comprising collecting one or more catalysts containing at least one metal sulfide; leaching the catalyst in an atmospheric alkaline leach step; separating the leached slurry into a first liquid stream and a first solid; leaching the first solid in a caustic pressure leach process; separating the second leached slurry into a second liquid stream and a second solid; collecting the first and second liquid streams; oxidizing the combined liquid stream; cooling the oxidized liquid stream; adjusting the pH of the oxidized liquid stream; contacting the cooled oxidized liquid stream with an organic solvent containing an extractant; stripping the soluble metal species from the organic phase; adjusting the pH of the aqueous phase to selectively precipitate at least one metal as a metal salt; and separating the metal salt from the aqueous phase.

L'invention concerne un procédé qui permet de récupérer du molybdène, du vanadium et d'autres métaux d'hydrodésulfuration à partir de catalyseurs. Selon le procédé, on réunit un ou plusieurs catalyseurs contenant au moins un sulfure métallique ; dans une étape de lixiviation alcaline à la pression atmosphérique, on soumet le catalyseur à une lixiviation ; on sépare la bouillie lixiviée en un premier flux liquide et un premier solide ; dans un procédé de lixiviation caustique sous pression, on soumet le premier solide à une lixiviation ; on sépare la seconde bouillie lixiviée en un second flux liquide et un second solide ; on réunit le premier et le second flux liquide ; on oxyde le flux liquide combiné ; on refroidit le flux liquide oxydé ; on ajuste le pH du flux liquide oxydé ; on met en contact le flux liquide oxydé refroidi avec un solvant organique contenant un extracteur ; on extrait l'espèce métallique soluble de la phase organique ; on ajuste le pH de la phase aqueuse de façon à précipiter sélectivement au moins un métal sous forme de sel métallique ; et on sépare le sel métallique de la phase aqueuse.

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