Rhenium recovery by oxidative and acid conditions and...

C - Chemistry – Metallurgy – 22 – B

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C22B 61/00 (2006.01)

Patent

CA 2756337

There is provided a hydrometallurgical process of recovering rhenium values from mixtures thereof with other met-al values in which the rhenium values constitute a minority amount, for example super-alloys, which comprises subjecting the mixture to strongly oxidizing acid conditions, preferably an aqueous mixture of hydrochloric acid and nitric acid, so as to form perrhenate species of at least the major proportion of the rhenium values in the mixture, dissolving the perrhenate species and oth-er soluble metal species in aqueous solution, removing insoluble metal species from the aqueous solution, and isolating the rheni-um species from the solution.

Procédé hydrométallurgique de récupération de valeurs de rhénium dans des mélanges de rhénium avec d'autres valeurs de métaux dans lesquels les valeurs de rhénium constituent une quantité minoritaire, par exemple des superalliages. Ce procédé consiste à soumettre le mélange à des conditions de forte oxydation de préférence un mélange aqueux d'acide chlorhydrique et d'acide nitrique de manière à former des espèces de perrhénate pour au moins la majeure partie des valeurs de rhénium dans le mélange, à dissoudre les espèces de perrhénate et autres espèces métalliques solubles dans la solution aqueuse, à extraire les espèces métalliques insolubles de cette solution et à en isoler les espèces de rhénium.

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