Process for recovery of metals from used nickel-metal...

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H01M 10/54 (2006.01) C22B 3/26 (2006.01) C22B 3/38 (2006.01) C22B 3/40 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01)

Patent

CA 2207575

In the recycling of used nickel/metal hydride storage batteries, the battery scrap is dissolved in sulphuric acid after mechanical separation of the coarse constituents by magnetic and air separation. A solvent extraction is performed with the digestion solution, from which the rare earths (from the hydrogen-storage alloys in the negative electrodes) and iron and aluminium have been selected by precipitation, under conditions (ph [sic], choice of solvent, volumetric ratio of the phases) which are such that the aqueous phase contains nickel and cobalt in the same atomic ratio as that in which they were present in the scrap. This makes possible a joint recovery by simultaneous electrolysis, in which process the deposition product forms a master alloy which can be used, together with the precipitated rare earths which have been electrometallurgically reprocessed as mixed metal, for the production of fresh hydrogen-storage alloys.

Lors du recyclage d'accumulateurs usés en nickel-hydrure métallique, les batteries mises à la ferraille sont dissoutes dans de l'acide sulfurique, une fois que les parties grossières ont été mécaniquement séparées dans un séparateur magnétique à vent. Les terres rares (faisant partie des alliages de stockage d'hydrogène dans les électrodes négatives), le fer et l'aluminium sont séparés par précipitation, puis la solution de désintégration est soumise à une extraction avec solvant dans des conditions telles (valeur de pH, choix du solvant, rapport en volume entre les phases) que la quantité et le rapport atomique de nickel et de cobalt dans la phase aqueuse soient les mêmes que dans la ferraille. On peut ainsi les récupérer ensemble par électrolyse simultanée. Le produit ainsi obtenu forme un préalliage qui peut être utilisé avec les terres rares précipitées et transformées en mischmétal par un procédé électrométallurgique pour produire de nouveaux alliages de stockage d'hydrogène.

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