Process for the recovery of metals from used nickel/metal hydrid

Details Process for the recovery of metals from used nickel/metal hydrid Process for the recovery of metals from used nickel/metal hydrid

1997-06-16

1999-01-12

Kastler, Scott

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

429 49, C22B 300, H01M 1054

Patent

active

058580611

ABSTRACT:
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 aluminum have been selected by precipitation, under conditions pH, 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 misch metal, for the production of fresh hydrogen-storage alloys.

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patent: 5429887 (1995-07-01), Lyman et al.
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