Process for treating AB.sub.5 nickel-metal hydride battery scrap

Details Process for treating AB.sub.5 nickel-metal hydride battery scrap Process for treating AB.sub.5 nickel-metal hydride battery scrap

1994-05-16

1995-07-04

Langel, Wayne

Chemistry: electrical current producing apparatus, product, and

Regenerating, salvage or repair feature other than only...

241 14, 423 211, 423 49, 423 50, 423112, 423122, 423139, 423140, H01M 652

Patent

active

054298873

ABSTRACT:
A process for treating an AB.sub.5 Ni--MH battery to recover purified positive and negative electrode components of the battery is disclosed. An AB.sub.5 Ni--MH battery is placed in a mineral acid leach solution to cause the positive and negative electrode components of the battery to separate. The positive and negative electrode components are maintained in the leach solution until the negative electrode component breaks down into its dissolved rare earth metal constituents and metallic solids. The metallic solids remaining from the negative electrode component and the positive electrode components are separated from the mineral acid leach solution and subjected to an elutriation process and thereafter to ball milling to obtain Ni rich powder and Fe. The mineral acid leach solution containing the completely dissolved rare earth metals is subjected to a phosphate precipitation process to recover La and Ce in precipitate, and then subjected to a second precipitation process to recover Ni, Co, Mn and Al.

REFERENCES:
patent: 3506550 (1970-04-01), Knapp, Jr.
patent: 4229508 (1980-10-01), Mussler
patent: 4473623 (1984-09-01), Ishikura et al.
patent: 4637928 (1987-01-01), Zajac, Jr. et al.
patent: 5100745 (1992-03-01), Earl

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