Title:
METHOD FOR SEPARATING NIKEL AND COBALT FROM ACTIVE MATERIALS CONTAINED IN SPENT NICKEL-HYDROGEN BATTERY
Document Type and Number:
WIPO Patent Application WO/2012/011205
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a method for separating and recovering nickel, cobalt and rare earth elements (RE) from positive- and negative-electrode active materials that constitute a nickel-hydrogen secondary battery. The above problem can be solved by a method wherein nickel, cobalt and RE are recovered in the form of a sulfide that contains both nickel and cobalt and an RE-containing sulfate form a material which contains positive- and negative-electrode active materials that constitute a nickel-hydrogen secondary battery, said method including the following three steps: (1) a leaching step of subjecting a material which contains positive- and negative-electrode active materials to mixing with a sulfuric acid solution and dissolving therein, and then separating the resultant system into a leachate and a residue; (2) an RE crystallization step of adding an alkali metal sulfate to the leachate to obtain both a precipitate of an RE composite sulfate mixture and a RE-free fluid; and (3) a sulfide raw material recovery step of adding a sulfurizing agent to the RE-free fluid and thereby separating the RE-free fluid into a nickel/cobalt sulfide raw material and a residual fluid.
Inventors:
KIKUTA NAOKO (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
Application Number:
PCT/JP2010/070370
Publication Date:
January 26, 2012
Filing Date:
November 16, 2010
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
KIKUTA NAOKO (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
KIKUTA NAOKO (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
International Classes:
C22B7/00; C22B23/00; C22B23/06; C22B59/00; H01M10/54
Foreign References:
| JP2002241856A | 2002-08-28 | |||
| JPS5489904A | 1979-07-17 | |||
| JPH0681050A | 1994-03-22 | |||
| JP2006144102A | 2006-06-08 | |||
| JP2010037626A | 2010-02-18 | |||
| JP2003041326A | 2003-02-13 | |||
| JPH0982371A | 1997-03-28 | |||
| JP2010126779A | 2010-06-10 | |||
| JP3918041B2 | 2007-05-23 |
Other References:
MASAYUKI YOSHIO ET AL.: "Lithium Ion Niji Denchi -Zairyo to Oyo", 29 March 1996, THE NIKKAN KOGYO SHINBUN, LTD., pages: 164 - 165, XP008169490
See also references of EP 2597164A4
See also references of EP 2597164A4
Attorney, Agent or Firm:
OSHIDA Yoshitaka (JP)
Yoshitaka Oshida (JP)
Yoshitaka Oshida (JP)
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