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 (Sumitomo Metal Mining Co. Ltd. 17-5, Isoura-ch, Niihama-shi Ehime 02, 〒7920002, JP)
菊田 直子 (〒02 愛媛県新居浜市磯浦町１７番５号 住友金属鉱山株式会社 新居浜研究所内 Ehime, 〒7920002, JP)
ASANO Satoshi (Sumitomo Metal Mining Co. Ltd. 17-5, Isoura-ch, Niihama-shi Ehime 02, 〒7920002, JP)
菊田 直子 (〒02 愛媛県新居浜市磯浦町１７番５号 住友金属鉱山株式会社 新居浜研究所内 Ehime, 〒7920002, JP)
ASANO Satoshi (Sumitomo Metal Mining Co. Ltd. 17-5, Isoura-ch, Niihama-shi Ehime 02, 〒7920002, JP)
Application Number:
JP2010/070370
Publication Date:
January 26, 2012
Filing Date:
November 16, 2010
Export Citation:
Assignee:
SUMITOMO METAL MINING CO., LTD. (11-3, Shimbashi 5-chome Minato-k, Tokyo 16, 〒1058716, JP)
住友金属鉱山株式会社 (〒16 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058716, JP)
KIKUTA Naoko (Sumitomo Metal Mining Co. Ltd. 17-5, Isoura-ch, Niihama-shi Ehime 02, 〒7920002, JP)
菊田 直子 (〒02 愛媛県新居浜市磯浦町１７番５号 住友金属鉱山株式会社 新居浜研究所内 Ehime, 〒7920002, JP)
住友金属鉱山株式会社 (〒16 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058716, JP)
KIKUTA Naoko (Sumitomo Metal Mining Co. Ltd. 17-5, Isoura-ch, Niihama-shi Ehime 02, 〒7920002, JP)
菊田 直子 (〒02 愛媛県新居浜市磯浦町１７番５号 住友金属鉱山株式会社 新居浜研究所内 Ehime, 〒7920002, JP)
International Classes:
C22B7/00; C22B23/00; C22B23/06; C22B59/00; H01M10/54
Attorney, Agent or Firm:
OSHIDA Yoshitaka (Ginza bldg, 3-12 Ginza 3-chom, Chuo-ku Tokyo 61, 〒1040061, JP)
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