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Title:
AQUEOUS COBALT CHLORIDE SOLUTION PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2016/194659
Kind Code:
A1
Abstract:
[Problem] To provide an aqueous cobalt chloride solution purification method capable of efficiently removing impurities from a cobalt salt solution. [Solution] A method for bringing metallic nickel into contact with an aqueous cobalt chloride-containing solution to remove impurities by a cementation reaction, wherein the metallic nickel is washed with an acidic solution of pH 2.5 or less prior to bringing the metallic nickel into contact with the aqueous cobalt chloride-containing solution. Since the metallic nickel is washed with an acidic solution of pH 2.5 or less, the passive film on the surface of the metallic nickel is removed. Since the passive film has been removed, when the metallic nickel is brought into contact with the aqueous cobalt chloride-containing solution, impurities that are more electropositive than metallic nickel can be precipitated by a cementation reaction. Moreover, since the metallic nickel need only be washed with acid and brought into contact with the aqueous cobalt chloride-containing solution, it is possible to remove impurities from the aqueous cobalt chloride-containing solution easily.

Inventors:
OHARA HIDEKI (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
TAN TOSHIROU (JP)
Application Number:
JP2016/065046
Publication Date:
December 08, 2016
Filing Date:
May 20, 2016
Export Citation:
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Assignee:
SUMITOMO METAL MINNING CO LTD (JP)
International Classes:
C22B23/06; C01G51/08; C22B3/46; C22B23/00; H01M4/525
Foreign References:
JPH1180986A1999-03-26
JPS5743628B21982-09-16
JP2000067862A2000-03-03
JP2013194269A2013-09-30
Other References:
See also references of EP 3305923A4
Attorney, Agent or Firm:
NAKAI Hiroshi et al. (JP)
Hiroshi Nakai (JP)
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