Title:
AQUEOUS COBALT CHLORIDE SOLUTION PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2016/194658
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 substitution reaction, wherein the pH of the aqueous cobalt chloride-containing solution is adjusted to 1.5 to 2.5. Since the pH of the aqueous cobalt chloride-containing solution is adjusted to 1.5 to 2.5, it is possible to effectively remove the passive film on the surface of the metallic nickel. When the passive film is removed and 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 substitution reaction. Moreover, since the metallic nickel need only be 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:
TAN TOSHIROU (JP)
TAKANO MASATOSHI (JP)
OHARA HIDEKI (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
OHARA HIDEKI (JP)
ASANO SATOSHI (JP)
Application Number:
PCT/JP2016/065045
Publication Date:
December 08, 2016
Filing Date:
May 20, 2016
Export Citation:
Assignee:
SUMITOMO METAL MINNING CO LTD (JP)
International Classes:
C22B23/06; C01G51/08; C22B3/46; C22B23/00; H01M4/525
Foreign References:
| JPH1180986A | 1999-03-26 | |||
| JPS5743628B2 | 1982-09-16 | |||
| JP2000067862A | 2000-03-03 | |||
| JP2013194269A | 2013-09-30 |
Attorney, Agent or Firm:
NAKAI Hiroshi et al. (JP)
Hiroshi Nakai (JP)
Hiroshi Nakai (JP)
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