AQUEOUS COBALT CHLORIDE SOLUTION PURIFICATION METHOD

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.

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Inventors:

OHARA HIDEKI (JP)
ASANO SATOSHI (JP)
TAKANO MASATOSHI (JP)
TAN TOSHIROU (JP)

Application Number:

PCT/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:

JPH1180986A	1999-03-26
JPS5743628B2	1982-09-16
JP2000067862A	2000-03-03
JP2013194269A	2013-09-30

Other References: