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Title:
PRODUCTION METHOD FOR COBALT SULFATE
Document Type and Number:
WIPO Patent Application WO/2022/224499
Kind Code:
A1
Abstract:
Provided is a method for producing high-purity cobalt sulfate by separating impurities and cobalt from a cobalt chloride solution containing impurities without using an electrolysis step.　The present invention involves sequentially executing: a first solvent extraction step (S1) for bringing an organic solvent containing an alkylphosphoric acid-based extraction agent into contact with a cobalt chloride solution containing impurities and extracting, from the solution, zinc, manganese, and calcium, by using the organic solvent to separate and remove the zinc, manganese, and calcium; a copper removal step (S2) for adding a sulfiding agent to the cobalt chloride solution and causing precipitation of copper sulfide to separate and remove the same; a second solvent extraction step (S3) for bringing an organic solvent containing a carboxylic acid extraction agent into contact with the cobalt chloride solution to extract cobalt therefrom by using the organic solvent, and thereafter, back-extracting cobalt using sulfuric acid to obtain a cobalt sulfate solution; and a step (S4) for crystallizing the cobalt sulfate solution obtained through the second solvent extraction step (S3). According to the present invention, high-purity cobalt sulfate can be directly produced by separating cobalt and impurities including magnesium, without using an electrolysis step.

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Inventors:
WATANABE HIROTO (JP)
OHARA HIDEKI (JP)
KUDOU KEIJI (JP)
KANEKO TAKASHI (JP)
HIGAKI TATSUYA (JP)
KONDOU NATSUKI (JP)
HEGURI SHIN-ICHI (JP)
Application Number:
PCT/JP2022/000255
Publication Date:
October 27, 2022
Filing Date:
January 06, 2022
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C01G51/10; B01D11/04; C22B3/32; C22B3/38; C22B3/44; C22B23/00
Foreign References:
JP2017226568A2017-12-28
JP2020019664A2020-02-06
JP2019143223A2019-08-29
JP2017186198A2017-10-12
JPH1150167A1999-02-23
JPS60231420A1985-11-18
JPS5719340A1982-02-01
JP2004285368A2004-10-14
JP2001020021A2001-01-23
JP2020019664A2020-02-06
Attorney, Agent or Firm:
YAMAUCHI PATENT ATTORNEYS (JP)
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