Title:
METHOD FOR PRODUCING COBALT SULFATE
Document Type and Number:
WIPO Patent Application WO/2022/269962
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 method involves sequentially performing: a copper removal step (S1) for adding a sulfurizing agent to a cobalt chloride solution containing at least one impurity selected from among copper, zinc, manganese, calcium, and magnesium to produce a precipitate of a sulfide of copper and separate and remove copper; a neutralization step (S2) for adding a neutralizing agent or a carbonizing agent to the cobalt chloride solution, which has been subjected to the copper removal step (S1), to produce cobalt hydroxide or basic cobalt carbonate and separate magnesium; and a leaching step (S3) for adding sulfuric acid to the cobalt hydroxide or basic cobalt carbonate to obtain a cobalt sulfate solution; and a solvent extraction step (S4) for bringing an organic solvent containing an alkylphosphoric acid-based extractant into contact with the cobalt sulfate solution to extract zinc, manganese, and calcium into the organic solvent and separate and remove zinc, manganese, and calcium. The addition of the neutralizing agent or the carbonizing agent in the neutralization step (S2) is performed by a countercurrent flow multistage process.
Inventors:
OHARA HIDEKI (JP)
KUDOU KEIJI (JP)
HIGAKI TATSUYA (JP)
WATANABE HIROTO (JP)
KONDOU NATSUKI (JP)
KANEKO TAKASHI (JP)
HEGURI SHIN-ICHI (JP)
KUDOU KEIJI (JP)
HIGAKI TATSUYA (JP)
WATANABE HIROTO (JP)
KONDOU NATSUKI (JP)
KANEKO TAKASHI (JP)
HEGURI SHIN-ICHI (JP)
Application Number:
PCT/JP2022/001899
Publication Date:
December 29, 2022
Filing Date:
January 20, 2022
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C01G51/10; C22B3/08; C22B3/38; C22B3/44; C22B23/00
Foreign References:
| JP2014029006A | 2014-02-13 | |||
| JP2017226568A | 2017-12-28 | |||
| CN111910075A | 2020-11-10 | |||
| JP2004285368A | 2004-10-14 | |||
| JP2001020021A | 2001-01-23 | |||
| JP2020019664A | 2020-02-06 |
Other References:
See also references of EP 4163257A4
Attorney, Agent or Firm:
YAMAUCHI PATENT ATTORNEYS (JP)
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