Title:
METHOD FOR PRODUCING HIGH-PURITY NICKEL SULFATE
Document Type and Number:
WIPO Patent Application WO/2013/077296
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for producing a high-purity nickel sulfate with less impurities, especially with less magnesium or less chlorides by regulating the concentration of the extractant and the pH concentration during the processing in a step for obtaining a nickel sulfate solution with high nickel concentration by means of solvent extraction using an acidic organic extractant.
A method for producing a high-purity nickel sulfate, which is characterized by processing an acidic solution containing nickel through at least the following steps: a sulfurization step wherein a sulfurizing agent is added into the acidic solution containing nickel, thereby obtaining a sediment of a nickel sulfide and a liquid after sulfurization; a redissolving step wherein a slurry of the nickel sulfide obtained in the sulfurization step is prepared and an oxidant is added into the slurry, thereby obtaining a concentrated solution of nickel; a liquid cleaning step wherein the concentrated solution of nickel obtained in the redissolving step is neutralized by adding a neutralizing agent thereto, thereby obtaining a neutralization sediment and a concentrated solution of nickel after deironization; and a solvent extraction step wherein the concentrated solution of nickel after deironization obtained in the liquid cleaning step is subjected to solvent extraction, thereby obtaining a back extraction liquid and a nickel sulfate solution.
Inventors:
NAKAI TAKAYUKI (JP)
HIGAKI TATSUYA (JP)
OZAKI YOSHITOMO (JP)
HIGAKI TATSUYA (JP)
OZAKI YOSHITOMO (JP)
Application Number:
PCT/JP2012/079985
Publication Date:
May 30, 2013
Filing Date:
November 19, 2012
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C22B23/00; C01G53/10; C22B3/26; C22B3/44; C22B7/00; H01M10/54
Foreign References:
| JP2004307270A | 2004-11-04 | |||
| JPH1060552A | 1998-03-03 | |||
| JP2002326820A | 2002-11-12 | |||
| JP2002121624A | 2002-04-26 | |||
| JP2005350766A | 2005-12-22 | |||
| JPH10310437A | 1998-11-24 | |||
| JPH1030135A | 1998-02-03 |
Other References:
See also references of EP 2784166A4
Attorney, Agent or Firm:
OSHIDA Yoshitaka (JP)
Yoshitaka Oshida (JP)
Yoshitaka Oshida (JP)
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Claims: