Title:
高純度塩化コバルト水溶液の製造方法
Document Type and Number:
Japanese Patent JP7070209
Kind Code:
B2
Abstract:
To provide an efficient production method of a high purity cobalt chloride aqueous solution of a low Mg concentration.SOLUTION: The production method of a high purity cobalt chloride aqueous solution is comprised of a solvent extraction step S1 and solution cleaning steps S2-S4. The solvent extraction step S1 is comprised of an extraction stage S11 of mixing an amine-based extraction agent in a nickel chloride aqueous solution containing Co and MG and thus extracting Co into an organic phase to obtain a nickel chloride aqueous solution without Co, a washing stage S12 of washing the organic phase with a washing fluid, and a back extraction stage S13 of back extracting the organic phase after the washing to obtain a crude cobalt chloride aqueous solution. In the solution cleaning steps S2-S4, impurities are removed by adding cobalt carbonate slurry or the like to a mixture of the crude cobalt chloride aqueous solution and the cobalt chloride aqueous solution containing Mg. The high purity cobalt chloride aqueous solution obtained in the solution cleaning steps S2-S4 is supplied to an electrolysis step S5. An electrolysis waste solution discharged from the electrolysis step S5 is distributed to a solution for the washing fluid, a solution for a raw material for producing the cobalt carbonate, and a solution to be concentrated by evaporation for feeding to the electrolysis step. A part of the high purity cobalt chloride aqueous solution is used for repulping the produced cobalt carbonate.SELECTED DRAWING: Figure 1
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Inventors:
Akiko Fuji
Eiichi Nakagawa
Jiro Hayada
Eiichi Nakagawa
Jiro Hayada
Application Number:
JP2018143224A
Publication Date:
May 18, 2022
Filing Date:
July 31, 2018
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
C01G51/08; B01D11/04; B01J41/07; B01J47/02; C01G51/06; C02F1/04; C02F1/62; C22B3/28; C22B3/42; C22B3/44; C22B23/00; C25C1/08; C25C7/06
Attorney, Agent or Firm:
Norihisa Tsujikawa
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