Sumitomo Metal Mining Company, Ltd.

Ryo-ma Yamaguma

Yoshitomo Ozaki

Shin-ichi Heguri

Kazuyuki Takaishi

Yasuo Doi

A nickel sulfate amine complex liquid and nickel powder having a particle diameter of 0.1 &#x3bc;m to 300 &#x3bc;m are supplied to a reaction container, hydrogen gas is continuously supplied while the inside of the reaction container is maintained at 150&#xb0; C. to 250&#xb0; C., and the pressure is set to 2.5 MPa to 3.5 MPa, whereby nickel ions in the nickel sulfate amine complex liquid are reduced to nickel and deposited on the surfaces of the nickel powder supplied to the reaction container, a reacted slurry including the nickel sulfate amine complex liquid and the nickel powder is then transferred to a pressurized storage container at the same or slightly lower pressure than the internal pressure of the reaction container, and the pressure of the pressurized storage container to which the reacted slurry is transferred is then reduced, after which the reacted slurry is extracted from the pressurized storage container.

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Niihama, Japan

Ryo-ma Yamaguma