Title:
MANUFACTURING METHOD FOR NICKEL POWDER
Document Type and Number:
WIPO Patent Application WO/2015/115427
Kind Code:
A1
Abstract:
Provided is a manufacturing method by which, using industrially inexpensive hydrogen gas, coarse grains of a high-purity nickel powder can be produced from a nickel ammine sulfate complex solution, employing a fine nickel powder. This manufacturing method for forming a nickel powder from a nickel ammine sulfate complex solution is characterized in that the process steps indicated by (1) to (4) are carried out: (1) a seed crystal production step for mixing a nickel sulfate solution and hydrazine, and producing a nickel powder having an average particle diameter of 0.1-5 μm to serve as seed crystals; (2) a seed crystal addition step for adding the nickel powder obtained in (1) to a nickel ammine sulfate complex solution, and forming a mixed slurry; (3) a reduction step for blowing hydrogen gas into the mixed slurry obtained in the seed crystal addition step, and forming a reduced slurry that includes a nickel powder in which the nickel component in the mixed slurry has precipitated onto the seed crystals; and (4) a growth step for subjecting the reduced slurry obtained in the reduction step to solid-liquid separation to separate the nickel powder as the solid phase component, and, after recovery thereof, blowing hydrogen gas into a solution of a nickel ammine sulfate complex solution added to the nickel powder, and growing the nickel powder, to form a high-purity nickel powder.
Inventors:
YANAGISAWA KAZUMICHI (JP)
ZHANG JUNHAO (JP)
HEGURI SHIN-ICHI (JP)
OHARA HIDEKI (JP)
IKEDA OSAMU (JP)
YONEYAMA TOMOAKI (JP)
KUDO YOHEI (JP)
OZAKI YOSHITOMO (JP)
ZHANG JUNHAO (JP)
HEGURI SHIN-ICHI (JP)
OHARA HIDEKI (JP)
IKEDA OSAMU (JP)
YONEYAMA TOMOAKI (JP)
KUDO YOHEI (JP)
OZAKI YOSHITOMO (JP)
Application Number:
PCT/JP2015/052205
Publication Date:
August 06, 2015
Filing Date:
January 27, 2015
Export Citation:
Assignee:
KOCHI UNIVERSITY NAT UNIVERSITY CORP (JP)
SUMITOMO METAL MINING CO (JP)
SUMITOMO METAL MINING CO (JP)
International Classes:
B22F9/26; B22F1/00; B22F3/10; B22F9/24
Foreign References:
| JPH10509213A | 1998-09-08 | |||
| JP2006152344A | 2006-06-15 | |||
| JP2005240164A | 2005-09-08 | |||
| JP2010242143A | 2010-10-28 | |||
| JP2005350766A | 2005-12-22 |
Other References:
POWDER METALLURGY, 1958, pages 40 - 52
See also references of EP 3100804A4
See also references of EP 3100804A4
Attorney, Agent or Firm:
OSHIDA Yoshitaka (JP)
Yoshitaka Oshida (JP)
Yoshitaka Oshida (JP)
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