Title:
SILVER POWDER AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/133103
Kind Code:
A1
Abstract:
Provided is a silver powder production method which enables the production of a silver powder having uniform particle diameters with high productivity. The present invention is a silver powder production method, in which the silver powder is produced by mixing a silver solution containing a silver complex with a reducing agent solution continuously to produce a reaction solution, reducing the silver complex in the reaction solution to produce a silver particle slurry, and subjecting the slurry to a filtration step, a washing step and then a drying step. The method comprises: a silver core solution preparation step (S1) of mixing a silver-complex-containing silver solution for core production purposes, a solution containing a strongly reducing agent and a dispersing agent together to prepare a silver core solution; a core-containing reducing agent solution preparation step (S2) of mixing the resultant silver core solution with a weakly reducing agent that has a higher standard electrode potential than that of the strongly reducing agent to prepare a core-containing reducing agent solution; and a particle growth step (S3) of mixing the core-containing reducing agent solution with a silver-complex-containing silver solution for particle growth purposes continuously to produce a reaction solution and reducing the silver complex in the reaction solution, thereby growing silver particles.
Inventors:
NISHIMOTO MASAMU (JP)
OKABE YOSHIHIRO (JP)
KANADA SATOSHI (JP)
OKABE YOSHIHIRO (JP)
KANADA SATOSHI (JP)
Application Number:
PCT/JP2013/055134
Publication Date:
September 12, 2013
Filing Date:
February 27, 2013
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
NISHIMOTO MASAMU (JP)
OKABE YOSHIHIRO (JP)
KANADA SATOSHI (JP)
NISHIMOTO MASAMU (JP)
OKABE YOSHIHIRO (JP)
KANADA SATOSHI (JP)
International Classes:
B22F9/24; B22F1/00; B22F1/05
Foreign References:
| JP2009140788A | 2009-06-25 | |||
| JPH10317022A | 1998-12-02 | |||
| JP2008527169A | 2008-07-24 | |||
| JP2010225575A | 2010-10-07 | |||
| JP2007270312A | 2007-10-18 |
Attorney, Agent or Firm:
KOIKE, Akira et al. (JP)
Akira Koike (JP)
Akira Koike (JP)
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Claims: