SILVER POWDER PRODUCTION METHOD AND SILVER POWDER PRODUCTION APPARATUS

Title:

SILVER POWDER PRODUCTION METHOD AND SILVER POWDER PRODUCTION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2018/042684

Kind Code:

A1

Abstract:

[Problem] To provide a silver powder production method and silver powder production apparatus with which silver powder of high purity and high electric conductivity can be produced stably and at low cost. [Solution] Molten silver 6 flows down from a nozzle 2 for molten metal in the form of a molten silver rod 61. Water that is sprayed from a circular spray nozzle 3 toward a first convergence section 34 along a path approximating an inverted cone surface atomizes the molten silver 6 in the first convergence section 34 to form silver particles 62. The water that has passed through the first convergence section 34 advances along a path approximating a cone surface, is reflected at a first circular section 53 of the inner surface of an axially symmetric suction tube 52 and advances toward a second convergence section 37 along a second path approximating an inverted cone surface. At the second convergence section 37, the water atomizes the molten silver 6 that was not atomized in the first convergence section 34 to form more silver particles 62. The diameter and length of the suction tube 52 are set so that the second convergence section 37 is located above the lower end of the suction tube 52, and the angle θ of the path approximating an inverted cone surface is set to be 25° to 30°, preventing the occurrence of blocking.

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Inventors:

OGIHARA TAKASHI (JP)
KUBO TOSHIHIKO (JP)
MINAMI KENJI (JP)
SATO YASUAKI (JP)
YASUDA HIROKAZU (JP)
AOYAGI NOBUYOSHI (JP)
HARADA MASAHIRO (JP)
HARADA AKIO (JP)

Application Number:

PCT/JP2016/081286

Publication Date:

March 08, 2018

Filing Date:

October 21, 2016

Export Citation:

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Assignee:

DAIKEN CHEMICAL CO LTD (JP)

International Classes:

B22F9/08; B22F1/00

Foreign References:

JPH059513A	1993-01-19
CN101992301A	2011-03-30
JP2007291454A	2007-11-08
JPH01123012A	1989-05-16

Attorney, Agent or Firm:

MIKI Hisami (JP)

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