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1. (WO2018042684) SILVER POWDER PRODUCTION METHOD AND SILVER POWDER PRODUCTION APPARATUS

Pub. No.:    WO/2018/042684    International Application No.:    PCT/JP2016/081286
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Oct 22 01:59:59 CEST 2016
IPC: B22F 9/08
B22F 1/00
Applicants: DAIKEN CHEMICAL CO., LTD.
大研化学工業株式会社
Inventors: OGIHARA Takashi
荻原 隆
KUBO Toshihiko
久保 敏彦
MINAMI Kenji
南 健治
SATO Yasuaki
佐藤 靖朗
YASUDA Hirokazu
安田 宏和
AOYAGI Nobuyoshi
青柳 伸宜
HARADA Masahiro
原田 将弘
HARADA Akio
原田 昭雄
Title: SILVER POWDER PRODUCTION METHOD AND SILVER POWDER PRODUCTION APPARATUS
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.