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1. (WO2017038589) PROCESS FOR PRODUCING NICKEL POWDER

Pub. No.:    WO/2017/038589    International Application No.:    PCT/JP2016/074694
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: B22F 9/26
C22B 1/16
C22B 3/08
C22B 3/44
C22B 23/00
Applicants: SUMITOMO METAL MINING CO., LTD.
住友金属鉱山株式会社
Inventors: OZAKI Yoshitomo
尾崎 佳智
HEGURI Shin-ichi
平郡 伸一
Title: PROCESS FOR PRODUCING NICKEL POWDER
Abstract:
Provided is a production process by which a so-called high-purity nickel powder made up of coarse particles and reduced in the content of impurities, in particular, in sulfur content, is produced from a nickel sulfate ammine complex solution using a fine nickel powder. This process is for producing a nickel powder from a nickel sulfate solution, and is characterized by conducting the following treatment steps (1) to (4): (1) a hydroxylation step in which a sediment of nickel hydroxide is yielded; (2) a complexation step in which a mixed slurry comprising a nickel sulfate ammine complex solution, seed crystals, and the nickel hydroxide is formed; (3) a reduction step in which a reduction slurry containing a nickel powder formed by the deposition of nickel matter on the seed crystals is formed; and (4) a solid-liquid separation step in which the reduction slurry formed in the reduction step (3) is subjected to solid-liquid separation to recover the nickel powder and a reduction end liquid.