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1. 发明公开

EP3524700A1 HYDROMETALLURGICAL METHOD FOR REFINING NICKEL OXIDE ORE 审中-公开
公开(公告)号：EP3524700A1
公开(公告)日：2019-08-14
申请号：EP17858474.4
申请日：2017-10-05
申请人： Sumitomo Metal Mining Co., Ltd.
发明人： MIYAMOTO Takashi , SHIBAYAMA Keisuke
IPC分类号： C22B23/00
摘要： Disclosed herein is a hydrometallurgical method for refining nickel oxide ore in which a filtration device is prevented from being quickly clogged to improve production efficiency.
The hydrometallurgical method for refining nickel oxide ore includes: a leaching step in which nickel oxide ore is subjected to acid leaching under high pressure; a solid-liquid separation step in which an obtained leach slurry is washed and then subjected to solid-liquid separation to obtain a leachate containing the nickel; a neutralization step in which a neutralizer and a flocculant are added to the leachate to obtain a neutralized precipitate, and then the neutralized precipitate is separated by solid-liquid separation from a post-neutralization solution containing nickel; a dezincification step in which a sulfurizing agent is added to the post-neutralization solution to obtain a slurry containing zinc sulfide, and the slurry is subjected to solid-liquid separation to obtain the zinc sulfide and a post-dezincification solution; and a nickel recovery step in which a sulfurizing agent is added to the post-dezincification solution to obtain a mixed sulfide containing the nickel, and the mixed sulfide is separated by solid-liquid separation from a post-sulfurization solution, wherein an amount of the neutralizer added is adjusted so that a Fe concentration of the post-neutralization solution obtained in the neutralization step is 1.25 g/L or less.

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