Invention Grant
- Patent Title: Method for producing hematite for ironmaking
- Patent Title (中): 用于生产炼铁的赤铁矿的方法
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Application No.: US14386172Application Date: 2013-01-16
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Publication No.: US09255013B2Publication Date: 2016-02-09
- Inventor: Hideki Sasaki , Yoshitomo Ozaki , Manabu Enomoto , Hirofumi Shouji , Tatsuya Higaki , Hiroyuki Mitsui , Yasumasa Kan
- Applicant: Sumitomo Metal Mining Co., Ltd.
- Applicant Address: JP
- Assignee: Sumitomo Metal Mining Co., Ltd.
- Current Assignee: Sumitomo Metal Mining Co., Ltd.
- Current Assignee Address: JP
- Agent Gerald E. Hespos; Michael J. Porco; Matthew T. Hespos
- Priority: JP2012-062793 20120319
- International Application: PCT/JP2013/050669 WO 20130116
- International Announcement: WO2013/140836 WO 20130926
- Main IPC: C01G49/00
- IPC: C01G49/00 ; C01G49/06 ; C22B3/44

Abstract:
Provided is a method for producing hematite for ironmaking, wherein high purity hematite, which can be used as an iron-making raw material, is cheaply and efficiently recovered from a leach residue containing iron oxide produced by a high pressure acid leach (HPAL) process. This method for producing (high purity) hematite for ironmaking in a process of adding a mineral acid and an oxidant to ore containing iron and valuable metals and then leaching the valuable metals under high pressure and high temperature includes (1) a neutralization step of adding a neutralizer to a leachate obtained under high pressure and high temperature to form a leach slurry, (2) a solid-liquid separation step of separating the leach slurry obtained in the neutralization step (1) into a leach residue and the leachate, and (3) a classification step of classifying the leach residue into the hematite and gangue components.
Public/Granted literature
- US20150023851A1 METHOD FOR PRODUCING HEMATITE FOR IRONMAKING Public/Granted day:2015-01-22
Information query
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