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Patent Searching and Data


Title:
METHOD FOR PRODUCING HEMATITE FOR IRON PRODUCTION
Document Type and Number:
WIPO Patent Application WO/2013/140836
Kind Code:
A1
Abstract:
Provided is a method for producing hematite for iron production, whereby high purity hematite, which can be used as a raw material for producing iron, is cheaply and efficiently recovered from leach residue containing iron oxide produced by the high pressure acid leach (HPAL) process. This method for producing (high purity) hematite for iron production involves a process in which a mineral acid and an oxidizing agent are added to ore containing iron and valuable metals, and the valuable metals are leached at a high temperature and high pressure. Said method includes: (1) a neutralization step in which a neutralizer is added to leachate obtained at a high temperature and high pressure, forming a leach slurry; (2) a solid-liquid separation step in which the leach slurry obtained in the neutralization step (1) is separated into a leach residue and leachate; and (3) a classification step in which the leach residue obtained by solid-liquid separation is classified and separated into hematite and gangue components.

Inventors:
SASAKI HIDEKI (JP)
KAN YASUMASA (JP)
OZAKI YOSHITOMO (JP)
ENOMOTO MANABU (JP)
SHOUJI HIROFUMI (JP)
HIGAKI TATSUYA (JP)
MITSUI HIROYUKI (JP)
Application Number:
PCT/JP2013/050669
Publication Date:
September 26, 2013
Filing Date:
January 16, 2013
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C22B3/44; C22B1/00; C22B1/02; C22B3/00; C22B15/00; C22B23/00
Foreign References:
JP2010095788A2010-04-30
JPH06279881A1994-10-04
JP2011195920A2011-10-06
JP2007098187A2007-04-19
JP2011051850A2011-03-17
JP2010126778A2010-06-10
JP2008081766A2008-04-10
JP2007070708A2007-03-22
JP2009520661A2009-05-28
JP4294685B22009-07-15
Other References:
See also references of EP 2829621A4
Attorney, Agent or Firm:
OSHIDA Yoshitaka (JP)
Yoshitaka Oshida (JP)
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