Title:
METHOD FOR RECOVERING RARE EARTH ELEMENT
Document Type and Number:
WIPO Patent Application WO/2015/147181
Kind Code:
A1
Abstract:
The problem addressed by the present invention is to provide a method for separating and recovering a rare earth element as an oxide from iron group elements by moving a treatment environment into the presence of carbon and carrying out heat treatment after carrying out an oxidation process on a processing target that includes at least the rare earth element and an iron group element, wherein the method is low-cost and whereby an oxide of a rare earth element can be efficiently separated from iron group elements and processing containers can be used repeatedly over a long period of time suppressing consumption and loss of the processing containers. This method, which is a means for addressing the problem, is characterized by mixing the processing target that has undergone oxidation processing with petroleum coke as a source for supplying carbon and accommodating the mixture in a processing container, and by carrying out heat treatment at a temperature of 950 - 1150°C (not including 1150°C) in an inert gas atmosphere or in a vacuum.
Inventors:
HOSHI HIROYUKI (JP)
MIYAMOTO YU (JP)
MIYAMOTO YU (JP)
Application Number:
PCT/JP2015/059413
Publication Date:
October 01, 2015
Filing Date:
March 26, 2015
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22B59/00; B09B3/00; B09B5/00; C22B1/02; C22B7/00
Domestic Patent References:
WO2013018710A1 | 2013-02-07 | |||
WO2010098381A1 | 2010-09-02 | |||
WO2014104205A1 | 2014-07-03 |
Foreign References:
JP2005002463A | 2005-01-06 | |||
JP2012041588A | 2012-03-01 | |||
JP2004091811A | 2004-03-25 |
Other References:
See also references of EP 3124629A4
Attorney, Agent or Firm:
TSUJITA Takashi et al. (JP)
Yukifumi Tsujita (JP)
Yukifumi Tsujita (JP)
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