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Title:
HEAVY RARE EARTH ELEMENT RECOVERY METHOD
Document Type and Number:
WIPO Patent Application WO/2014/115876
Kind Code:
A1
Abstract:
 The present invention addresses the issue of providing a method for recovering heavy rare earth elements from a subject to be processed that includes at least heavy rare earth elements and iron group elements, the method being able to be implemented as a low cost and simple recycling system. The method according to the present invention for recovering heavy rare earth elements from a subject to be processed that includes at least heavy rare earth elements and iron group elements is characterised in that the method at least includes a step in which, after the subject to be processed has been subjected to an oxidation treatment, or after the subject to be processed has been mixed with a R-Fe-B magnet alloy that has been subjected to an oxidation treatment, the subject to be processed is heat treated at a temperature of at least 1000°C in the presence of carbon, and thus heavy rare earth elements are separated, as oxides, from the iron group elements.

Inventors:
MIYAMOTO YU (JP)
HOSHI HIROYUKI (JP)
KIKUGAWA ATSUSHI (JP)
Application Number:
PCT/JP2014/051696
Publication Date:
July 31, 2014
Filing Date:
January 27, 2014
Export Citation:
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Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22B59/00; B09B3/00; C22B1/02; C22B7/00; C22B9/10
Domestic Patent References:
WO2010098381A12010-09-02
WO2012008426A12012-01-19
WO2013018710A12013-02-07
WO2012008426A12012-01-19
WO2010098381A12010-09-02
Foreign References:
JP2012041588A2012-03-01
JP2009249674A2009-10-29
Other References:
NAKAMOTO MASASHI ET AL.: "Extraction of Rare Earth Elements as Oxides from a Neodymium Magnetic Sludge", METALLURGICAL AND MATERIALS TRANSACTIONS B, vol. 43, no. 3, June 2012 (2012-06-01), pages 468 - 476, XP035055724
Attorney, Agent or Firm:
TSUJITA Takashi et al. (JP)
Yukifumi Tsujita (JP)
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