Title:
METHOD FOR SEPARATING AND RECOVERING RARE EARTH ELEMENTS
Document Type and Number:
WIPO Patent Application WO/2012/137727
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method whereby rare earth elements can be separated and recovered at a higher yield than by conventional techniques. The method for separating and recovering rare earth elements, whereby multiple kinds of rare earth elements are separated and recovered, comprises: a step for achieving chemical equilibrium among rare earth halides of rare earth elements of group 1 and rare earth oxyhalides of rare earth elements of group 2, by chemically reacting a mixture, said mixture containing halides of the multiple kinds of rare earth elements, in the presence of an oxygen source, or by chemically reacting a mixture, said mixture containing oxides of the multiple kinds of rare earth elements, in the presence of a halogen source; a step for pouring the rare earth halides and the rare earth oxyhalides into water to selectively dissolve the rare earth halides in water, and thus extracting the rare earth halides into a liquid phase while allowing the rare earth oxyhalides to remain as a solid phase; and a step for subjecting the liquid phase, which contains the rare earth halides extracted therein, and the solid phase of the remaining rare earth oxyhalides to solid/liquid separation to thereby separate the rare earth elements of group 1 from the rare earth elements of group 2.
Inventors:
YAMAMOTO HIROKI (JP)
FURUSAWA KATSUYOSHI (JP)
UDA TETSUYA (JP)
FURUSAWA KATSUYOSHI (JP)
UDA TETSUYA (JP)
Application Number:
PCT/JP2012/058914
Publication Date:
October 11, 2012
Filing Date:
April 02, 2012
Export Citation:
Assignee:
HITACHI LTD (JP)
YAMAMOTO HIROKI (JP)
FURUSAWA KATSUYOSHI (JP)
UDA TETSUYA (JP)
YAMAMOTO HIROKI (JP)
FURUSAWA KATSUYOSHI (JP)
UDA TETSUYA (JP)
International Classes:
C22B59/00; C01F17/259; C22B1/04; C22B3/04; C22B3/44
Domestic Patent References:
| WO2009119720A1 | 2009-10-01 |
Foreign References:
| JP2002536550A | 2002-10-29 |
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
Polaire Intellectual Property Corporation (JP)
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Claims: