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Title:
RARE EARTH EXTRACTING AGENT, AND RARE EARTH EXTRACTION METHOD
Document Type and Number:
WIPO Patent Application WO/2015/022843
Kind Code:
A1
Abstract:
Provided is a rare earth extracting agent which can extract a rare earth selectively even in a low pH range. The rare earth extracting agent according to the present invention comprises a diketone and a neutral extracting agent. The diketone is preferably 2-thenoyltrifluoroacetone, the neutral extracting agent is preferably a compound having a phosphine oxide group, and the compound is preferably trioctylphosphine oxide. In order to extract a rare earth using the rare earth extracting agent according to the present invention, an acidic solution containing the rare earth is subjected to solvent extraction. When it is intended to collect various types of rare earth elements with high yield, it is preferred to adjust the pH value of the acidic solution to 0.2 to 2.6 inclusive. When it is intended to collect only scandium from various types of rare earth elements with high yield and with high purity, it is preferred to adjust the pH value of the acidic solution to 0.2 to 1.0 inclusive.

Inventors:
GOTO MASAHIRO (JP)
KUBOTA FUKIKO (JP)
Application Number:
PCT/JP2014/069401
Publication Date:
February 19, 2015
Filing Date:
July 23, 2014
Export Citation:
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Assignee:
UNIV KYUSHU NAT UNIV CORP (JP)
SUMITOMO METAL MINING CO (JP)
International Classes:
C22B59/00; C22B3/26
Foreign References:
JPH11140556A1999-05-25
JP2000313928A2000-11-14
JPS6428217A1989-01-30
JPS6414113A1989-01-18
Other References:
D.I.T.FAVARO ET AL.: "Interaction effect between thenoyltrifluoroacetone and tri-n-octylphoshine oxide in the synergistic extraction of trivalent lanthanides. Determination of the composition of the extracted species of the extracted species", JOURAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol. 111, no. 1, April 1987 (1987-04-01), pages 81 - 94
SHIN'ICHIRO YORIKUNI ET AL.: "Synergistic extraction of lanthanoids(III) with 2-thenoyltrifluoroacetone and triphenylphosphine oxide and hydration of the extracted species", JOURNAL OF JAPAN SOCIETY FOR ANALYTICAL CHEMISTRY, vol. 52, no. 9, 5 September 2003 (2003-09-05), pages 805 - 810
JUNJI NORO ET AL.: "Solvent Extraction of Scandium(III) with Hexafluoroacetylacetone into Chloroform in the Absence and Presence of Tetrabutylammonium Ions or Trioctylphosphine Oxide", BULL.CHEM.SOC.JPN., vol. 66, no. 11, November 1993 (1993-11-01), pages 3516 - 3519
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
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