METHOD FOR RARE-EARTH ELEMENT RECOVERY

WIPO Patent Application WO/2013/146472

A1

Recovery of multiple types of rare-earth elements from a raw material containing non-rare-earth elements is performed simply and at a lower cost. A rare-earth element recovery method for extracting specified rare-earth elements from a raw-material solution containing at least one type of rare-earth element and a non-rare-earth element, including a first extraction step for obtaining a first solution containing at least one rare-earth element from a raw-material solution using a solvent extraction method, and a second extraction step for obtaining a second solution including specified rare-earth elements from the first solution using a solvent extraction method. By using a solvent extraction method in the first extraction step, compared with using a precipitation-separation method, large amounts of pH-adjustment chemicals are not required, and cost can be reduced for the recovery of the rare-earth elements. Also, compared with the precipitation method, which requires multiple repetitions of an operation, namely pH adjustment/precipitation recovery, the amount of operations is greatly reduced, and the steps are simplified.

TAKAHASHI KYOSUKE (JP)
UENO NORIEDA (JP)
SUZUKI TETSUSHI (JP)
AGAWA RYUICHI (JP)
SADAOKA YOSHIHIKO (JP)

PCT/JP2013/057831

October 03, 2013

March 19, 2013

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SUMITOMO HEAVY INDUSTRIES (JP)

C22B59/00; C22B3/20

JP2011001583A	2011-01-06
JP2011001584A	2011-01-06
JP2011001586A	2011-01-06
JPH0280530A	1990-03-20
JPH05105975A	1993-04-27

HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)

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