METHOD FOR RECOVERING RARE EARTH ELEMENT

Japanese Patent JP2015110811

A

PROBLEM TO BE SOLVED: To provide, when recovering a rare earth element by a sulfuric acid double salt precipitation method, a method which enables stable recovery of the rare earth element even when a scale of execution of the rare earth element recovery is expanded.SOLUTION: After a sulfuric acid double salt generating reaction is completed, a solution obtained is stirred in a state where precipitation of rare earth sulfuric acid double salt does not occur, and materials other than a solution containing a specified amount of the precipitation of the rare earth sulfuric acid double salt are recovered by passage though a solid-liquid separator. Subsequently, the solution containing the specified amount of the precipitation of the rare earth sulfuric acid double salt is allowed to stand still to precipitate the rare earth sulfuric acid double salt, and thereafter a supernatant liquid is removed and the precipitation of the rare earth sulfuric acid double salt is allowed to remain in a reaction tank. Then, in coexistence of the rare earth sulfuric acid double salt precipitation as seed crystals, an alkali metal sulfate is added to form a slurry and thereafter a solution containing the rare earth element is introduced to carry out the sulfuric acid double salt forming reaction.

ISHIDA HITOSHI
MANO TAKUMI

JP2013247487A

June 18, 2015

November 29, 2013

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SUMITOMO METAL MINING CO

C22B59/00; C22B7/00; C22B13/00; C22B15/00; C22B19/20; C22B23/00; C22B26/12

JP2012229483A	2012-11-22
JP2013104098A	2013-05-30
JP2013256693A	2013-12-26
JP2012229483A	2012-11-22
JP2013104098A	2013-05-30
JP2013256693A	2013-12-26

Akira Koike
Seiji Iga
Toshiya Fujii

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