Title:
希土類磁石から希土類元素を回収する方法
Document Type and Number:
Japanese Patent JP6460973
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method to collect rare earth elements from a rare earth magnet which can collect high-grade rare earth elements from a used rare earth magnet with high yield and cheap as possible.SOLUTION: A method to collect rare earth elements from a rare earth magnet includes: a first step soaking the rare earth magnet in water, adding nitric acid, keeping the temperature of the liquid in 50-95°C, dissolving the rare earth magnet and generating a solution; a second step adjusting the pH of the solution in 1.5-2.5, generating a ferrous compound by heating to 65-95°C, and collecting and washing supernatant liquid containing the rare earth magnet components; a third step extracting the rare earth magnet components in an organic phase by contacting the supernatant liquid with a solvent; and a forth step generating rare earth oxides by extracting the rare earth magnet components in a nitric acid phase from the organic phase and crystallizing and burning.SELECTED DRAWING: Figure 1
Inventors:
Keisuke Isomura
Yuu Segawa
Uchino Yuki
Hironari Asai
Aki Morimoto
Yuu Segawa
Uchino Yuki
Hironari Asai
Aki Morimoto
Application Number:
JP2015248853A
Publication Date:
January 30, 2019
Filing Date:
December 21, 2015
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
Sanwa Yuka Kogyo Co., Ltd.
Sanwa Yuka Kogyo Co., Ltd.
International Classes:
C22B59/00; C22B1/02; C22B3/06; C22B3/26; C22B3/44; C22B7/00
Domestic Patent References:
| JP9157769A | ||||
| JP2015042782A | ||||
| JP2014513212A | ||||
| JP55051721A | ||||
| JP2007327085A | ||||
| JP2013216656A | ||||
| JP3207825A |
Foreign References:
| WO2003078671A1 |
Attorney, Agent or Firm:
Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu
Sekiya Mitsuo
Ishikawa Takiharu