1992 Fiscal Year Final Research Report Summary
Development of new oil-soluble complexing agents for separation of rare earth metals utilizing interface
| Project/Area Number |
03555203
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
反応工学
|
|---|
| Research Institution | KYUSHU UNIVERSITY |
|---|
Principal Investigator |
NAKASHIO Fumiyuki Kyushu University, Professor Faculty of Engineering, 工学部, 教授 (70037729)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TSUBOI Hikotada Mitsui-Cyanamid,Ltd.Mobara Research & Development, Director, 技術研究所, 所長
GOTO Masahiro Kyushu University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10211921)
|
|---|
| Project Period (FY) |
1990 – 1992
|
| Keywords | Rare Earth Metal / Extraction / Separation / Interface / Complexing Agent / Liquid Membrane / Surfactant / Hollow Fiber |
|---|
| Research Abstract |
Recently, efficient separation and purification of rare earth metals have been studied intensively in connection with the development of new advanced materials. Unique electronic optical and magnetic properties are obtained by utilizing ultra-purified rare earth metals. However, for preparation of high-purity produces, a large number of stages are needed because the chemical and physical properties of adjacent elements among the lanthanoids are very similar. Rare earth metals have thus the inherent disadvantage that their mutual separation is very difficult.
In this study, new oil-soluble complexing agents, which are polyaminocarboxylic acid alkylderivatives and have interfacial activity like that of surfactants have been developed. Separation of rare earth metal s utilizing their new agents were investigated using a hollow-fiber membrane extractor. (1) The extraction mechanism was clarified under the addition of new complexing agents. The experimental results could be explained by a diffusion model accompanied by an interfacial reaction. An EDTA-dioleylderivative gives the best result for the separation of rare earth metals. Among them, the new agent was much effective for separation of yttrium from heavier rare earth metals. (3) The selectivity in this study can be enhanced in a nonequilibrium state by utilizing the difference in interaction between the complexing agent and rare earth metal ions at the oil-water interface. The oil-water interface is very useful for separation of rare earth metals with solvent extraction.
|
