1995 Fiscal Year Final Research Report Summary
Development of continuous separation system for rare earth with solvent impregnated resin
| Project/Area Number |
06555315
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
資源開発工学
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| Research Institution | Kansai University |
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Principal Investigator |
SHIBATA Junji Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (70067742)
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| Co-Investigator(Kenkyū-buntansha) |
IMANISHI Nobuyuki Shinko Research Company, Research and Development Section Senior Manager, 調査研究部長
MACHIDA Junichi Santoku Metal Industry Co., LTD,Quality Control Section, Section Manager, 品質管理課, 課長代理
SANO Makoto Kansai University, Faculty of Engineering, Researcher Assistant, 工学部, 助手 (00170811)
西村 山治 関西大学, 工学部, 教授 (30067467)
SANO Makoto Kansai University, Faculty of Engineering, Professor
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| Project Period (FY) |
1994 – 1995
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| Keywords | solvent impregnated resin / extractant / column method / separation / adsorption / rare earth |
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| Research Abstract |
Investigation of a batch and a column solvent impregnated resin process was carried out for the separation of rare earth. Furthermore, the separation process of Dy.Y.Tm, and Yb from the heavy rare earth residue containing seven components was developed as an application. The results obtained are summarized as follows ;
1) Measurement of pore diameter distribution and specific surface area of the impregnated resin proved physical adsorption of PC-88A in the pore of the porous resin. Amberlite XAD-7.
2) The impregnated resin can recycle 20 times from the results of ageing test.
3) Adsorption of rare earth with the impregnated resin takes place by the cation exchange reaction between metal ion in the solution and hydrogen ion of PC-88A.There is little difference in adsorption speed between the impregnated resin adn commercial cation exchange resins. Elution is operated easily with inorganic acid such as hydrochloric acid.
4) Optinum conditions for the separation were obtained by adsorption an
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d elution experiments at various diameters and heights of the column. It is possible to apply the impregnated resin to the treatment of a large amount of waste solution using longer diameter of column and there is strong relationship between separationability and column height.
5) It was found from a column separation test that rare earth with the smaller atomic number is recovered in the adsorption step, while rare earth with the larger atomic number is recovered in the elution step in the case of binary solutions, such as Nd/Sm and Tb/Ho.
6) The detector to catch a breakthrough point was develped by us and the detector made it possible to find the exact breakthrough point by measurement of visible and ultra violet absorbance of proper wave length. We designed the detector system and completed the system of decision of a breakthrough point.
7) We established the process in which Dy, Y,Tm, and Yb are separated from the leaching solution of heavy rare earth residue and accomplished the almost perfect recovery of Dy, Y,Tm and Yb at various concentrations of hydrochloric acid (pH2-pH0) as an eluent using a development-coulumn at elution process. Less
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