Title:
SELECTIVE STRIPPING AND SEPARATING METHOD FOR NEPTUNIUM
Document Type and Number:
Japanese Patent JP3099019
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To establish a method for selectively stripping and separating only neptunium from an organic solvent containing plutonium and uranium.
SOLUTION: In a dissolution process 1, used atomic fuel is dissolved by nitrate aqueous solution. In a co-decontamination process 2 after that, the nitrate aqueous solution is irradiated with ultraviolet rays, Np is oxidized, the valence is adjusted to VI value and U, Pu and Np are extracted by a tributyl phosphate (TBP) solvent. Then, in an Np separation process 3, the TBP solvent and the nitrate aqueous solution are mixed, only Np is reduced by irradiating the liquid mixture with the ultraviolet rays, the valence is adjusted to V value, it is made organic solvent non-extractable, and only Np is extracted to the nitrate aqueous solution and separated. By separating the remaining U and Pu in a distribution process 4, the respective ones of U, Pu and Np are separated and refined at high purity.
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| WO/2001/074275 | URINATION APPARATUS |
Inventors:
Yukio Wada
Satoshi Sasaki
Hiroshi Tomiyasu
Satoshi Sasaki
Hiroshi Tomiyasu
Application Number:
JP24537697A
Publication Date:
October 16, 2000
Filing Date:
September 10, 1997
Export Citation:
Assignee:
Nuclear Fuel Cycle Development Organization
Tokyo Institute of Technology
Tokyo Institute of Technology
International Classes:
G01N1/10; B01D11/04; G01N31/00; G21C19/46; (IPC1-7): G01N31/00; B01D11/04; G01N1/10; G21C19/46
Other References:
【文献】日本原子力学会 1997年(第35回)春の年会 要旨集 第▲III▼分冊514頁
Attorney, Agent or Firm:
Yoshiki Hasegawa (3 outside)