For the recovery of uranium from spent nuclear fuel, sulfide reprocessing process, which consists of voloxidation, selective sulfurization, and magnetic separation or selective dissolution steps, are proposed. In this paper selective sulfurization of rare-earth oxides in the presence of uranium oxides was studied by thermogravimetry and X-ray diffractometry. In case of the mixture with UO2, the rare earth oxides R2O3 (R=Nd, Eu, etc.) were preferentially sulfurized by CS2 forming oxysulfides and sulfides, while UO2 remained at temperatures lower than 500°C. When R2O3 was mixed with U 3O8, first, the reduction of U3O8 to UO2 occurred at low temperatures followed by the sulfurization of R2O3. The separation of rare earth elements from UO 2 in suspension solution by the use of permanent magnet was examined. The advantage of the proposed process was also discussed by compared with current process.
|出版ステータス||Published - 2006 10月 6|
|イベント||2006 TMS Annual Meeting - San Antonio, TX, United States|
継続期間: 2006 3月 12 → 2006 3月 16
|Other||2006 TMS Annual Meeting|
|City||San Antonio, TX|
|Period||06/3/12 → 06/3/16|
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