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Immobilization of Uranium in the Al2O3 Matrixстатья
- Авторы: Kulemin V.V., Krasavina E.P., Gorbacheva M.P., Rumer I.A., Bessonov A.A., Krapukhin V.B., Kulyukhin S.A.
- Журнал: Radiochemistry
- Том: 63
- Номер: 5
- Год издания: 2021
- Издательство: Pleiades Publishing, Inc.
- Местоположение издательства: New York, USA
- Первая страница: 651
- Последняя страница: 657
- DOI: 10.1134/S1066362221050143
- Аннотация: The immobilization of uranium in the Al2O3 matrix was studied. For the modification of Al2O3 precursors containing 10 wt % UO2(NO3)(2) three methods were applied: 1) heating the precursor in air for 5 h at temperatures of 573, 973, and 1273 K, 2) treatment of the precursor with a 0.5 M solution of hydrazine hydrate (HH) for 2 h, drying to dry air moisture content at 383 K, followed by heating in air for 5 h at temperatures of 573, 973, and 1273 K, and 3) treatment of the precursor with a 2.0 M ammonia solution, followed by drying and heating, as in method (2). X-ray diffraction analysis of the synthesized composites revealed UO3 hydrates of various compositions after calcination of the materials to T similar to 600 K and U3O8 after calcination at T> 950 K. After 24 h of contact of the composites with H2O at 298 K, the leaching of uranium from the studied samples was similar to(10(-2)-10(-3)) g U/(g day) for the samples calcined at 383 and 573 K and similar to(10(-4)-10(-5)) g U/(g day) for those calcined at 973 and 1273 K.
- Добавил в систему: Кулюхин Сергей Алексеевич