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Impact of hydrothermal treatment of FEBEX and MX80 bentonites in water, HNO3 and Lu(NO3)3 media: Implications for radioactive waste control

Opened Access Impact of hydrothermal treatment of FEBEX and MX80 bentonites in water, HNO3 and Lu(NO3)3 media: Implications for radioactive waste control

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Autor: Alba Carranza, María Dolores
Pavón González, Esperanza
Cota Reguero, Agustín
Chain Villar, Pablo
Osuna, Francisco J.
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2015
Publicado en: Applied Clay Science, 118, 48-55.
Tipo de documento: Artículo
Resumen: Engineered barriers of deep geological repositories (DGR) are commonly constructed with bentonite. FEBEX and MX80 bentonites have been selected by different countries as reference materials for the sealing of repositories; however, their chemical reactivity with high-level long-lived radioactive wastes (HLRW) under subcritical conditions had not been explored before. The hydrothermal stability in neutral and acid media and chemical reactivity in contact with an actinide analogous compound were both studied. The long-range and short-range structural changes were analyzed by X-ray diffraction, nuclear magnetic resonance and scanning electron microscopy. Both bentonites have exhibited a good stability in neutral and acid media and have generated a new phase immobilizing the actinide analogous compound. The extent of the chemical reaction is higher in MX80 bentonite than in FEBEX bentonite.
Cita: Alba Carranza, M.D., Pavón González, E., Cota Reguero, A., Chain Villar, P. y Osuna, F.J. (2015). Impact of hydrothermal treatment of FEBEX and MX80 bentonites in water, HNO3 and Lu(NO3)3 media: Implications for radioactive waste control. Applied Clay Science, 118, 48-55.
Tamaño: 806.2Kb
Formato: PDF

URI: https://hdl.handle.net/11441/72287

DOI: 10.1016/j.clay.2015.08.036

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