Article
Impact of hydrothermal treatment of FEBEX and MX80 bentonites in water, HNO3 and Lu(NO3)3 media: Implications for radioactive waste control
Author/s | Alba Carranza, María Dolores
Pavón González, Esperanza Cota Reguero, Agustín Chain Villar, Pablo Osuna, Francisco J. |
Department | Universidad de Sevilla. Departamento de Química Inorgánica |
Publication Date | 2015 |
Deposit Date | 2018-04-10 |
Published in |
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Abstract | 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; ... 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. |
Project ID. | 291780
0079000237 P12-FQM-567 |
Citation | 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. |
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