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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

AutorOsuna, Francisco J. ; Chain, P.; Cota, Agustín; Pavón, Esperanza ; Alba, María D.
Palabras claveBentonite
Engineered barrier
Rare-earth
Hydrothermal treatment
Subcritical conditions
Radioactive waste
Fecha de publicación2015
EditorElsevier
CitaciónApplied Clay Science, 118: 48-55 (2015)
ResumenEngineered 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.
Versión del editorhttp://dx.doi.org/10.1016/j.clay.2015.08.036
URIhttp://hdl.handle.net/10261/122448
DOI10.1016/j.clay.2015.08.036
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