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Mineralogical Evolution of a Claystone After Reaction With Iron Under Thermal Gradient

Published online by Cambridge University Press:  01 January 2024

Marie-Camille Jodin-Caumon ,
Régine Mosser-Ruck ,
Aurélien Randi ,
Olivier Pierron ,
Michel Cathelineau  and
Nicolas Michau
Marie-Camille Jodin-Caumon*
Affiliation:
G2R, Université de Lorraine, CNRS, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
Régine Mosser-Ruck
Affiliation:
G2R, Université de Lorraine, CNRS, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
Aurélien Randi
Affiliation:
G2R, Université de Lorraine, CNRS, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
Olivier Pierron
Affiliation:
G2R, Université de Lorraine, CNRS, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
Michel Cathelineau
Affiliation:
G2R, Université de Lorraine, CNRS, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
Nicolas Michau
Affiliation:
Agence nationale pour la gestion des déchets radioactifs (ANDRA), Direction Recherche et Développement/Service Colis et Matériaux, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay-Malabry Cedex, France
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The design of the repository for high-level nuclear waste (HLW) in France consists of a multiple-barrier system including steel canisters in a clay host rock. The system will undergo temperature variations in time and space, the heat source being the HLW within the canisters. The effect of a thermal gradient in space on the Fe-claystone interaction was investigated here by applying a thermal gradient (150–300°C and 80–150°C) to a mix of claystone, Fe, and an aqueous chloride solution over periods of 3 and 6 months. Following the reaction, the starting clay minerals (mostly illite and mixed-layer illite-smectite) evolved toward chlorite, Fe-serpentine, Fe-saponite, mixed-layer chlorite-smectite, or mixed-layer serpentine-smectite as a function of temperature. Iron corrosion made the medium basic and reductive. Magnesium enrichment of clay minerals was observed in the hottest part of the experiment due to Mg migration under the thermal gradient. Reaction progress was enhanced at the lowest temperatures, compared to batch experiments.

Keywords

Crystal ChemistryIronMixed-layer Illite-smectiteNuclear-waste ManagementTEM-EDSThermal Gradient
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 5 , October 2012 , pp. 443 - 455
Copyright
Copyright © Clay Minerals Society 2012

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