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Experimental study of the transformation of smectite at 80 and 300ºC in the presence of Fe oxides

Published online by Cambridge University Press:  09 July 2018

D. Guillaume ,
A. Neaman ,
M. Cathelineau ,
R. Mosser-Ruck ,
C. Peiffert ,
M. Abdelmoula ,
J . Dubessy ,
F. Villiéras  and
N. Michau
D. Guillaume*
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506, Vandœuvre-lès-Nancy
A. Neaman
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), UMR 7569 CNRS-INPL, Ecole Nationale Supérieure de Géologie, BP 40, 54501, Vandœuvre-lès-Nancy
M. Cathelineau
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506, Vandœuvre-lès-Nancy
R. Mosser-Ruck
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506, Vandœuvre-lès-Nancy
C. Peiffert
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506, Vandœuvre-lès-Nancy
M. Abdelmoula
Affiliation:
Laboratoire de Chimie Physique et Microbiologie pour l’Environnement (LCPME), UMR 7564 CNRS-UHP, Université Henri Poincaré, 405 rue de Vandœuvre, 54600, Villers-lès-Nancy
J . Dubessy
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506, Vandœuvre-lès-Nancy
F. Villiéras
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), UMR 7569 CNRS-INPL, Ecole Nationale Supérieure de Géologie, BP 40, 54501, Vandœuvre-lès-Nancy
N. Michau
Affiliation:
Agence nationale pour la gestion des déchets radioactifs (ANDRA), Direction Scientifique/Service Matériaux, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay-Malabry, France
*
E-mail: [email protected]
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Abstract

The alteration and transformation behaviour of montmorillonite (Wyoming bentonite) was studied experimentally to simulate the mineralogical and chemical reaction of clays in contact with steel in a nuclear waste repository. Batch experiments were conducted at 80 and 300ºC, in low-salinity solutions (NaCl, CaCl2) and in the presence or otherwise of magnetite and hematite, over a period of 9 months. The mineralogical and chemical evolution of the clays was studied by XRD, SEM, transmission Mössbauer spectroscopy and EDS-TEM. Experimental solutions were characterized by ICP-AES and ICP-MS. The main results are that no significant change in the crystal chemistry of the montmorillonite occurred at 80ºC, while at 300ºC, the presence of Fe oxides leads to a partial replacement of montmorillonite by high-charge trioctahedral Fe2+-rich smectite (saponite-like) together with the formation of feldspars, quartz and zeolites.

Keywords

bentonitesmectitesaponitemagnetitehematiteexperimental synthesisEDS-TEMtransmission Mössbauer spectroscopyX-ray diffraction
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 1 , March 2004 , pp. 17 - 34
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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