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Experimental synthesis of chlorite from smectite at 300ºC in the presence of metallic Fe

Published online by Cambridge University Press:  09 July 2018

D. Guillaume*
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques (G2R), UMR 7566 CNRS-CREGU-INPL-UHP, Université Henri Poincaré, BP 239, 54506 Vandoeuvre-lès-Nancy
A. Neaman
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), UMR 7569 CNRS-INPL, Ecole Nationale Supérieure de Géologie, BP 40, 54501 Vandoeuvre-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 Vandoeuvre-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 Vandoeuvre-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 Vandoeuvre-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 Vandoeuvre, 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 Vandoeuvre-lès-Nancy
F. Villiéras
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), UMR 7569 CNRS-INPL, Ecole Nationale Supérieure de Géologie, BP 40, 54501 Vandoeuvre-lès-Nancy
A. Baronnet
Affiliation:
Centre deRecherche sur lesMécanismes de Croissance CristallineCRMC2-CNRS, Campus Luminy, case 913, 13288, Marseille
N. Michau
Affiliation:
Agence nationalepour la gestion des déchets radioactifs(ANDRA), Direction Scientifique/ServiceMatériaux, Parc de la Croix Blanche, 1/7 rue Jean Monnet, 92298 Châtenay-Malabry, France
*

Abstract

The alteration and transformation behaviour of montmorillonite (bentonite from Wyoming, MX-80) in low-salinity solutions (NaCl, CaCl2) in the presence of metallic Fe (powder and 86461 mm plate) and magnetite powder was studied in batch experiments at 300ºC to simulate the mineralogical and chemical reactions of clays in contact with steel in a nuclear waste repository. The evolutions of pH and solution concentrations were measured over a period of 9 months. The mineralogical and chemical evolution of the clays was studied by XRD, SEM, Transmission Mössbauer Spectroscopy and TEM (EDS, HR imaging and EELS). Dissolution of the di-octahedral smectite of the starting bentonite was observed, in favour of newly formed clays (chlorite and saponite), quartz, feldspars and zeolite. The formation of Fe-chlorite was triggered by contact with the metallic Fe plate and Fe-Mg-chlorite at distance from the Fe plate (>2 mm).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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