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

  • D. Guillaume (a1), A. Neaman (a2), M. Cathelineau (a1), R. Mosser-Ruck (a1), C. Peiffert (a1), M. Abdelmoula (a3), J . Dubessy (a1), F. Villiéras (a2), A. Baronnet (a4) and N. Michau (a5)...

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).

Copyright

Corresponding author

*E-mail: damien.guillaume@gr2.uhp-nancy.fr
present address: Westfälische Wilhelms-Universität Münster, Institut für Mineralogie, Corrensstr. 24, 48149 Münster, Germany

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Keywords

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

  • D. Guillaume (a1), A. Neaman (a2), M. Cathelineau (a1), R. Mosser-Ruck (a1), C. Peiffert (a1), M. Abdelmoula (a3), J . Dubessy (a1), F. Villiéras (a2), A. Baronnet (a4) and N. Michau (a5)...

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