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

D. Guillaume, ALEXANDER NEAMAN , M. Cathelineau, R. Mosser-Ruck, C. Peiffert, M. Abdelmoula, J. Dubessy, F. Villieras, A. Baronnet, N. Michau

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Abstract

The alteration and transformation behaviour of montmorillonite (bentonite from Wyoming, MX-80) in low-salinity solutions (NaCl, CaC12) in the presence of metallic Fe (powder and 8×4×1 mm plate) and magnetite powder was studied in batch experiments at 300°C 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).

Original languageEnglish
Pages (from-to)281-302
Number of pages22
JournalClay Minerals
Volume38
Issue number3
DOIs
StatePublished - 1 Sep 2003

Keywords

  • Bentonite
  • Chlorite
  • EDS-TEM
  • EELS-TEM
  • Exprimental synthesis
  • Fe
  • HRTEM imaging
  • Magnetite
  • Mössbauer spectroscopy
  • Saponite
  • Smectite

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