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

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, CaCl 2) 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 Fe 2+-rich smectite (saponite-like) together with the formation of feldspars, quartz and zeolites.
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D. Guillaume, A. Neaman, M. Cathelineau, Régine Mosser-Ruck, C. Peiffert, et al.. Experimental study of the transformation of smectite at 80 and 300°C in the presence of Fe oxides. Clay Minerals, Mineralogical Society, 2004, 39 (1), pp.17-34. ⟨10.1180/0009855043910117⟩. ⟨hal-01876596⟩

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