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

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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 300°C, 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 80°C, while at 300°C, 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.
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Keywords: BENTONITE; EDS-TEM TRANSMISSION; EXPERIMENTAL SYNTHESIS; HEMATITE; MAGNETITE; MOSSBAUER SPECTROSCOPY; SAPONITE; SMECTITE; X-RAY DIFFRACTION

Document Type: Research Article

Publication date: 2004-03-01

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