Interaction of titanium with smectite within the scope of a spent fuel repository: A spectroscopic approach
| Autor: | Jocelyne Brendle, Daniel Grolimund, Margit Snellman, Leena Kiviranta, Joffrey Huve, Paul Wersin |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_element
Mineralogy 020101 civil engineering 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Copper Hydrothermal circulation 0201 civil engineering chemistry.chemical_compound Montmorillonite chemistry Chemical engineering Geochemistry and Petrology 550 Earth sciences & geology Bentonite Zeolite Clay minerals Wet chemistry Geology 0105 earth and related environmental sciences Titanium |
| Zdroj: | Grolimund, D.; Wersin, Paul; Brendlé, J.; Huve, J.; Kiviranta, L.; Snellman, M. (2016). Interaction of titanium with smectite within the scope of a spent fuel repository: a spectroscopic approach. Clay minerals, 51(2), pp. 249-266. Mineralogical Society 10.1180/claymin.2016.051.2.11 |
| ISSN: | 1471-8030 0009-8558 |
| DOI: | 10.1180/claymin.2016.051.2.11 |
| Popis: | The Swedish and Finnish nuclear waste repository design, KBS-3H, foresees horizontal emplacement of copper canisters-bentonite modules surrounded by a titanium shell. The interaction of titanium with bentonite was studied here using a combination of wet chemistry and a spectroscopic approach to evaluate the potential impact of Ti corrosion on the clay. For natural analogue clays with high Ti contents, spectroscopic investigations showed that titanium occurs as crystalline TiO2. In contrast, the Ti in the MX-80 bentonite occurs in the clay structure, presumably in the octahedral sheet. Hydrothermal tests conducted at 200°C using synthetic montmorillonite showed little if any change in the montmorillonite structure at near-neutral and acidic conditions. Under alkaline conditions, limited alteration was observed, including the formation of trioctahedral clay minerals and zeolite. These changes, however, occurred independently of the addition of Ti. In the batch tests conducted at 80°C, Ti did not occur as separate TiO2particles. The comparison of experimental data with spectroscopic simulations provides sound evidence that Ti was incorporated in a neoformed phyllosilicate structure. |
| Databáze: | OpenAIRE |
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