Clays and Clay Minerals, Vol. 60, No. 5, 443–455, 2012.
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Authors
Jodin-caumon, Marie-camille
Mosser-ruck, Regine
Randi, Aurelien
Pierron, Olivier
Cathelineau, Michel
Michau, Nicolas
Issue Date
2012
Type
Article
Language
Keywords
Periodicals , Geology , Crystal Chemistry , Iron , Mixed-layer Illite-smectite , Nuclear-waste Management , TEM-EDS , Thermal Gradient
Alternative Title
Mineralogical Evolution Of A Claystone After Reaction With Iron Under Thermal Gradient
Abstract
The design of the repository for high-level nuclear waste (HLW) in France consists of a multiple-barrier system including steel canisters in a clay host rock. The system will undergo temperature variations in time and space, the heat source being the HLW within the canisters. The effect of a thermal gradient in space on the Fe–claystone interaction was investigated here by applying a thermal gradient (150-300ºC and 80-150ºC) to a mix of claystone, Fe, and an aqueous chloride solution over periods of 3 and 6 months. Following the reaction, the starting clay minerals (mostly illite and mixed-layer illitesmectite) evolved toward chlorite, Fe-serpentine, Fe-saponite, mixed-layer chlorite-smectite, or mixedlayer serpentine-smectite as a function of temperature. Iron corrosion made the medium basic and reductive. Magnesium enrichment of clay minerals was observed in the hottest part of the experiment due to Mg migration under the thermal gradient. Reaction progress was enhanced at the lowest temperatures, compared to batch experiments.
Description
gsccm60501-jod.pdf -- 2,069KB
Citation
Clays and Clay Minerals, Vol. 60, No. 5, 443–455, 2012.
Publisher
The Clay Minerals Society
License
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