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Hydrothermal Leaching of R7-T7 Borosilicate Glass

Published online by Cambridge University Press:  21 February 2011

J. Caurel ,
E. Vemaz  and
D. Beaufort
J. Caurel
Affiliation:
SDHA/SEMC, CEN-Valrhô, BP171, 30205 Bagnols-sur-Cèze Cedex, France
E. Vemaz
Affiliation:
SDHA/SEMC, CEN-Valrhô, BP171, 30205 Bagnols-sur-Cèze Cedex, France
D. Beaufort
Affiliation:
Laboratoire de Pétrologie des Altérations Hydrothermales, Université de Poitiers, 40 avenue du recteur Pineau, 86022 Poitiers Cedex, France
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Abstract

The results of hydrothermal leach tests are intended to be used to predict long-term low-temperature glass dissolution. It is often assumed that data can be extrapolated to other conditions using an Arrhenius-type equation. Hydrothermal leaching mechanisms and their temperature dependence in R7T7 glass were investigated in static experiments lasting from 7 days to 1 year at 150°C and 250°C. Leachates, surface layers and crystalline products were analyzed by ICP, TEM, SEM, EMP, XRD and cathodoluminescence. Unexpectedly, no actual saturation conditions in solutions were reached after one year leaching at 150°C nor at 250°C. The effect of precipitation of alteration products (a silica-enriched amorphous layer and aluminosilicates [smectite at 150°C, smectite and zeolites at 250°C]) is discussed. However, the formation of large cracks in the bulk glass results in a higher glass reacting surface and a higher dissolution rate at 250°C. Arrhenius calculations cannot be used to extrapolate our hydrothermal data to lower-temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 309
Copyright
Copyright © Materials Research Society 1990

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References

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