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Alteration and dissolution of Na-montmorillonite in simulated groundwaters

Published online by Cambridge University Press:  27 March 2012

E. Myllykylä ,
M. Tanhua-Tyrkkö  and
A. Bouchet
E. Myllykylä
Affiliation:
VTT Technical Research Centre of Finland, P.O.Box 1000, 02044 Espoo, FINLAND
M. Tanhua-Tyrkkö
Affiliation:
VTT Technical Research Centre of Finland, P.O.Box 1000, 02044 Espoo, FINLAND
A. Bouchet
Affiliation:
Etudes Recherches Matériaux ERM, Centre Régional d’Innovation du Biopôle, 4 rue Carol Heitz, 86000 Poitiers, FRANCE
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Abstract

This study aims at gaining a better understanding of the behaviour of montmorillonite in contact with different ground waters; alteration of montmorillonite and possible formation of secondary minerals. Batch experiments were conducted with purified Swy-2 montmorillonite in simulated fresh (I=0.05 M, pH 8) and saline (I=0.1 M, pH 11) waters at 25 and 60ºC in anaerobic (Ar(g)) conditions. The concentrations of Al, Fe; Mg and Si were analysed from ultra-filtered solution samples with HR-ICP-MS (High Resolution Inductively Coupled Plasma Mass Spectrometry). The amount of released Si depended strongly on the experimental conditions. The Si concentrations at 60oC in the saline and fresh waters showed a difference greater than an order of magnitude. The initial purified montmorillonite and the solid materials from experiments were analysed with XRD. The analysis indicated that the nature of smectite did not change, but the experimental conditions, more or less, modified the structure of montmorillonite, e.g., in fresh waters the XRD spectra showed peaks typical of mixed layer minerals, which can refer to the presence of either randomly ordered illite/smectite or randomly ordered collapsed smectite/ hydrated smectite layers. The dissolution of montmorillonite was studied also by modelling with TOUGHREACT. The experimental and modelled results were compared revealing a need to develop the model e.g. in respect of the evolution of pH.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-p34
Copyright
Copyright © Materials Research Society 2012

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References

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