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Hydrotalcite Formed by Alteration of R7T7 Nuclear Waste Glass and Basaltic Glass in Salt Brine at 190°C

Published online by Cambridge University Press:  25 February 2011

A. Abdelouas ,
J. L. Crovisier ,
W. Lutze ,
R. Müller  and
W. Bernotat
A. Abdelouas
Affiliation:
Centre de Géochimie de la Surface, C.N.R.S., 1, rue Blessig, 67084 Strasbourg Cedex.
J. L. Crovisier
Affiliation:
Centre de Géochimie de la Surface, C.N.R.S., 1, rue Blessig, 67084 Strasbourg Cedex.
W. Lutze
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland.
R. Müller
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland.
W. Bernotat
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland.
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Abstract

The R7T7 and synthetic basaltic glasses were submitted to corrosion in a saline MgCl2 dominated solution at 190°C. For both glasses, the early alteration product is a hydrotalcite-like compound in which HPO42-, SO4-2 and Cl- substitutes to CO32. The measured d003 spacing is 7.68 Å for the hydrotalcite formed from R7T7 glass and 7.62 Å for the hydrotalcite formed from basaltic glass which reflect the high aluminium content. Chemical microanalyses show that the hydrotalcite is subsequently covered by a silica-rich gel which evolves into saponite after few months.

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References

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