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Formation of Hydrotalcite-like Compounds During R7T7 Nuclear Waste Glass and Basaltic Glass Alteration

Published online by Cambridge University Press:  28 February 2024

A. Abdelouas ,
J. L. Crovisier ,
W. Lutze ,
B. Fritz ,
A. Mosser  and
R. Müller
A. Abdelouas
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland Centre de Géochimie de la Surface, C.N.R.S., 1, rue Blessig, 67084 Strasbourg Cedex, France
J. L. Crovisier
Affiliation:
Centre de Géochimie de la Surface, C.N.R.S., 1, rue Blessig, 67084 Strasbourg Cedex, France
W. Lutze*
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland
B. Fritz
Affiliation:
Centre de Géochimie de la Surface, C.N.R.S., 1, rue Blessig, 67084 Strasbourg Cedex, France
A. Mosser
Affiliation:
IPCMS Groupe Surfaces-Interfaces, 4, rue Blaise Pascal, 67070 Strasbourg Cedex, France
R. Müller
Affiliation:
Kernforschungszentrum Karlsruhe, INE, Postfach 3640, 76021 Karlsruhe, Deutschland
*
*Present address: University of New Mexico, 209 Farris Engineering Building, Albuquerque, New Mexico 87131.
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Abstract

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Alteration experiments have been performed using RTT7 and synthetic basaltic glasses in MgCl2−CaCl2 salt solution at 190°C. The duration of experiments ranged from 0.25 to 463 days. The alteration products were studied by Scanning Electron Microscope (SEM), Scanning Transmission Electron Microscope (STEM), X-ray diffraction (XRD) and Electron Spectrometry for Chemical Analysis (ESCA). For both glasses, the early alteration product is a hydrotalcite-like compound [Mg6Al2CO3(OH)16·4H2O] in which HPO42−, SO42− and Cl− substitutes for CO32−. The measured basal 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 Al/Al + Mg ratios x (0.34 ≤ x ≤ 0.46). The chemical microanalyses show that the hydrotalcite is subsequently covered by a silica-rich gel which evolves into saponite after a few months. These results support the use of basaltic glasses alteration patterns in Mg-rich solution, to understand the long-term behavior of R7T7 nuclear waste glass.

Keywords

Basaltic glassExperimental alterationHydrotalcite-like compoundsMgCl2-CaCl2 salt solutionR7T7 nuclear waste glassSaponite
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 5 , October 1994 , pp. 526 - 533
Copyright
Copyright © 1994, Clay Minerals Society

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