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Borosilicate HLW Glass Leaching in Silica Saturated Solution

Published online by Cambridge University Press:  28 February 2011

F. Lanza ,
A. Manara ,
L. Mammarella ,
P. Blasi  and
G. Ceccone
F. Lanza
Affiliation:
Commission of the European Communities, Joint Research Centre, ISPRA Establishment, 21020 ISPRA (VA), Italy
A. Manara
Affiliation:
Commission of the European Communities, Joint Research Centre, ISPRA Establishment, 21020 ISPRA (VA), Italy
L. Mammarella
Affiliation:
Commission of the European Communities, Joint Research Centre, ISPRA Establishment, 21020 ISPRA (VA), Italy
P. Blasi
Affiliation:
Florence University
G. Ceccone
Affiliation:
Pavia University
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Abstract

The aim of these measurements is to study how a silica saturated solution influences leaching from a HLW glass matrix. Cylindrical samples of I117 borosilicate glasses were suspended in polycarbonate vials containing a SiO2 saturated solution and leached at temperature of 50 or 80°C for different times (from 1/2 to 28 days). Mass loss, X-ray photoelectron spectroscopy (XPS) and nuclear reaction techniques were applied for post leaching tests on the glass samples.

Analysis of boron and sodium released from the glass were performed in the leachate. Sodium and boron release followed a square root time dependence at all the observed leaching times.

XPS measurements revealed a surface increase of silicon content with respect to unleached samples, with aluminium showing the same behaviour as silicon. The presence of the layer enriched in silicon and aluminium does not stop the release of sodium and boron, whereas the mass loss does slow down because of the formation of aluminio-silicate compounds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 112: Symposium P – Scientific Basis for Nuclear Waste Management XI , 1987 , 685
Copyright
Copyright © Materials Research Society 1988

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