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HLW-Glass Dissolution and Co-Precipitation Studies

Published online by Cambridge University Press:  21 March 2011

Berthold Luckscheiter  and
Maria Nesovic
Berthold Luckscheiter
Affiliation:
Forschungszentrum Karlsruhe GmbH, Institut fuer Nukleare Entsorgung (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
Maria Nesovic
Affiliation:
Forschungszentrum Karlsruhe GmbH, Institut fuer Nukleare Entsorgung (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
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Abstract

To determine the maximum attainable solution concentrations of U, Th and fission products during long-term glass corrosion, co-precipitation studies were performed. The HLW-glass GPWAK 1 was dissolved in highly acid and basic media (100 g glass/L) at 80°C and by preparing acid solutions containing the various elements in soluble form. After dissolution the pH of the solution was slowly lowered/increased and the high concentrated solutions become super-saturated and strong precipitation takes place. The found pH-dependent concentrations of the various elements reflect their different solubility, lowest concentration for Th, Zr and Fe and highest for B, alkalis and alkaline earths. To find out the solid phases controlling the solution concentration, the run of the concentrations of some elements is compared with the solubility data of their pure solid phases (e.g. hydroxides) from literature. It was found that the concentrations of Nd, Th and U in dependence on pH agree quite well with solubility data of AmOHCO3, ThO2/Th(OH)4 and Schoepite UO2·(OH)2) ·H2O. Therefore, it can be assumed that the maximum attainable concentrations of many elements are controlled by such pure solid phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 87.1
Copyright
Copyright © Materials Research Society 2006

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References

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