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Alteration of Cold Crucible Melter Titanate-Based Ceramics: Comparison with Hot-Pressed Titanate-Based Ceramic

Published online by Cambridge University Press:  03 September 2012

T. Advocat ,
G. Leturcq ,
J. Lacombe ,
G. Berger ,
R. A. Day ,
K. Hart ,
E. Vernaz  and
A. Bonnetier
T. Advocat
Affiliation:
Commissariat à l'Energie Atomique (CEA) Centre d'Etudes de la Vallée du Rhône, DCC/DRDD, Service de Confinement des Déchets, BP 171, F-30207 Bagnols-sur-Cèze Cedex, France
G. Leturcq
Affiliation:
Commissariat à l'Energie Atomique (CEA) Centre d'Etudes de la Vallée du Rhône, DCC/DRDD, Service de Confinement des Déchets, BP 171, F-30207 Bagnols-sur-Cèze Cedex, France
J. Lacombe
Affiliation:
Commissariat à l'Energie Atomique (CEA) Centre d'Etudes de la Vallée du Rhône, DCC/DRDD, Service de Confinement des Déchets, BP 171, F-30207 Bagnols-sur-Cèze Cedex, France
G. Berger
Affiliation:
Université Paul Sabotier UMR5563, 38 rue des 36 Ponts, F-31400 Toulouse, Franc
R. A. Day
Affiliation:
Austalian Nuclear Science & Technology Organization (ANSTO), Private Mail Bag 1, Menai, NSW 2234, Australia
K. Hart
Affiliation:
Austalian Nuclear Science & Technology Organization (ANSTO), Private Mail Bag 1, Menai, NSW 2234, Australia
E. Vernaz
Affiliation:
Commissariat à l'Energie Atomique (CEA) Centre d'Etudes de la Vallée du Rhône, DCC/DRDD, Service de Confinement des Déchets, BP 171, F-30207 Bagnols-sur-Cèze Cedex, France
A. Bonnetier
Affiliation:
Commissariat à l'Energie Atomique (CEA) Centre d'Etudes de la Vallée du Rhône, DCC/DRDD, Service de Confinement des Déchets, BP 171, F-30207 Bagnols-sur-Cèze Cedex, France
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Abstract

Synroc ceramics were synthesized in an induction-heated cold crucible at laboratory scale (1 kg) from an oxide mixture, and at industrial prototype scale (45 kg) from Synroc previously produced by sintering under load at high temperature. After melting, both materials contained the major phases of Synroc-C. The chemical durability of both melted materials, as determined by static leaching of powder samples in initially pure water at 90°C with an SA/V ratio of 20000m−1, was equivalent to that of conventional hot-pressed Synroc-C. Cerium, used in this investigation to simulate the presence of tri-and tetravalent actinides, was found in steady-state concentrations on the order of 1 ppb (i.e. NL(Ce) ≤ 10−6 g·m−2). The concentration in the leachates was independent of the initial CeO2 content of the Synroc (at least up to 10 wt%); moreover, it is similar to the results obtained with hot-pressed Synroc-C specifically formulated for conditioning long-lived actinides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 355
Copyright
Copyright © Materials Research Society 1997

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References

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