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Development and Characterization of Glassy Materials for HLW Immobilization with Datolite and Bentonite as Glass Forming Additives

Published online by Cambridge University Press:  19 December 2016

Sergey V. Stefanovsky ,
Michael V. Skvortsov ,
Olga I. Stefanovsky ,
Boris S. Nikonov ,
Stepan Kalmykov ,
Igor A. Presniakov  and
Iana S. Glazkova
Sergey V. Stefanovsky*
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry (IPCE), Russian Academy of Sciences, Federal Agency of Science Organizations, 31-4 Leninskii av, Moscow 119071 Russia
Michael V. Skvortsov
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, 125047 Moscow, Russia
Olga I. Stefanovsky
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry (IPCE), Russian Academy of Sciences, Federal Agency of Science Organizations, 31-4 Leninskii av, Moscow 119071 Russia
Boris S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits, Mineralogy, Petrography, and Geochemistry, Russian Academy of Sciences, Federal Agency of Science Organizations, Staromonetnii lane 35, Moscow 11017 Russia
Stepan Kalmykov
Affiliation:
Lomonosov Moscow State University, Radiochemistry division, Vorobyovy Gory, 1, Building 10, Moscow 119991 Russia
Igor A. Presniakov
Affiliation:
Lomonosov Moscow State University, Radiochemistry division, Vorobyovy Gory, 1, Building 10, Moscow 119991 Russia
Iana S. Glazkova
Affiliation:
Lomonosov Moscow State University, Radiochemistry division, Vorobyovy Gory, 1, Building 10, Moscow 119991 Russia
*
*(Email: serge.stefanovsky@yandex.ru)
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Abstract

Glassy materials for HLW immobilization were produced from HLW surrogate, quartz sand, datolite (CaBSiO4OH), and bentonite clay at a temperature of up to 1200 °C. Waste loading (WL) ranged between 20 and 40 wt.%. The glasses were characterized by X-ray diffraction, scanning electron microscopy and Fourier-Transform infrared spectroscopy. Glasses with waste loading of up to 35 wt.% obtained by melt pouring onto a metal plate were found to be rather homogeneous but contained minor noble metal oxides and britholite (at high waste loadings) while those annealed in turned-off furnace were partly devitrified. Average chemical composition of britholite corresponded to formula Na1.00Ca4.02Y0.33Ce0.05Nd3.64Gd0.17Si6.79O24.39. The glass network is built from SiO4 units with one or two bridging oxygens and complex borate groups with primarily ternary coordinated boron. Increase of waste loading resulted in shift of band’s maxima to lower wavenumbers exhibiting increasing the fraction of SiO4 unit with lower number of bridging oxygen ions and thus reduction of glass network connectedness. Glasses with up to 30 wt.% waste loading kept their high hydrolytic durability making them suitable for HLW immobilization.

Keywords

infrared (IR) spectroscopywaste managementx-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 2 , Issue 10: Scientific Basis for Nuclear Waste Management XL , 2017 , pp. 569 - 575
Copyright
Copyright © Materials Research Society 2016 

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