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Phase Formation in the Vitrification of Savannah River Site SB4 HLW Sludge Surrogate Using Frit and Glass Forming Chemicals

Published online by Cambridge University Press:  15 February 2011

O.I. Stefanovsky ,
S.V. Stefanovsky ,
A.A. Akatov  and
J.C. Marra
O.I. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121RUSSIA
S.V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121RUSSIA
A.A. Akatov
Affiliation:
Institute of Technology, Moskovskii av. 26, St-Petersburg 198013RUSSIA
J.C. Marra
Affiliation:
Savannah River National Laboratory, Building 773-42A, Savannah River Site, Aiken, SC 29808USA
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Abstract

Phase formation mechanisms associated with the vitrification of Savannah River Site (SRS) Sludge Batch 4 (SB4) high level waste surrogate with high iron and aluminum contents were studied by infrared spectroscopy (IRS), X-ray diffraction (XRD) and optical microscopy. Two mixtures at 50 wt.% SB4 waste loading were prepared as slurries with a water content of ∼50 wt% using a waste surrogate and commercially available Frit 503-R4 (Li2O – 8 wt%, B2O3 – 16 wt%, SiO2 – 76 wt%) or mixture of chemicals (LiOH·H2O, H3BO3, SiO2). The mixtures were air-dried at a temperature of 115 °C and heat-treated at 500, 700, 900, 1000, 1100, 1200, and 1300 °C for 1 hr at each temperature. IR spectra and XRD patterns of the products heat-treated at each temperature were recorded. In both the mixtures phase formation reactions started at low temperatures and yielded intermediate phases (sodalite, pyroxene-type, nepheline), and the reactions were mostly completed within the temperature range between 1000 and 1100 °C. The glassy materials prepared at 1200 and 1300 °C were composed of vitreous phase and magnetite/trevorite type spinel.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 337
Copyright
Copyright © Materials Research Society 2009

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References

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