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

  • O.I. Stefanovsky (a1), S.V. Stefanovsky (a1), A.A. Akatov (a2) and J.C. Marra (a3)

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.

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1 Gerdes, K.D., Marra, J.C., Peeler, D.K., Harbour, J.R., Fox, K.M., Vienna, J.D., Aloy, A.S., Stefanovsky, S.V. and Bondarkov, M.D., in Proc. Int. Conf. Waste Management '08 (Phoenix, AZ, February 24-28, 2008. ID 8192, 2008). CD-ROM.
2 Herman, C.C., Summary of Results for Expanded Macrobatch 3 Variability Study, WSRCTR-2001-00511 (Savannah River National Laboratory, 2001).
3 Stefanovsky, O.I., Stefanovsky, S.V., Akatov, A.A., Marra, J.C., in Proc. Int. Conf. Waste Management 2009 (Phoenix, AZ, Match 1-5, 2009. ID 9300, 2009) CD-ROM.
4 Marra, J.C., Sludge and Glass Compositions for Cold Crucible Induction Melter (CCIM) Testing – Sludge Batch 4, SRT-MST-2007-00070 (Savannah River National Laboratory, 2007).
5 Nakamoto, K., Infrared Specra of Inorganic and Coordination Compounds (John Wiley & Sons, New York, London, 1962).
6 Plusnina, I.I., Infrared Spectra of Minerals (MGU, Moscow, 1977).
7 Kolesova, V.A., Glass Physics and Chemistry (Russ.) 12 [1] 4 (1986).
8 Stefanovsky, S.V., Marra, J.C., in Proc. Int. Conf. Waste Management '07 (Tucson, AZ, ID 7132, 2007). CD-ROM.

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

  • O.I. Stefanovsky (a1), S.V. Stefanovsky (a1), A.A. Akatov (a2) and J.C. Marra (a3)

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