SULFATE RETENTION IN HIGH LEVEL WASTE SLUDGE BATCH 4 GLASSES [electronic resource] : A PRELIMINARY ASSESSMENT

Published:: Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: United States. Department of Energy. Savannah River Site, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Early projections of the Sludge Batch 4 (SB4) composition predicted relatively high concentrations of alumina (Al₂O₃, 23.5 wt%) and sulfate (SO₄²⁻, 1.2 wt%) in the sludge. A high concentration of Al₂O₃ in the sludge, combined with Na₂O additions in the frit, raises the potential for nepheline crystallization in the glass. However, strategic frit development efforts at the Savannah River National Laboratory (SRNL) have shown that frits containing a relatively high concentration of B₂O₃ can both suppress nepheline crystallization and improve melt rates. A high sulfate concentration is a concern to the DWPF as it can lead to the formation of sulfate inclusions in the glass and/or the formation of a molten, sulfate-rich phase atop the melt pool. To avoid these issues, a sulfate concentration limit of 0.4 wt% SO₄²⁻ in glass was originally set in the Product Composition Control System (PCCS) used at DWPF. It was later shown that this limit could be increased to 0.6 wt% SO₄²⁻ in glass for the Frit 418, Sludge Batch 3 (SB3) system.

Report Numbers:

E 1.99:wsrc-sti-2006-00038
wsrc-sti-2006-00038

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Note:

Published through SciTech Connect.
12/11/2006.
"wsrc-sti-2006-00038"
Tommy Edwards, T; Fox, K; David Peeler, D.

Funding Information:

DE-AC09-96SR18500

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