SLUDGE BATCH 5 (SB5): SELECTION OF CANDIDATE FRITS AND CHARACTERIZATION OF PRELIMINARY GLASS SYSTEMS

Fox, K ; Tommy Edwards, T ; David Best, D ; Irene Reamer, I ; Phyllis Workman, P

Savannah River Site (S.C.)

关键词: Sludges;    Radioactive Waste Processing;    Waste Forms;    Free Energy;    36 Materials Science;   

DOI  :  10.2172/918142
RP-ID  :  WSRC-STI-2007-00418
RP-ID  :  DE-AC09-96SR18500
RP-ID  :  918142

美国|英语

来源: UNT Digital Library

【 摘 要 】

Six potential frits were identified as candidates for processing the February 2007 projected SB5 composition (i.e., no implementation of aluminum dissolution) from an array of frit formulations based upon composition-property model predictions. Test glasses were fabricated in the laboratory to verify the applicability of the product performance models to glasses produced with these frits. Characterization of the glasses fabricated with the selected frits showed that all of the glasses had durability responses that are considered very acceptable at a waste loading of 36%. The durability responses were predictable by the free energy of hydration models. No crystallization was identified in the quenched glasses. Samples of the glasses that were slowly cooled following the canister centerline cooled (ccc) thermal profile were found to contain small amounts of magnetite. This crystalline phase had little impact on the durability of the glasses, and therefore is not an issue for concern based on the February 2007 projections. Note that revised versions of the SB5 flowsheet, including those incorporating aluminum dissolution, are expected, which will require additional frit development work when received. Initial melt rate testing results showed that the previously identified trend of increasing melt rate with increasing concentration of B2O3 for SB4 may be extended to this SB5 system. A complete report on melt rate testing with these frits will be issued at a later date.