Synroc derivatives for the Hanford waste remediation task
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Date
1997
Journal Title
Journal ISSN
Volume Title
Publisher
Materials Research Society
Abstract
Three wt% each of Cs and Tc were mixed with the standard Synroc precursor and the ceramic was formed by hot-pressing. Attempts were made to incorporate the Tc as either metal or Tc 4+, using different redox conditions in processing. Volatile losses of Tc during calcination were < 0.1% in all cases. Short-term Tc leach rates when the Tc was present as a metal alloy were in the order of 10−4 g/m /d at 90°C with frequently changed water, and decreased with increasing leaching time. The valence of the Tc was monitored by X-ray absorption spectroscopy at the drying and calcination stages of the production. The general viability of Synroc/glass composites for immobilising the Hanford HLW sludges is further demonstrated by using further refinements of additive schemes for the inactive “All-blend” formulation and initial studies using the U-containing “All-blend” waste formulation. © Materials Research Society 1997
Description
Physical copy held by ANSTO at DDC: 621.4838/31.
Abstract also available online at https://doi.org/10.1557/PROC-465-341
Keywords
Synroc process, Ceramics, Hot-dry-rock systems, Calcination, Redox process, Valence, Water, Absorption spectroscopy
Citation
Vance, E. R., Hart, K. P., Day, R. A., Carter, M. L., Hambley, M., Blackford, M. G., & Begg, B. D. (1996). Synroc derivatives for the Hanford waste remediation task. Paper presented to the Scientific Basis for Nuclear Waste Management XX, 2-6 December 1996, Boston, Massachachuetts, U. S. A. In Gray, W. J. & Triay, I. R. (Eds.), Material Research Society Symposium Proceedings, Symposium held 2-6 December, 1996, Boston, Massachusetts, U. S. A., Vol. 465, pp. 341-348.