Synroc derivatives for the Hanford waste remediation task
- Australian Nuclear Science and Technology Organisation, Menai, New South Wales (Australia)
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{sup 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{sup {minus}4} g/m{sup 2}/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 immobilizing 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.
- OSTI ID:
- 572078
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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