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Effects of Halides and Sulphates in Synroc-C

Published online by Cambridge University Press:  10 February 2011

E. R. Vance  and
J. S. Hartman
E. R. Vance
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Menai, NSW 2234, Australia
J. S. Hartman
Affiliation:
Chemistry Dept., Brock University, St. Catharines, Ontario, L2S 3A I, Canada
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Abstract

Halides can be retained in bellows hot-pressed Synroc-C. Loadings of 0.2 wt% of fluoride or 2 wt% of sulphate did not appear to exert deleterious effects on the aqueous durability of the Synroc, but 0.2 wt% of chloride or 0.5 wt% of fluoride increased the Cs leach rate by a factor of ˜10. Fluoride was present principally as CaF2 in both calcined and hot-pressed Synrocs containing (a) ˜2 wt% of F as the only waste or (b) ˜2 wt% of F plus 20 wt% of simulated PW-4b Purex reprocessing waste. The speciation of Cl- in Synroc is not clear, though there was some evidence of CsCl from nmr and a compound giving a similar X-ray pattern to that of TiCI3. Iodine can retained in the hot-pressed Synroc containing the full complement of fission products, probably as insoluble Ag, Cr or Pd group iodides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 41
Copyright
Copyright © Materials Research Society 1999

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References

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