Dissolution of Synroc in deionised water at 150°C

Synroc containing 20 wt% simulated high level waste (HLW) was subjected to two sets of leach tests at 150°C where the leachant was and was not replaced during the test (replacement and non-replacement testing). The leachant was a KH-phthalate buffered solution (pH 4.2). Samples were characterised before and after leach testing using SEM, AEM and SIMS. Elemental concentrations in leachates were measured using ICP-MS. In concert with the findings of i) a dissolution study of perovskite in a flowing leachant and ii) a previous Synroc dissolution study (wherein Synroc containing 10 wt% simulated HLW was subjected to periodic replacement, leach testing in deionised water at 150°C), the results of this study show that when the leachant replacement frequency is varied from 7 d to the duration of the test, there is no effect on leach rate or leaching mechanisms. © Materials Research Society 1997

Description

Print version published by the Materials Research Society. MRS Online Proceedings was formerly published by Cambridge University Press and is currently published by Springer Nature. Print version is held at ANSTO Library at Dewey number 621.4838/31.

Keywords

Synthetic rocks, Ceramics, Dissolution, Leaching, Perovskite, Scanning electron microscopy, Mass spectroscopy, Titanium compounds, Water

Citation

Smith, K. L., Colella, M., Thorogood, G. J., Blackford, M. G., Lumpkin, G. R., Hart, K. P., Prince, K. E., Loi, E., & Jostsons, A. (1996). Dissolution of Synroc in deionised water at 150 C. Paper presented at Scientific Basis for Nuclear Waste Management XX, Boston, Massachusetts, USA, 2nd to 6th December 1996. In Gray, W. J. & Triay, I. R. (eds), Scientific Basis for Nuclear Waste Management XX, Boston, Massachusetts, USA, 2nd to 6th December 1996, (Vol. 465, pp. 349-354). doi:10.1557/PROC-465-349