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Alternative Synroc Formulations

  • E.R. Vance (a1), K.L. Smith (a1), G.J. Thorogood (a1), B.D. Begg (a1), S.S. Moricca (a1), P.J. Angel (a1), M.W.A. Stewart (a1), M.G. Blackford (a1) and C.J. Ball (a1)...

Abstract

Perovskite is the least durable of the resistate minerals comprising Synroc-C and it is desirable to reduce its abundance in Synroc. Kinetic limitations and competition with Csapparently affect the incorporation of Sr into hollandite during hot-pressing at 1200ºC/20 MPa so that ∼ 10% of perovskite (a value below the percolation limit) is probably an optimum target. Zirconolite-rich Synroc formulations have been prepared for actinide-rich wastes. Background XRD and TEM studies have also been performed to study the crystal-chemical behaviour of Nd (a simulant of trivalent actinides) in zirconolite. Either rare-earth compensated perovskite or freudenbergite in Synroc can evidently be used to immobilise Na-bearing HLW.

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[1] Ringwood, A.E., Kesson, S.E., Ware, N.G., Hibberson, W.D. and Major, A., Geochem. J., 12, 141 (1979).
[2] Ringwood, A.E., Kesson, S.E., Reeve, K.D., Levins, D.M. and Ramm, E.J., in Radioactiv Waste Forms for the Future, edited by Lutze, W. and Ewing, R.C. (Elsevier Science Publishers, New York, 1988) pp. 233334.
[3] Vance, E.R. and Agrawal, D.K., Nucl. Chem. Waste Manage. 3, 229 (1982).
[4] Vance, E.R., Moricca, S., Thorogood, G.J. and Lumpkin, G.R., Key Eng. Mater. 43–10, 717 (1990).
[5] Morgan, P.E.D., Clarke, D.R., Jantzen, C.M. and Harker, A.B., J. Amer. Ceram. Soc. 64, 249 (1981).
[6] Smart, J.S., J. Phys. Chem. Solids, 16, 169 (1960).
[7] Vance, E.R., Ball, C.J., Blackford, M.G., Cassidy, D.J. and Smith, K.L., J. Nucl. Mater. 17, 58 (1990).
[8] Kesson, S.E. and Ringwood, A.E., Nucl. Chem. Waste Storage 2, 53.
[9] Vance, E.R., Stewart, M.W.A. and Lumpkin, G.R., J. Mater. Sci. 26, 2694 (1991).
[10] Vance, E.R. and Thorogood, G.J., J. Amer. Ceram. Soc. 74, 854 (1991).
[11] Buykx, W.J., Hawkins, K., Levins, D.M., Mitamura, H., Smart, R. St.C., Stevens, G.T., Watson, K.G., Weedon, D. and White, T.J., J. Amer. Ceram. Soc. 1, 678 (1988).
[12] Morgan, P.E.D., Pugar, E.A. and Shaw, T.M., in Nuclear Waste Managgment, Advances in Ceramics, Volume 8, edited by Wicks, G.G. and Ross, W.A. (American Ceramic Society, Columbus, Ohio, U.S.A., 1984) pp. 209221.
[13] Luo, S., Jiang, Y. and Liu, D., Waste Manage., 10, 23 (1990).

Alternative Synroc Formulations

  • E.R. Vance (a1), K.L. Smith (a1), G.J. Thorogood (a1), B.D. Begg (a1), S.S. Moricca (a1), P.J. Angel (a1), M.W.A. Stewart (a1), M.G. Blackford (a1) and C.J. Ball (a1)...

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