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Dissolution of Synthetic Brannerite at 90°C

  • Y. Zhang (a1), K.P. Hart (a1), B.S. Thomas (a1), Z. Aly (a1), H. Li (a1) and M. Carter (a1)...

Abstract

Brannerite, as a minor phase, exists in the pyrochlore-rich titanate ceramic formulations designed for immobilization of surplus weapons Pu. The dissolution of synthetic brannerite was studied at 90°C using static tests in pH 4 solution, deionized water and Finnsjön synthetic groundwater.

After 140 days the normalized U release rates into a pH 4 solution and deionized water reach similar values, ~10−2 g m−2 d−1, and are about 2 orders of magnitude higher than those in Finnsjön synthetic groundwater. The normalized Ti release rate into Finnsjön synthetic groundwater is about an order of magnitude higher than those in pH 4 solution and deionized water. The dissolution of brannerite is incongruent in the pH 4 solution and deionized water (preferential release of U over Ti), and nearly congruent in Finnsjön synthetic groundwater. SEM observations of the samples after 140 days in pH 4 solution and deionized water revealed minor surface alteration, in the form of a thin surface layer, probably TiO2, as a result of preferential releases of U in both cases.

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References

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1. Jostsons, A., Vance, E.R., Ebbinghaus, B., Immobilization of Surplus Plutonium in Titanate Ceramics, Paper presented at Global 99, Jackson Hole, Wyoming, USA, 1999, Aug. 29 to Sep. 3.
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Dissolution of Synthetic Brannerite at 90°C

  • Y. Zhang (a1), K.P. Hart (a1), B.S. Thomas (a1), Z. Aly (a1), H. Li (a1) and M. Carter (a1)...

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