[1B01-03] Waste treatment and solidification

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[1B03] Fabrication of U-Bearing Synroc by Spark Plasma Sintering and Evaluation of Its Phase Assemblage

*Ryota Nakazawa¹, Jessey De Roeck², Masahiko Nakase¹ (1. Iinstitute of Science Tokyo, 2. Delft University of Technology)

Keywords:

Synroc,Spark plasma sintering,Uranium,phase assemblage

U-bearing Synroc was fabricated by spark plasma sintering (SPS), and its phase assemblage and U solubility were evaluated using SEM-EDS and XRD. The fabricated Synroc consisted mainly of pyrochlore, perovskite, and UO2, and U was preferentially incorporated into pyrochlore rather than perovskite. Furthermore, the U concentrations in each phase were comparable to those reported for conventionally furnace-sintered samples, indicating that SPS can produce Synroc with U solubility comparable to that achieved by conventional furnace sintering.