Transfer Rate of Ruthenium from Calcination Layer to Glass Melt

To clarify the transfer rate of FP elements from the calcination layer to the glass melt, we have studied the transfer rate of ruthenium. A 1.0 g of sodium ruthenate or ruthenium dioxide was placed on the surface of a 20 g of borosilicate glass whose sodium content was 4, 10 or 20 wt%, and heated at 1473 K. The transfer rates of ruthenium were evaluated at 4-16 μmol h-1, and the rates were well correlated with the sodium content in the glass. Ruthenium dioxide was found to be more difficult than sodium ruthenate to dissolve into the borosilicate glass.