A. Sasahira, F. Kawamura
May 25, 1988
Citations
1
Influential Citations
14
Citations
Journal
Journal of Nuclear Science and Technology
Abstract
The formation rate of ruthenium tetroxide (RuO4) from nitrosyl ruthenium trinitrate (RuNO(NO3)3) was measured at temperatures of 70–115°C in 3–9 mol·dm−3 nitric acid solutions. The gas-liquid equilibrium ratio was measured at temperatures of 40–80°C in 0.1–9 mol·dm−3 nitric acid solutions. The gas-liquid equilibrium ratio of RuO4 ranged about 60–260 under the experimental conditions. The reaction rate increased greatly with acid concentrations above 6 mol·dm−3. The activation energy of the reaction was about 130 kJ·mol−1 in 9 mol·dm−3 nitric acid solution. It was concluded that the rate of RuO4 formation dominated the distill-out phenomena of Ru in an evaporator as used in nuclear fuel reprocessing plants.