Abstract

The dissolution of uranium dioxide in solutions containing sodium carbonate, sodium bicarbonate and potassium cyanide has been studied at temperatures in the range 30–80°C. The kinetics of the dissolution of uranium dioxide have been interpreted according to the fraction reacted, α. It is assumed that the uranium dioxide particles are spherical in shape. The results of the study indicate that the reaction boundary of the uranium dioxide particles is moving at constant velocity and that the products of the reaction are not limiting the reaction in the range a=0 to α = 0.8. Arrhenius plots gave an activation energy, for the whole process of uranium dioxide dissolution, of 51.1 kJ mol −1.

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