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Kinetics of chlorination of uranium–antimony composite oxide for uranium removal from waste catalyst used for acrylonitrile synthesis

ABSTRACT For uranium removal from waste catalyst used for acrylonitrile synthesis, kinetics of chlorination of uranium–antimony composite oxide was studied. During the chlorination treatment with hydrogen chloride gas at a partial pressure of 0.6–6.7 kPa and 873–1173 K, the uranium–antimony composite oxide, USb3O10, which was contained in the waste catalyst converted to another composite oxide, USbO5, then changed to uranium oxide. Both reaction rates of the conversions, from USb3O10 to USbO5 and from USbO5 to U3O8, were described by a first order function of the fraction of USb3O10 and USbO5, and their activation energies under the condition at 1.0 kPa hydrogen chloride gas were almost same values at (8.0 ± 0.4) × 104 J mol−1.