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Valdivieso, F., Pijolat, M., Soustelle, M. and Jourde, J. (2000) Reduction of Uranium Oxide U3O8 into Uranium Dioxide UO2 by Ammonia. In: Solymosi, F. and Rask, O., Eds., 14th International Symposium on the Reactivity of Solids, August 2000, Budapest, Elsevier, 117-122, 141-142.

has been cited by the following article:

• TITLE: Reduction Kinetics of Uranium Trioxide to Uranium Dioxide Using Hydrogen

  AUTHORS: Pedro Orrego Alfaro, José Hernández Torres, Fernando Puchi Thiele

  KEYWORDS: Conversion, Uranium Oxides, Nuclear Fuel Cycle

  JOURNAL NAME: World Journal of Nuclear Science and Technology, Vol.5 No.3, July 9, 2015

  ABSTRACT: This article presents a study on the kinetics of the uranium conversion process, consisting in the reduction of uranium trioxide to uranium dioxide using hydrogen gas at temperatures of 500°C, 600°C and 700°C. Hydrogen concentrations used in the flow were 0.25 M, 0.50 M and 0.75 M. The mechanism established for the study of the kinetics of reduction of uranium trioxide was through the formation of an intermediate compound, U3O8. For this reason, these tests were divided into 2 stages: the first one the reduction from UO3 to U3O8, and second one from U3O8 to UO2. The results of each test were quantified by the release of H2O(g) produced by both reactions. Tests showed that the ideal working conditions are for hydrogen concentration flows of 0.75 M and temperatures in the range of 500°C - 600°C, with the intent to decrease the occurrence of side reactions that interfere with the process.