THE MODELLING OF PLASMA-CHEMICAL PROCESS OF URANIUM OXIDES PRODUCTION FROM URANYLNITRATE SOLUTIONS
D. N. Bykhovski
Properties and composition of uranium oxide powders produced by pulverising of uranyl-nitrate solutions into plasma flow depend to a large degree on the temperature of a
reaction mixture. For the preliminary evaluation of experimental conditions needed for the production of oxides with desired properties, mathematical model was created on the basis of equations of condensed phase movement related to reactor, evaporation water from the solution droplets, conservation of energy and the balance of mass. The model allows to appreciate the temperature changes of the gas medium, of the solution droplets and of the oxide particles along the length of the reactor. It was ascertained, for instance, that when using installation with the capacity 10 kW and the high-frequency inductive generation of plasma,
the change of the temperature of a reactional mixture on coming out of the reactor from 350 to 850°C can be reached by reduction of the solution feed from 1.3 to 0.5 l/hour. By the lower temperature it is expected the formation of ultra-dispersed oxide powders, by the higher one powders with moderate specific area.