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UO2, NpO2 and PuO2 preparation in aqueous nitrate solutions in the presence of hydrazine hydrate |
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| Authors: | Y M Kulyako S A Perevalov T I Trofimov D A Malikov S E Vinokurov M D Samsonov B F Myasoedov A M Fedoseev A A Bessonov A Y Shadrin |
| Institution: | 1. Vernadsky Institute of Geochemistry and Analytical Chemistry of RAS, Moscow, Russia 2. Frumkin Institute of Physical Chemistry and Electrochemistry of RAS, Moscow, Russia 3. Bochvar Institute (VNIINM), Center on Radioactive Waste and Spent Nuclear Fuel Management and Decommissioning, Moscow, Russia |
| Abstract: | It was established that heating to 90 °C of nitrate solutions of U, Np and Pu in the presence of hydrazine hydrate results in the formation of hydrated dioxides of these elements. On ignition under inert or reducing conditions in the temperature range of 280–800 °C hydrated uranium dioxide transmogrify into crystalline UO2. On ignition in air atmosphere UO2·nH2O turns into UO3 at 440 °C and into U3O8 at 570–800 °C. It was shown that thermolysis of the solution containing a mixture of uranium, neptunium and plutonium nitrates at 90 °C in the presence of hydrazine hydrate allows one to prepare hydrated dioxides (U, Np, Pu)O2·nH2O which on heating to ~300 °C transmogrify into crystalline product of UO2, NpO2 and PuO2 solid solution. The technique of preparation of solid solutions of U and Pu dioxides is very promising as simple and effective method of production of MOX-fuel for. |
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