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Report No.
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Preparation and characterization of dicesium tetravalent plutonium hexanitrate

Nakahara, Masaumi; Nomura, Kazunori  ; Washiya, Tadahiro ; Chikazawa, Takahiro*; Hirasawa, Izumi*

Characterization of Cs and Pu(IV) nitrate complex was examined to separation from the UNH crystal. This complex is obtained as a precipitate by mixing dissolver solution of MOX fuel and CsNO$$_{3}$$ solution, which was identified to dicesium tetravalent plutonium hexanitrate, Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ by concentration analysis and XRD. The precipitate has a tendency to be generated at high HNO$$_{3}$$ condition. Thermal analysis shows that the precipitate is stable below 245 $$^{circ}$$C, and a weight loss of about 10.29% is observed at 245 $$^{circ}$$C. This result corresponds to the decomposition of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ to Cs$$_{2}$$PuO$$_{2}$$(NO$$_{3}$$)$$_{4}$$. According to these properties, the UNH crystal can be melted at 60 $$^{circ}$$C to 100 $$^{circ}$$C, and separated from the Pu(IV) and Cs complex by a filtration. A new technology of crystal purification method aimed at higher decontamination of UNH crystal in the U crystallization process is proposed.

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Category:Chemistry, Physical

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