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Interaction between UN and CdCl2 in molten LiCl-KCl eutectic. II. Experiment at 1023 K
Alexander Zhitkov,Alexei Potapov,Kirill Karimov,Anna Kholkina,Vladimir Shishkin,Alexander Dedyukhin,Yury Zaykov 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
The interaction between UN and CdCl2 in the LiCleKCl molten eutectic was studied at 1023 K. Thechlorination was monitored by sampling and recording the redox potential of the medium. At 1023 K thechlorination of UN with cadmium chloride in the molten LiCleKCl eutectic proceeds completely andresults in the formation of uranium chlorides. The melts of the LiCleKCleUCl3 or LiCleKCleUCl4 compositions can be obtained by the end of experiment depending on the presence of metallic cadmium inthe reaction zone. The higher the concentration of the chlorinating agent, the faster the reaction rate. At[CdCl2]/[UN] ¼ 1.65 (10% excess) the reaction proceeds to completion in about 7.5 h. At [CdCl2]/[UN] ¼ 7the complete chlorination takes 2.5e3 h.
Interaction between UN and CdCl<sub>2</sub> in molten LiCl-KCl eutectic. I. Experiment at 773 K
Zhitkov, Alexander,Potapov, Alexei,Karimov, Kirill,Shishkin, Vladimir,Dedyukhin, Alexander,Zaykov, Yury Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.1
The interaction between UN and CdCl<sub>2</sub> in the LiCl-KCl molten eutectic was studied at 773 K. The reaction was controlled by sampling the melt, as well as by analysis of the resulting precipitate. The process was shown to proceed according to several parallel reactions. The summary reaction was determined to have two stages: a fast one and a slow one. The 19-53% UN → UCl<sub>3</sub> conversion was obtained for the molar ratio of CdCl<sub>2</sub>/UN = 1.22-14.9. The rest of UN converts into the precipitate of complex composition (UNCl + U<sub>2</sub>N<sub>3</sub> + U<sub>4</sub>N<sub>7</sub> + UN<sub>2</sub>). The increase in the CdCl<sub>2</sub>/UN molar ratio from 1.22 to 14.9 resulted in the decrease in duration of the first "fast" stage of the process from 18 h to 1 h.