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April 27 th 2011, Liblice, Czech Republic

Electrochemical separation of selected fissile material and fission products representatives in molten fluoride melts NRI. April 27 th 2011, Liblice, Czech Republic. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis.

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April 27 th 2011, Liblice, Czech Republic

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  1. Electrochemical separation of selected fissile material and fission products representatives in molten fluoride meltsNRI April 27th 2011, Liblice, Czech Republic

  2. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Previous reports: problems with oxygen contamination, poor adhesion of the deposit when foil electrode was used, melt cluster concentrated with electroactive species when electrode with 3D-structure was used (spiral electrode). Both inert (W, Mo) and reactive (Ni) electrodes were used with no significant difference. • Improvement of the set-up tightness • Electrolysis with modulated current

  3. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Current pulse electrolysis • Change of the deposit morphology? • Better adhesion? • Better resolution? • Modulation parameters? • Inert vs. reactive electrode?

  4. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Electrode material: Mo, W, Ni Modulation: Systems: LiF-CaF2-UF4, LiF-NaF-KF-UF4, LiF-CaF2-UF4-GdF3

  5. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Black, compact deposit of metallic shine was obtained. Surface loses its shine when exposed to outer atmosphere. Nice reproducibility was obtained in the area of Ic2~ 175 mA/cm2 and tA1/tC2 ~ 0.05 - 0.1.

  6. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Ni foil

  7. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Mo foil

  8. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis Mo foil 2

  9. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis W rod

  10. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis

  11. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis

  12. Electrolytic deposition of uranium on nickel and molybdenum working electrodes by means of pulse-current electrolysis

  13. LiF-CaF2-PrF3 Straka, Korenko, Szatmáry, JRadioanal Nucl Chem, 2011, in press

  14. Electrochemistry in LiF-BeF2 LiF-BeF2-UF4 Straka, Korenko, Lisý, J Radioanal Nucl Chem, 2010, 284, 245 Straka, Korenko, Szatmáry, J Rare Earths, 2011, under review • Basic characterization of actinides and lanthanides in LiF-BeF2 nearly completed • - Diffusion coefficients of actinides and lanthanides are very similar to those in BeF2-free melts • It is not expected due to special nature of BeF2 20. 10. 2014 14

  15. Summary • Current pulse electrolysis tested in molten fluoride systems • Compared to classic potentiostatic and galvanostatic electrolytic set-ups: • better deposits, reproducible at certain parameters • Optimization of its parameters will supposedly lead to further improvement in terms of quality and quantity • LiF-BeF2 experiments

  16. Financial support

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