K 84 Krotov, V. Ye. Regularities of cathode deposit formation during simultaneous reduction and exchange reactions. The mechanism of UO2–ZrO2 cathode deposit formation / V. Ye. Krotov // Electrochimica Acta. - 2014. - Vol. 115. - P. 28-30. - Bibliogr. : p. 30 (8 ref.) . - Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ОСАЖДЕНИЕ КАТОДНОЕ -- ЭЛЕКТРОЛИТ РАСПЛАВЛЕННЫЙ -- UO2–ZrO2 Аннотация: This paper describes an empirically demonstrated mechanism of UO2–ZrO2 cathode deposit formation during the (NaCl–KCl)equim.–UO2Cl2–ZrCl4 melts electrolysis. The first layer of the cathode product was formed through UO22+ ion reduction to uranium dioxide followed by an exchange reaction with Zr4+ ions, which are present in the electrolyte. The subsequent reactions proceeded through simultaneous reduction and exchange reactions at the cathode. |
K 84 Krotov, V. Ye. Regularities of cathode deposit formation during simultaneous reduction and exchange reactions. Influence of the electrolysis conditions on the concentration of components in the UO2-ZrO2 cathode deposit / V. Ye. Krotov, Ye. S. Filatov // Electrochimica Acta. - 2014. - Vol. 116. - P. 484-489. - Bibliogr. : p. 489 (25 ref. ) . - ISSN 0013-4686 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ОСАЖДЕНИЕ КАТОДНОЕ -- КАТОДНЫЙ ОСАДОК -- ЭЛЕКТРОЛИЗ Аннотация: This paper represents the experimental data on a quantitative composition of cathode UO2-ZrO2 deposits, which are formed through simultaneous electrolytic reduction of UO22+ ions to UO2 and the exchange between the UO2 and Zr4+ ions present in the molten (NaCl-KCl) equim.-UO2Cl2-ZrCl4 electrolyte. A scheme for the formation of UO2-ZrO2 deposits containing up to 98 mol. % of ZrO2 is provided. The fraction of zirconium dioxide decreased as the ZrCl4 concentration decreased and as current density and electrolysis times increased. The electrolyte temperature influence on the average composition of the UO2-ZrO2 deposit was found to be insignificant. The structure of the cathode deposit was analyzed. The established regularities are explained by the change in the reduction and exchange reaction rates at the cathode. |