It is found that lanthanum species can exist in the form of LaF₆^3- in FLiNaK (46.5 LiF-11.5 NaF-42 KF, mol%) molten salt in previous studies. The understanding of transport and reaction kinetics parameters of LaF₆^3- ions in FLiNaK molten salt is essential for the electrochemical separation of lanthanum from FLiNaK melt to achieve the coolant clean-up in fluoride salt cooled high-temperature reactor (FHR). Through conducting chronopotentiometry tests, the diffusion coefficients of LaF₆^3- ions in FLiNaK molten salt at the temperature range of 923 K to 1023 K were determined. By conducting potentiodynamic polarization measurements at different concentrations and temperatures, the exchange current density, reaction rate constant, and charge transfer coefficient were obtained. The experiment data of potentiodynamic polarization were analyzed using a non-simplified electrode kinetics equation which incorporates both mass transfer and reaction kinetics.

在以前的研究中，发现镧物种可以以LaF ₆ ^3-的形式存在于FLiNaK（46.5 LiF-11.5 NaF-42 KF，mol％）熔融盐中。理解FLiNaK熔盐中LaF ₆ ^3-离子的输运和反应动力学参数对于从FLiNaK熔体中电化学分离镧以在氟化物盐冷却的高温反应器（FHR）中实现冷却液净化至关重要。通过计时电位测试，LaF ₆ ^3-的扩散系数确定了FLiNaK熔融盐中923 K至1023 K温度范围内的离子。通过在不同的浓度和温度下进行电位动力学极化测量，获得了交换电流密度，反应速率常数和电荷转移系数。使用非简化的电极动力学方程分析了电位动力学极化的实验数据，该方程同时包括了传质和反应动力学。