Maslennikova Anna A, Mushnikov Peter N, Dub Alexey V, Tkacheva Olga Yu, Zaikov Yury P, Liu Ya-Lan, Shi Wei-Qun
Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences, Academicheskaya Str., 20, 620990 Ekaterinburg, Russia.
JSC "Science and Innovations", State Corporation Rosatom, 32/2 Kadashevskaya Quay, 115035 Moscow, Russia.
Materials (Basel). 2023 Jun 5;16(11):4197. doi: 10.3390/ma16114197.
The present paper is dedicated to the quantitative determination of oxygen-containing impurities in the LiF-NaF-KF eutectic using electrochemical (cyclic and square-wave voltammetry) and reduction melting methods. The LiF-NaF-KF melt was analyzed before and after purifying electrolysis. The amount of oxygen-containing impurities removed from the salt during purification was determined. It was found that after electrolysis, the concentration of oxygen-containing impurities decreased by 7 times. The results obtained via electrochemical techniques and reduction melting were well-correlated, which made it possible to evaluate the quality of the LiF-NaF-KF F melt. To verify the analysis conditions, mechanical mixtures of LiF-NaF-KF containing LiO were analyzed using the reduction melting method. The oxygen concentration in the mixtures varied from 0.672 to 2.554 wt. %. Based on the analysis results, the dependence approximated by the straight line was obtained. These data may be used to draw calibration curves and to further develop the procedure of oxygen analysis of fluoride melts.
本文致力于采用电化学方法（循环伏安法和方波伏安法）以及还原熔融法对LiF-NaF-KF共晶中的含氧杂质进行定量测定。在净化电解前后对LiF-NaF-KF熔体进行了分析。测定了净化过程中从盐中去除的含氧杂质的量。结果发现，电解后含氧杂质的浓度降低了7倍。通过电化学技术和还原熔融获得的结果具有良好的相关性，这使得评估LiF-NaF-KF熔体的质量成为可能。为了验证分析条件，使用还原熔融法对含有LiO的LiF-NaF-KF机械混合物进行了分析。混合物中的氧浓度在0.672至2.554 wt.%之间变化。根据分析结果，得到了由直线近似的依赖关系。这些数据可用于绘制校准曲线，并进一步完善氟化物熔体中氧分析的程序。
