The reductive extraction behavior of Ln (Ce,Sm) and its on-line monitoring were explored in LiClKCl/BiLi system. According to calibration curve, the relationship of peak current and concentration of Ln (Ce,Sm) measured by square wave voltammetry, the calculated Ln (III) concentration is almost consistent with that analyzed by ICP-AES, and the relative average error is about 5.37%. The effects of Li content in BiLi alloys, temperature and stirring speed on extraction rates, efficiencies and distribution ratios for Ce and Sm were determined, and found that the extraction rates, efficiencies and distribution ratios for Ce and Sm increase with the increasing the temperature, content of Li in BiLi alloys and stirring speed. The extraction rates and efficiencies for Ln from LiClKClLnCl₃ molten salts are higher than those for Ln from LiClKClCeCl₃SmCl₃ molten salts, and the ones for Ce are much larger than those for Sm due to the formation of Sm (II) checked using XPS and linear sweep voltammetry. The produced Sm (II) could consume some reduced Sm metal: $2\text{Sm(III)}+\text{Sm}=3\text{Sm(II)}$, resulting in the decrease of the extraction rate, efficiency and distribution ratios of Sm. The experimental results showed the feasibility of on-line monitoring of reductive extraction process of Ln in LiCL-KCl/BiLi system by electrochemical technique.

在LiCl KCl / Bi Li体系中探索了Ln（Ce，Sm）的还原萃取行为及其在线监测。根据标定曲线，用方波伏安法测得的峰值电流与Ln（Ce，Sm）浓度的关系，计算出的Ln（III）浓度与ICP-AES分析的结果几乎一致，相对平均误差约为5.37％。测定了Bi Li合金中Li的含量，温度和搅拌速度对Ce和Sm的萃取率，效率和分布比的影响，发现随着温度的升高，Ce和Sm的萃取率，效率和分布比增加。 ，Bi Li合金中Li的含量和搅拌速度。LiCl萃取Ln的速率和效率。KCl LnCl ₃熔盐比LiCl KCl CeCl ₃ SmCl ₃熔盐中的Ln高，而Ce的盐则比Sm大得多，这是由于使用XPS和线性扫描伏安法检测到的Sm（II）的形成。产生的Sm（II）可能消耗一些还原的Sm金属：$\mathrm{2个}\text{Sm（III）}+\text{m}=3\text{Sm（II）}$，导致Sm的提取率，效率和分配比降低。实验结果表明，通过电化学技术在线监测LiCL-KCl / Bi Li体系中Ln的还原萃取过程是可行的。