Electrochemical extraction of strontium from molten salts using reactive zincand aluminum electrodes  

作　　者：Yongcheng Zhang Taiqi Yin Lei Zhang Xiaochen Zhang Tao Bo Xiaoli Tan Mei Li Wei Han 

机构地区：[1]Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [2]College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China [3]MOE Key Laboratory of Resources and Environmental System Optimization,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China [4]Qianwan Institute of CNITECH,Ningbo 315336,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第4期892-901,共10页矿物冶金与材料学报(英文版)

基　　金：financially supported by the National Postdoctoral Program for Innovative Talents, China (No. BX2021327);the National Natural Science Foundation of China (Nos. 22206194 and U2267222);the Ningbo Natural Science Foundation of China (No. 2023J337);the Yongjiang Talent Introduction Programme, China (No. 2 021A-161-G)。

摘　　要：Herein, the electrochemical behaviors of Sr on inert W electrode and reactive Zn/Al electrodes were systematically investig-ated in LiCl–KCl–SrCl2molten salts at 773 K using various electrochemical methods. The chemical reaction potentials of Li and Sr on re-active Zn/Al electrodes were determined. We observed that Sr could be extracted by decreasing the activity of the deposited metal Sr onthe reactive electrode, although the standard reduction potential of Sr(II)/Sr was more negative than that of Li(I)/Li. The electrochemicalextraction products of Sr on reactive Zn and Al electrodes were Zn13Sr and Al4Sr, respectively, with no codeposition of Li observed.Based on the density functional theory calculations, both Zn13Sr and Al4Sr were identified as stable intermetallic compounds with Zn-/Al-rich phases. In LiCl–KCl molten salt containing 3wt% SrCl2, the coulombic efficiency of Sr in the Zn electrode was ~54%. The depolar-ization values for Sr on Zn and Al electrodes were 0.864 and 0.485 V, respectively, exhibiting a stronger chemical interaction between Znand Sr than between Al and Sr. This study suggests that using reactive electrodes can facilitate extraction of Sr accumulated while elec-trorefining molten salts, thereby enabling the purification and reuse of the salt and decreasing the volume of the nuclear waste.

关 键 词：STRONTIUM reductive extraction molten salt depolarization effect reactive electrode 

分 类 号：O64[理学—物理化学]