辐射研究与辐射工艺学报2025，Vol.43Issue(6)：16-28,13.DOI:10.11889/j.1000-3436.2025-0063
LiF-NaF-KF熔盐体系中Nd3+的氧化还原行为和电解分离
Electrochemical behavior and electrolytic separation of Nd3+in molten LiF-NaF-KF salt
摘要
Abstract
The electrolytic separation of neodymium(Nd),a fission product in Thorium-based Molten Salt Reactors(TMSR),is crucial for ensuring long-term reactor stability,enhancing fuel utilization,and minimizing radioactive waste.Considering the electrolytic separation characteristics of neodymium in a molten salt environment,this study investigates the electrochemical behavior and thermodynamic properties of NdF3 in a FLiNaK(mol ratio:46.5∶11.5∶42)molten salt system within the temperature range of 793 K to 853 K.The experimental results demonstrated that the reduction of Nd(III)to metallic neodymium on an inert tungsten electrode occurs via a single-step process,represented as Nd(III)+3e-→Nd(0).The diffusion coefficient(D)of Nd(III)ions in molten salt was determined using cyclic voltammetry.It was observed that D increased with rising temperature,and the diffusion activation energy of Nd(III)ions was calculated to be 115.23 kJ/mol.The equilibrium potential(Eeq)and standard electrode potential(E*0)of the Nd(III)/Nd(0)system were determined within the temperature range of 793 K to 853 K based on the open-circuit chronopotentiometric curve.Additionally,pulsed electrolytic deposition of neodymium was conducted at 793 K.X-ray diffraction analysis confirmed that the deposited product was metallic neodymium.Inductively coupled plasma optical emission spectrometry analysis of the molten salt before and after electrolysis revealed a significant decrease in the concentration of neodymium ions,further confirming the occurrence of Nd(III)electrodeposition.关键词
电化学/FLiNaK盐/Nd(Ⅲ)/Nd(0)/扩散系数/电沉积Key words
Electrochemical behavior/FLiNaK salt/Nd(Ⅲ)/Nd(0)/Diffusion coefficient/Electrodeposition分类
能源科技引用本文复制引用
雷敏,郑博文,徐彤彤,郭少强,邱杰..LiF-NaF-KF熔盐体系中Nd3+的氧化还原行为和电解分离[J].辐射研究与辐射工艺学报,2025,43(6):16-28,13.基金项目
陕西省科研项目(2023SYJ18) Supported by the Research Project of Shaanxi Province(2023SYJ18) （2023SYJ18）
