NdF_(3)在LiF熔盐中的溶解及离子结构  

Dissolution and ion structure of NdF_(3) in LiF molten salt

作　　者：付赞辉[1,2] 阙靓华 廖春发 王旭[1,2] 周迅 FU Zanhui;QUE Lianghua;LIAO Chunfa;WANG Xu;ZHOU Xun(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;National Rare Earth Functional Material Innovation Center,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]国家稀土功能材料创新中心,江西赣州341000

出　　处：《有色金属科学与工程》2024年第1期123-129,共7页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(52174335);国家自然科学基金资助项目(52074134)。

摘　　要：LiF-NdF_(3)熔盐体系中离子的构成形式对解析电解钕工艺的电解过程至关重要,本文采用冰点降低法分析LiF-NdF_(3)熔盐体系的离子结构。通过Temkin和Flood模型及热力学计算分析熔盐体系内可能存在的离子团簇,结果表明,NdF_(3)在LiF中的溶解模型符合TemkinⅠ、TemkinⅡ、TemkinⅥ、TemkinⅦ和FloodⅡ、FloodⅥ、FloodⅦ,在LiF-NdF_(3)熔盐体系中主要形成含有1~2个Nd^(3+)的分子团簇,NdF_(3)在LiF内溶解主要形成游离的Nd^(3+)、F-、Li^(+)以及Li^(+)·[NdF_(4)]^(-)、Li^(+)·[Nd2F7]-、2Li^(+)·[Nd_(2)F_(8)]^(2-)分子团簇。The constitution form of ions in the LiF-NdF_(3)molten salt system is very important for the analytical electrolytic reduction of neodymium electrode process.In this paper,the ion structure of LiF-NdF_(3)molten salt system was analyzed by cryoscopic method.The possible ion clusters in the molten salt system were analyzed by Temkin and Flood models and thermodynamic calculation.The results show that the dissolution model of NdF_(3)in LiF is consistent with TemkinⅠ,TemkinⅡ,TemkinⅥ,TemkinⅦ,and FloodⅡ,FloodⅥ,FloodⅦ.In LiF-NdF_(3)molten salt system with LiF as the solvent,1~2 Nd^(3+)ion clusters are formed in F-Nd ion clusters,and NdF_(3)is dissolved in LiF to form dissociative Nd^(3+),F-,Li^(+)and Li^(+)·[NdF_(4)]^(-),Li^(+)·[Nd2F7]-,as well as 2Li^(+)·[Nd_(2)F_(8)]^(2-)molecular clusters.

关 键 词：稀土熔盐 离子结构 冰点降低法 热力学计算 

分 类 号：TF123.13[冶金工程—粉末冶金]