Dissolution and ion structure of NdF3 in LiF molten salt
The constitution form of ions in the LiF-NdF3 molten salt system is very important for the analytical electrolytic reduction of neodymium electrode process.In this paper,the ion structure of LiF-NdF3 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 NdF3 in LiF is consistent with TemkinⅠ,Temkin Ⅱ,Temkin Ⅵ,Temkin Ⅶ,and Flood Ⅱ,Flood Ⅵ,Flood Ⅶ.In LiF-NdF3 molten salt system with LiF as the solvent,1～2 Nd3+ ion clusters are formed in F-Nd ion clusters,and NdF3 is dissolved in LiF to form dissociative Nd3+,F-,Li+ and Li+·[NdF4]-,Li+·[Nd2F7]-,as well as 2Li+·[Nd2F8]2-molecular clusters.
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