Electrochemistry of Hf(Ⅳ)in NaCl-KCl-Na-K_(2)HfF_(6) molten salts  

作　　者：Yan-ke Wu Guo-qing Yan Song Chen Li-jun Wang 

机构地区：[1]GRINM Resources and Environment Tech.Co.,Ltd,Beijing 101407,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第12期1644-1649,共6页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51204021)。

摘　　要：The cathodic reduction mechanism of Hf(Ⅳ)ions in a fused Na Cl–KCl–Na F–K_(2) HfF_(6) salt system was studied in various Na F concentrations at 1073 K to obtain a purified dendritic Hf metal.The results of cyclic voltammetry and square wave voltammetry indicated that the reduction process comprised two steps of Hf(Ⅳ)→Hf(Ⅱ)and Hf(Ⅱ)→Hf at low Na F concentrations(0<molar ratio of[F-/Hf 4+]≤17.39)and one step of Hf(Ⅳ)→Hf at high Na F concentrations(17.39<molar ratio of[F-/Hf 4+]<23.27).The structure and morphology of the deposits obtained in potentiostatic electrolysis in the one-step reduction process were analyzed and verified by X-ray diffraction,scanning electron microscopy,and energy dispersive X-ray spectrometry.In the one-step reduction process,the disproportionation reaction between the Hf metal and Hf complex ions was inhibited,and a large dendrite Hf metal was achieved in molten salt electrorefining.

关 键 词：electrochemical behavior cyclic voltammetry potentiostatic electrolysis dendritic hafnium molten salts 

分 类 号：TF841.4[冶金工程—有色金属冶金]