Dongsheng Jiang,Zhuan Zhao,Huan Zhang,Ruifang Wang,Jianxun Song,Yusi Che,Jilin He
In this study, metallic niobium was produced by electrolysis in a NaCl-KCl melt using NbCxOy as a soluble anode. The anodic dissolution behavior of NbCxOy in the NaCl-KCl melt and the reduction mechanism of niobium ions were examined using cyclic voltammetry, linear sweep voltammetry, square wave voltammetry, electrochemical impedance spectroscopy, and chronopotentiometry. The results revealed that the electrode reduction process of niobium ion was Nb(Ⅴ) → Nb(Ⅲ) → Nb(Ⅰ) → Nb, with these reactions being diffusion-controlled. During successive multiturn scans, the reduction process of niobium ions favored the pathway of Nb(V) → Nb(III) → Nb. As the electrolytic voltage increased, the dissolution of niobium ions in NbCxOy also increased, with a tendency to oxidize into high-valence niobium ions. Constant-current electrolysis in a NaCl-KCl melt, using NbCxOy as the anode and Mo rods as the cathode resulted in the deposition of mainly metallic niobium on the Mo cathode, manifesting that NbCxOy can be used to extract metallic niobium. This study provides a theoretical foundation for the realization of a green and efficient extraction process for metallic niobium.
Qinglin Zeng,Bochao Xu,Zepeng Lv,Shaolong Li,Jilin He,Jianxun Song
This study demonstrates the synthesis of a NbC x O y solid solution through carbothermic reduction and the subsequent extraction of metallic niobium through molten salt electrolysis. Thermodynamic analysis and carbothermic reduction were conducted to determine the optimal conditions for synthesizing the NbC x O y solid solution at different compositions, enabling precise control over their composition. Furthermore, metallic niobium was produced via the molten salt electrolysis of the selected NbC x O y solid solution for 16 h at 2.9 V in the NaCl–KCl eutectic molten salt at 750 °C.
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