Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 32    No. 8    August 2022

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Effect of fluoride addition on electrochemical behaviors of V(III) in molten LiCl-KCl
Rui YUAN1, Cheng Lü1, He-li WAN2, Shao-long LI1, Yu-si CHE1, Ji-lin HE1, Jian-xun SONG1

1. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China;
2. National Engineering Laboratory of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China

Abstract:X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were used to analyze the complexes in LiCl-KCl eutectic salt containing VCl3 and KF. The additional fluoride ions would replace chloride ions and combine with V(III) to form VF63-. The electrochemical behavior of V(III) was evaluated under condition of the molar concentration ratio of F- to Vn+ (α) equal to 0:1, 1:1, 2:1, 5:1, 20:1 and 50:1, respectively. The results showed that a new reduction step appeared: VF63-→V2+, and the reduction mechanism of vanadium ions became more complicated. The metallic vanadium was deposited on the tungsten electrode at -2.90 V in the LiCl-KCl melts for 6 h, and the products were characterized by SEM-EDS. It was indicated that the particle size of the product decreased with adding fluoride ions for the forming of the coordination compound VF63-.


Key words: V(III) ion; molten salt; electrochemical behavior; reduction mechanism; complex

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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