The influence of fluoride ions on the equilibrium between titanium ions and titanium metal in fused alkali chloride melts

Jianxun Song; Qiuyu Wang; Jinyu Wu; Shuqiang Jiao; Hongmin Zhu

doi:10.1039/c6fd00007j

journal article Jan 01, 2016

The influence of fluoride ions on the equilibrium between titanium ions and titanium metal in fused alkali chloride melts

Jianxun Song Qiuyu Wang

Jinyu Wu Shuqiang Jiao

Hongmin Zhu

Faraday Discussions Vol. 190 pp. 421-432 · Royal Society of Chemistry (RSC)

View at Publisher Save 10.1039/c6fd00007j

Abstract

KF is employed as a source of fluoride ions added to the melt to disclose the influence of fluoride on the disproportionation reactions of titanium ions, 3Ti2+ = 2Ti3+ + Ti, and 4Ti3+ = 3Ti4+ + Ti. The results reveal that the equilibrium transferred to the right direction for the first reaction and the apparent equilibrium constant increased sharply, mainly because of the formation of coordination compounds: TiFi3−i. The accurate values of the equilibrium constants referring to the formation reactions of Ti3+ + iF− = TiFi3−i (i = 1–6) in NaCl–KCl melt at 1023 K were evaluated with a best fit least squares method. It is also revealed that the stable states of the coordination compounds are TiF2+, TiF2+, TiF4− and TiF63−. Moreover, the Gibbs free energies for complex formation were estimated. Ti2+ was undetectable when the concentration of fluoride ion was high enough. The equilibrium constant for the formation reaction, Ti4− + 6F− = TiF62−, was evaluated. The equilibrium constant, Kc2, for the disproportionation reaction 4Ti3+ = 3Ti4+ + Ti, in chloride melt was determined as 0.015.

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References

Details

Published: Jan 01, 2016
Vol/Issue: 190
Pages: 421-432

Authors

J

Jianxun Song

School of Metallurgical and Ecological Engineering; University of Science and Technology Beijing; Beijing; China

Q

Qiuyu Wang

School of Metallurgical and Ecological Engineering; University of Science and Technology Beijing; Beijing; China

J

Jinyu Wu

School of Metallurgical and Ecological Engineering; University of Science and Technology Beijing; Beijing; China

S

Shuqiang Jiao

State Key Laboratory of Advanced Metallurgy; University of Science and Technology Beijing; Beijing; China

H

Hongmin Zhu

School of Metallurgical and Ecological Engineering; University of Science and Technology Beijing; Beijing; China; Department of Metallurgy

Funding

National Natural Science Foundation of China Award: 51322402

Cite This Article

Jianxun Song, Qiuyu Wang, Jinyu Wu, et al. (2016). The influence of fluoride ions on the equilibrium between titanium ions and titanium metal in fused alkali chloride melts. Faraday Discussions, 190, 421-432. https://doi.org/10.1039/c6fd00007j

The influence of fluoride ions on the equilibrium between titanium ions and titanium metal in fused alkali chloride melts

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