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The Solubility of Aluminum in Cryolite-Based Electrolyte-Containing KF

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Abstract

The solubility of aluminum in NaF-AlF3-CaF2-KF-A12O3 electrolyte system at 1253 K (980 °C) has been measured by the analysis of quenched samples saturated with aluminum. The content of the dissolved metal in the quenched melt was determined by collecting the volume of hydrogen gas when a finely crushed sample is treated with HCl. Addition of 0 to 5 pct KF has no obvious effect on the solubility of aluminum in cryolite-based melts with molar ratio of NaF/AlF3 (cryolite ratio) ranging from 2.2 to 3.0. The solubility of aluminum increases from 0.015 to 0.026 wt pct with cryolite ratio increases from 2.2 to 4.0 in the NaF-AlF3-5 wt pct CaF2-3 wt pct A12O3 electrolyte at 1253 K (980 °C). Aluminum solubility was affected by both chemical replacement reaction of Al + 3NaF = AlF3 + 3Na and physical dissolution.

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Acknowledgments

The authors wish to express their thanks to Professor Mark Taylor from the University of Auckland and Dr. Xiangwen Wang from Alcoa for valuable suggestions and discussions. The authors would like to acknowledge the financial support provided by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAE08B01), the National Natural Science Foundation of China (Grant Nos. 51322406, 51434005, 51474060, 51574070), and the NEU foundation (No. N130402011).

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  1. Yu Zhang (Master Degree Student, Ph. D. Student)

    Present address: Tianjin University, Tianjin, 300072, China

Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110004, China

    Yu Zhang (Master Degree Student, Ph. D. Student), Jiangyu Yu (Research Assistant), Bingliang Gao (Professor), Yibai Liu (Undergraduate Student), Xianwei Hu (Associate Professor), Zhongning Shi (Professor) & Zhaowen Wang (Professor)

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  1. Yu Zhang
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  2. Jiangyu Yu
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  3. Bingliang Gao
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Correspondence to Bingliang Gao.

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Manuscript submitted August 16, 2015.

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Zhang, Y., Yu, J., Gao, B. et al. The Solubility of Aluminum in Cryolite-Based Electrolyte-Containing KF. Metall Mater Trans B 47, 1296–1301 (2016). https://doi.org/10.1007/s11663-015-0572-y

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