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Alumina Solubility in KF-NaF-AlF3-Based Low-Temperature Electrolyte

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Abstract

KF-NaF-AlF3-based electrolyte is a promising low-temperature electrolyte for aluminum reduction. Alumina solubility in molten KF-NaF-AlF3-based electrolyte was determined as a function of the melt composition and temperature by measuring the weight loss of a rotating corundum disk and by using a LECO RO500 oxygen analyzer (LECO Corporation, St. Joseph, MI). The investigated temperature range is 1023 K to 1073 K (750 °C to 800 °C), and the total cryolite molar ratio (CRt = ([KF] + [NaF])/[AlF3]) is 1.3 to 1.5; the content of NaF ranges from 0 mol pct to 50 mol pct. The effect of temperature, CaF2, and LiF on alumina solubility is discussed as well.

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Acknowledgment

Financial support from Chalco is acknowledged.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, P.R. China

    Hengwei Yan (Research Scholar) & Shazi Chen (Senior Engineer)

  2. Zhengzhou Research Institute of CHALCO, Shangjie, Zhengzhou, 450041, P.R. China

    Hengwei Yan (Research Scholar), Jianhong Yang (Vice President) & Wangxing Li (President)

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  1. Hengwei Yan
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  2. Jianhong Yang
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  4. Shazi Chen
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Correspondence to Hengwei Yan.

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Manuscript submitted February 13, 2011.

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Yan, H., Yang, J., Li, W. et al. Alumina Solubility in KF-NaF-AlF3-Based Low-Temperature Electrolyte. Metall Mater Trans B 42, 1065–1070 (2011). https://doi.org/10.1007/s11663-011-9535-0

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