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Modeling of the solubility of alumina in the NaF-AlF3 system at 1300 K

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Abstract

The experimentally well-known alumina solubility in the range of acidic to neutral cryolite-base melts has been modeled thermodynamically in terms of several oxyfluoride solutes. For an acidic melt, cryolite ratio r=1.5, the dominant solute is monoxygen Na2Al2OF6. In a less acidic regime, dioxygen Na2Al2O2F4 is dominant, whereas for neutral compositions (r=3), Na4Al2O2F6 starts to gain importance. The fit of the model to the experimental solubility data is virtually perfect. The values of the equilibrium constants for the formation of the individual solutes are reported. The formation and conversion of these oxyfluoride complexes serve as an effective buffer opposing change in the melt basicity.

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Authors and Affiliations

  1. the Department of Materials Science and Engineering, The Ohio State University, 43210, Columbus, OH

    Yunshu Zhang (Research Scientist), Yogesh Sahai (Professor) & Robert A. Rapp (Professor)

  2. GE Plastics, 43220, Worthington, OH

    Sanjeev Gupta (Engineer)

Authors
  1. Yunshu Zhang
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  2. Yogesh Sahai
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  3. Robert A. Rapp
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  4. Sanjeev Gupta
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Zhang, Y., Sahai, Y., Rapp, R.A. et al. Modeling of the solubility of alumina in the NaF-AlF3 system at 1300 K. Metall Mater Trans B 33, 315–319 (2002). https://doi.org/10.1007/s11663-002-0015-4

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  • DOI: https://doi.org/10.1007/s11663-002-0015-4

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