Skip to main content
SpringerLink
Log in

Modeling the dependence of alumina solubility on temperature and melt composition in cryolite-based melts

  • Published:
Metallurgical and Materials Transactions B Aims and scope Submit manuscript

Abstract

The solubility of alumina in NaF-AlF3 melts was calculated and modeled thermodynamically for the temperature range of 1240 to 1300 K (967 °C to 1027 °C). The solute complexes of alumina in the cryolite melts were identified to be Na2Al2OF6 (acidic solute), Na2Al2O2F4 (neutral solute), and Na4Al2O2F6 (basic solute). The assumption that the oxygen-free solute species in solution were Na3AlF6 and NaAlF4 was supported by the modeling results. The equilibrium constants for the formation reactions of the solutes were calculated and the corresponding ΔG 0 f values were evaluated as a function of temperature. The interaction derivatives (∂ ln a NaF/∂x add, ∂ ln a NaF/∂x add, and ∂ ln a AlF3/∂x add) for small additions of LiF, CaF2, and MgF2 to the NaF-AlF3-Al2O3 ternary system were also estimated as a function of temperature and melt composition.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Y.S. Zhang, S. Gupta, Y. Sahai, and R.A. Rapp: Metall. Mater. Trans. B, 2002, vol. 33B, pp. 315–19.

    Article  CAS  Google Scholar 

  2. Y.S. Zhang, X. Wu, and R.A. Rapp: Metall. Mater. Trans. B, 2003, vol. 34B, pp. 235–42.

    Article  CAS  Google Scholar 

  3. E.W. Dewing: Proc. 5th Int. Symp. on Molten Salts, M.L. Saboungi, D.S. Newman, K. Johnson, and D. Inman, eds., The Electrochemical Society, Pennington, NJ, 1986, p. 262.

    Google Scholar 

  4. N.X. Feng and H. Kvande: Acta Chem. Scand., 1986, vol. A40, pp. 622–30.

    CAS  Google Scholar 

  5. H. Zhou, O. Herstad, and T. Ostvold: Light Met., 1992, pp. 511–20.

  6. B. Gilbert and T. Materne: Appl. Spectrosc., 1990, vol. 44, pp. 299–305.

    Article  ADS  CAS  Google Scholar 

  7. E. Tixhon, E. Robert, and B. Gilbert: Appl. Spectrosc., 1994, vol. 48, pp. 1477–82.

    Article  ADS  CAS  Google Scholar 

  8. E. Robert, J.E. Olsen, B. Gilbert, and T. Ostvold: Acta Chem. Scand., 1997, vol. 51, pp. 379–86.

    CAS  Google Scholar 

  9. E. Robert, V. Lacassagne, C. Bessada, D. Massiot, B. Gilbert, and J.P. Coutures: Inorg. Chem., 1999, vol. 39, pp. 214–17.

    Article  Google Scholar 

  10. M.H. Brooker, J. Johnson, A. Shabana, and J. Wang: Proc. 9th Int. Symp. on Molten Salts, C.L. Hussey, D.S. Newman, G. Mamantov, and Y. Ito, eds., The Electrochemical Society, Pennington, NJ, 1994, vol. 94–13, p. 235.

    Google Scholar 

  11. M.H. Brooker: Proc. 11th Int. Symp. on Molten Salts, P.C. Trulove, H.C. Delong, G.R. Stafford, and S. Deki, eds., The Electrochemical Society, Pennington, NJ, 1998, vol. 98–11, p. 597.

    Google Scholar 

  12. M.H. Brooker, R.W. Berg, J.H. von Barner, and N.L. Bjerrum: Inorg. Chem., 2000, vol. 39, pp. 3683–89.

    Google Scholar 

  13. S.K. Ratkje, S.J. Cyvin, and B. Hafskjold: Appl. Spectrosc., 1993, vol. 47, pp. 375–76.

    Article  ADS  CAS  Google Scholar 

  14. J. Stebbins, I. Farnan, N. Dando, and S-Y. Tzeng: J. Am. Ceram. Soc., 1992, vol. 75, pp. 3001–06.

    Article  CAS  Google Scholar 

  15. E. Skybakmoen, A. Solheim, and A. Sterten: Metall. Mater. Trans. B, 1997, vol. 28B, pp. 81–86.

    CAS  Google Scholar 

  16. A. Solheim, S. Rolseth, E. Skybakmoen, L. Stoen, A. Sterten, and T. Store: Light Met., 1995, pp. 451–60.

  17. A. Solheim and A. Sterten: Light Met., 1999, pp. 445–52.

  18. E. Dewing: Metall. Trans. B, 1989, vol. 20B, pp. 675–77.

    CAS  Google Scholar 

  19. B. Gilbert, E. Robert, E. Tixhon, J.E. Olsen, and T. Ostvold: Inorg. Chem., 1996, vol. 35, pp. 4198–4210.

    Article  PubMed  CAS  Google Scholar 

  20. A. Sterten, K. Hamberg, and I. Maeland: Acta Chem. Scand., 1982, vol. A36, pp. 329–44.

    Article  CAS  Google Scholar 

  21. M.V. Chase, Jr.: NIST-JANAF Thermochemical Tables, 4th ed., National Institute of Standards and Technology, Gaitherburg, MA, 1998.

    Google Scholar 

  22. A. Sterten and I. Maeland: Acta Chem. Scand., 1985, vol. A39, pp. 241–45.

    CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

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

    Yunshu Zhang (Research Scientist) & Robert A. Rapp (Professor Emeritus)

Authors
  1. Yunshu Zhang
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Robert A. Rapp
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Zhang, Y., Rapp, R.A. Modeling the dependence of alumina solubility on temperature and melt composition in cryolite-based melts. Metall Mater Trans B 35, 509–515 (2004). https://doi.org/10.1007/s11663-004-0051-3

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11663-004-0051-3

Keywords

Search

Navigation