Advertisement

Metal Science and Heat Treatment

, Volume 61, Issue 1–2, pp 90–95 | Cite as

Highly Efficient and Environmental Process for Removing Alkali Metals from Aluminum Melt

  • Huosheng Wang
  • Gaosheng Fu
  • Chaozeng Cheng
  • Liandeng Wang
Article
  • 16 Downloads

A novel process for removing Na and Ca from electrolytic aluminum melt is suggested, where the flux is a mixture of AlF3 particles with argon. The technology does not employ chlorine, which eliminates the unfavorable consequences of its use, i.e., contamination of the environment and corrosion of the equipment. Aspin rotor is used to provide uniform distribution of AlF3 and argon in the aluminum melt. The efficiency of removal of alkali metals from the melt at different temperatures, aluminum masses and initial concentrations of Na and Ca is determined. An optimum concentration of the AlF3 addition in the aluminum melt is suggested.

Key words

electrolytic aluminum melt removal of alkali metals aluminum fluoride thermodynamics 

References

  1. 1.
    P. Waite, “A technical perspective on molten aluminum processing,” Light Metals, 841 – 848 (2001).Google Scholar
  2. 2.
    D. H. De Young, “Na and Ca pick-up from hall bath in ingot furnaces,” Light Metals, 647 – 654 (1997).Google Scholar
  3. 3.
    D. E. J. Talbot and C. E. Ransley, “The addition of bismuth to aluminum-magnesium alloys to prevent embrittlement by sodium,” Metall. Mater. Trans. A, 7, 1149 – 1154 (1977).Google Scholar
  4. 4.
    D. E. J. Talbot and D. A. Granger, “Effects of sodium and bismuth in aluminum-magnesium alloys,” JOM, 47(2), 44 – 46 (1995).CrossRefGoogle Scholar
  5. 5.
    A. Suzuki, L. C. Hong, A. Itoh, et al., “Ab-initio calculation of sodium segregation in aluminum grain boundaries” Mater. Trans. Jim., 40(11), 1193 – 1197 (1999).CrossRefGoogle Scholar
  6. 6.
    European Standard EN576. Aluminium and Aluminium Alloys-Unalloyed Aluminium Ingots for Remelting Specifications (2003).Google Scholar
  7. 7.
    J. Bildstein and I. Ventre, “Alpur technology present and future,” Light Metals, 755 – 763 (1993).Google Scholar
  8. 8.
    W. C. Eister and W. R. Krumme, “An evaluation of a snif unit as an inclusion removal and degassing device,” Light Metals, 1171 – 1177 (1991).Google Scholar
  9. 9.
    C. J. English and D. B. Rogers, “The heat Mint III E,” Light Metals, 1165 – 1169 (1991).Google Scholar
  10. 10.
    D. C. Chesonis, D. H. DeYoung, E. Elder, and R. O. Wood, “Metal quality comparison of alcan compact degasser and SNIF at Alcoa mount holly casthouse,” Light Metals, 745 – 750 (2000).Google Scholar
  11. 11.
    P. Robichaud, C. Dupuis, A. Mathis at al., “A chlorine-free technology for metal treatment,” Light Metals, 739 – 744 (2011).Google Scholar
  12. 12.
    D. H. DeYoung, “Salt fluxes for alkali and alkaline earth element removal from molten aluminum,” in: 7th Australian Asian Pacific Conf., Hobart, Australia, TMS (2001), pp. 99 – 133.Google Scholar
  13. 13.
    D. H. DeYoung and R. Levesque, “Air emission from rotary gas and rotary salt injection furnace fluxing processes,” in: Aluminum Cast House Technology, Melbourne, Australia, TMS (2005), pp. 7 – 16.Google Scholar
  14. 14.
    B. Landolt, Thermodynamic Properties of Inorganic Material, Scientific Group Thermodata Europe (SGTE), Springer-Verlag, Berlin-Heidelberg (1999).Google Scholar
  15. 15.
    O. Knacke, O. Kubaschewski, and K. Hasselman, Thermochemical Properties of Inorganic Substances, Springer-Verlag, Berlin (1991).Google Scholar
  16. 16.
    I. Barin, O. Knacke, and O. Kubaschewski, Thermodynamic Properties of Inorganic Substances, Springer-Verlag, Berlin (1973).Google Scholar
  17. 17.
    Y. Ohno, “The latest molten metal refining processes in cast shop,” J. Japan Inst. Light Metals, 51, 134 – 137 (2001).Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Huosheng Wang
    • 1
    • 2
  • Gaosheng Fu
    • 1
  • Chaozeng Cheng
    • 1
  • Liandeng Wang
    • 3
  1. 1.School of Materials Science and EngineeringFuzhou UniversityFuzhouChina
  2. 2.School of Materials Science and EngineeringFujian University of TechnologyFuzhouChina
  3. 3.School of Mechanical Engineering and AutomationFuzhou UniversityFuzhouChina

Personalised recommendations