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The Development of CaO-SiO2-B2O3-based Fluorine-Free Mold Flux for a Continuous Casting Process

  • Special Issue: Revisiting Materials Challenges from the Perspective of Energy Applications
  • Published:
Metallurgical and Materials Transactions E

Abstract

Designing and developing high-performance fluorine-free (F-free) mold flux has become a hot topic in steel continuous casting processes, with concerns of environment protection and energy saving. In conventional commercial mold flux, fluorine plays important roles on the properties as it works as a fluxing agent; however, it tends to cause serious environmental and health problems. In this paper, a new F-free mold flux based on the CaO-SiO2-B2O3 slag system has been introduced through summarizing previous works. The melting temperature range of F-free mold flux decreases with the addition of Na2O/Li2O and B2O3; the viscosity and heat flux decrease with the increase of basicity and Na2O/Li2O, as well as the decrease of B2O3 contents. Also, the crystallization temperatures of F-free mold fluxes increase with the increase of basicity and Na2O/Li2O content. The analyses of EDS and XRD show that Ca11Si4B2O22 and Ca14Mg2(SiO4)8 are the two main precipitated crystalline phases in F-free mold fluxes, and that the Ca11Si4B2O22 is a common and stable crystalline phase in the designed F-free mold fluxes system that shows the potential to replace Ca4Si2O7F2 in conventional flourine-containing mold fluxes.

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Acknowledgments

The authors wish to thank the National Science Foundation of China (51504294, 51322405), and the Opening Foundation of the State Key Laboratory of Advanced Metallurgy (KF14-10) for support of this research.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Lejun Zhou & Wanlin Wang

Authors
  1. Lejun Zhou
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  2. Wanlin Wang
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Corresponding author

Correspondence to Wanlin Wang.

Additional information

Manuscript submitted February 15, 2016.

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Zhou, L., Wang, W. The Development of CaO-SiO2-B2O3-based Fluorine-Free Mold Flux for a Continuous Casting Process. Metallurgical and Materials Transactions E 3, 139–144 (2016). https://doi.org/10.1007/s40553-016-0080-2

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  • DOI: https://doi.org/10.1007/s40553-016-0080-2

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