Influence of Al2O3 Level in CaO-SiO2-MgO-Al2O3 Refining Slags on Slag/Magnesia-Doloma Refractory Interactions
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The influence of the Al2O3 level in CaO-SiO2-MgO-Al2O3 (CSMA) stainless steel refining slags on the degradation of magnesia-doloma refractories was investigated through static refractory finger corrosion tests. The tests were performed at 1620 °C under Ar atmosphere, using slags with Al2O3 contents of 5, 10, and 20 wt pct, respectively. The results indicate that the formation of 2CaO·SiO2 at the slag/refractory interface was suppressed by increasing the Al2O3 content to 20 wt pct, thereby changing the corrosion mechanism from an indirect dissolution to a direct dissolution of CaO and MgO from the refractories. The increased solubility limit of MgO by the Al2O3-rich CSMA slags results in an overall higher corrosion rate of the MgO-doloma refractory.
The authors are grateful for the financial support from Posco and the discussion with Professor J.H. Park, University of Ulsan.
- 2.A. Buhr: CN-Refract., 1999, vol. 6, pp. 19–30.Google Scholar
- 3.Z. Wei: Naihuo Cailiao/Refractor., 2002, vol. 36, pp. 224–25 and 28.Google Scholar
- 8.S. Parada, S. Smets, P.T. Jones, M. Guo, W. Patrick, J. Weytjens, and G. Heylen: Ironmak. Steelmak., 2003, vol. 30, pp. 33–39.Google Scholar
- 13.M. Guo, P.T. Jones, S. Parada, E. Boydens, J. Van Dyck, B. Blanpain, and P. Wollants: Ceram. Int., 2006, vol. 33, pp. 3831–43.Google Scholar
- 17.Verein Deutscher Eisenhüttenleute (VDEh): Slag Atlas, Verlag Stahleisen GmbH, Düsseldorf, 1995, pp. 156–61.Google Scholar