Investigations of Calcium Aluminate Slag Penetration to MgO Monolithic Refractories in Steelmaking Process

Document Type: Research note

Authors

1 Material and Energy Research Center, P.O. Box 14155-4777 Tehran, Iran

2 Department of Mechanical Engineering, State University of New York, USA

3 School of Materials Science and Engineering, UNSW, Sydney, Australia

Abstract

In this study, slag penetration into a magnesia refractory monolithic was investigated by the crucible test method. A synthetic calcium aluminate slag system has been used to study commercial magnesia mix refractory for 1, 2, 3, 4, 5 and 6 hours at 1450°C and 1600°C.
It has been shown that the penetration rate is controlled by a diffusion mechanism at 1450°C. In this case, capillaries are the main channels of initial slag penetration into the refractory. In the penetration process of the slag system, calcium silicate was formed on the surfaces of MgO grains at 1450°C and around them by reaction between grain boundary and mayenite, as a main phase of slag with a low melting point.
Dissolution of the refractory components in the slag could be supported by the penetration process at 1600°C. In this case, dissolution of the refractory components in the slag not only makes new open channels, but also changes the local slag composition, resulting in an increase in surface tension and viscosity of the slag.

Keywords


1] W. E. Lee andS. Zhang; International Materials Reviews, 44 (1999), 77.

[2] K. Mukai, Z. Tao, K. Goto, Z. Li, T. Takashima, Refractories (Tokyo), 53(2001), 390.

[3] P. Zhang and S. Seetharaman, J. Am. Ceram. Soc., 77(1994), 970.

[4] Z. Tao, K. Mukai, H. Yonezawa and Y. Yoshimura, J. Tech. Assoc. Refract.Japan, 20(2000), 10.

[5] S. Zhang, W. E. Lee and N. Li, Proc. of Conf. ‘UNITECR '01’, Unified Int. Tech. Conf. on Refractories.7th Biennial Worldwide Congress, Vol. 1, Cancun 4-7,( 2001), 65.

[6] K. Matsu, F. Kawano and K. Nibu, Refractories (Tokyo), 43(1991), 42.

[7] S. Zhang, H. Sarpoolaky, N. J. Marriott and W. E. Lee, British Ceramic Transactions, 99(2000), 248.

[8] L. Molnar, P. Vadasz and M. Kozlovsky, Ceramics-Silikaty, 37(1993), 121.

[9] J-H. Woo, D-H. Kim and S-M. Kim, Journal of the Korean Institute of Metals and Materials (South Korea), 39(2001), 835.

[10] T. Matsui, K. Hiragushi, T. Ikemoto and K. Sawano, J. Tech. Assoc. Refract.Japan, 22(2002), 302.

[11] Z. Yu, K. Mukai, K. Kawasaki and I. Furusato; Journal of the Ceramic Society ofJapan, 101(1993), 533.

[12] H. Fukuyama, J. R. Donald and J. M. Toguri, J. Am. Ceram. Soc., 80(1997), 2229.

[13] T. Matsui, K. Hiragushi, T. Ikemoto and K. Sawano, Journal of the Technical Association of Refractories,Japan, 23(2003), 11.

[14] L. Zhao and V. Sahajwalla, ISIJ International, 43(2003), 1.

[15] V. Sahajwalla, C. Wu, R. Khanna, N. S. Chaudhury and J. Spink; ISIJ International, 43(2003), 1309.

[16] M. H. Amin, B. Arfaei and A. Kazemzadah; Proc. of the 9th International Chemistry Conference in Africa, University ofDar Es Salaam, (2005), 14-SL18.

[17] M. H. Amin, Z. Nemati and B. Akbari; Proc. of the 5th Iranian Ceramic Congress, Iran University of Science and Technology, Iran, (2004), 11.

[18] M. H. Amin and B. Arfaei, Proc. of the 5th European Continuous Casting Conference, Nice,France, (2005).

[19] M. H. Amin and B. Arfaei, Proc. of Iranian Steel Symposium 83, Iran Alloy Steel Co., (2005), 978.

[20] M. H. Amin andN. Akbari, Proc. of Iranian Steel Symposium 83, Iran Alloy Steel Co., (2005), 988 .

[21] M. H. Amin, F. Golestanifard and F. Moztarzadah, Industrial Ceramics, 22(2002), 19.

[22] T. Taschler, Proc. ofTehranInternational Conference on Refractories,Iran(2004), 302.

[23] M. H. Amin, Industrial Ceramics, 25(2005), 27.

[24] M. H. Amin and F. Moztarzadah, Journal of Faculty of Engineering   (UniversityofTabriz),Iran, 29(2004), 1.

[25] M. H. Amin, F. A. Hessari and M. Solati, Industrial Ceramics, 23(2003), 205.

[26] J. Madias, E. Brandaleze, M. Bentancour, R. Topolevsky and S. Camelli, Proc. of Conf. ‘UNITECR '01’, Unified Int. Tech. Conf. on Refractories.7th Biennial Worldwide Congress, Vol. 1, Cancun, (2001), 475.

[27] B. Sjodin, Eldfasta Material, Technical Compendium, MEFOS, (1971).

[28] Z. B. Alfassi, Z. Boger and Y. Ronen, Statistical Treatment of Analytical Data, Blackwell publishing, CRC press, (2005).

[29] W. S. Resende et al., Journal of the European Ceramic Society, 20(2000), 1419.