Calculation of MnO Activity in Aluminate Slags at Various Temperatures

Document Type: Research Paper


1 Ceramic Department, Materials and Energy Research Center (MERC), P.O. Box 14155-4777, Tehran, Iran.

2 Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran.

3 Research Center for Materials and Mining Industries Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran.


In this research, the activity of MnO, produced during steel making in aluminate-rich slags, was investigated. According to thermodynamic equations and mathematical calculation, a series of relations was obtained for evaluation of oxide activity using Masson’s theory. The obtained relations were solved according to Levenberg- Marquardt method and using Matlab software. The results were correlated with the experimental Data. To derive relations, it was assumed that the solution has ideal behavior and the polymeric chains are linear. Finally, a relation was derived for oxide activity calculation which can be used in a wide range of concentration. MnO activity was investigated at various temperatures, using the experimental data and the obtained relation. Furthermore, the relation between equilibrium constant (K) and temperature was obtained. By means of the results the viscosity of melt can also be forecasted.


[1] ASM Handbook, Properties and selection: irons,
steels, and high performance alloys, Vol. 1, 10th ed.,
Metals Park, OH 44073, (1990), 908.
[2] T. L. Shinoda, M. B. Zaghloul, Y. Kondo and R.
Tanaka: Trans. Iron Steel Inst. Jpn., 18(1998), 139.
[3] M. Karaminezhad, E. Kordzadeh and S. Ebrahimi:
Int. J. of ISSI, 2(2005), 31.
[4] S. Jaganathan et al.: Eng. Fail. Anal., 15(2008), 311.
[5] J. Laigo, F. Christien, R. Le Gall, F. Tancret and J.
Furtado: Mater. Charact., 59(2008), 1580.
[6] F. G. Imizcoz Caballero, P. Lopez, L. F. Alvarez
and C. Andres: Mater. Sci. Technol., 23(2007), 528.
[7] J. M. Gong, S. T. Tu and K. B. Yoon: Eng. Fail.
Anal., 6(1999), 143.
[8] M. W. Mucek: Mater. Perform., 9(1983), 25.
[9] L. H. De Almeida, A. F. Ribeiro and I. Le May:
Mater. Charact., 49(2002), 219.
[10] B. Piekarski: Mater. Charact., 47(2001), 181.
[11] R. L. Colwell and J. J. Hoffman: Proc. of
the NACE int. annual conf. corrosion 98, NACE
International, (1998), 423.
[12] E. A. Kenik, P. J. Maziasz, R. W. Swindeman, J.
Cervenka and D. May: Scripta Mater., 49(2003), 117.