Abstract
Desulfurizing ability of the CaO-CaCl2-CaF2 slags saturated with CaO has been investigated from the viewpoint of the sulfide capacity and CaO solubility. The CaO-CaCl2-CaF2 slags containing small amounts of Cu2O and CaS were inserted in a CaO crucible with metallic copper. The CaO crucible was sealed in a nickel holder to prevent the evaporation of CaCl2, then heated up and kept at temperatures from 1573 K (1300 °C) to 1673 K (1400 °C) for 24 hours, which enabled the system inside the CaO crucible to reach the equilibrium. As expected, the sulfide capacity derived from the data obtained as well as CaO solubility of the slag increase with an increase in temperature at a constant ratio of CaCl2/CaF2. The solubility of CaO increases by the replacement of CaF2 with CaCl2, whereas the sulfide capacity slightly decreases and the activity coefficient of CaS (γ CaS) increases. This suggests that CaF2 has stronger interaction with CaS than CaCl2. The sulfur distribution ratio between carbon-saturated iron melts and the CaO-CaCl2 slag has been calculated to be about 10 000 at 1573 K (1300 °C) using the sulfide capacity obtained, which value is still large enough even with the replacement of CaF2 by CaCl2.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Notes
LECO is a trademark of Leco Corporation, St. Joseph, MI.
References
K. Takahashi, K. Utagawa, H. Shibata, S. Kitamura, N. Kikuchi, and Y. Kishimoto: ISIJ Int., 2012, vol. 52, pp. 10-17.
J. C. Niedringhaus and R. J. Fruehan: Metall. Trans. B, 1988, vol. 19B, pp. 261-68.
Y. Taniguchi, L. Wang, N. Sano, and S. Seetharaman: Metall. Trans. B, 2012, vol. 43B, pp. 477-84.
Y. Taniguchi, N. Sano, and S. Seetharaman: ISIJ Int., 2009, vol. 49, pp. 156-63.
K. Susaki, M. Maeda, and N. Sano: Metall. Trans. B, 1990, vol. 21B, pp. 121-29.
M. Uo, E. Sakurai, F. Tsukihashi, and N. Sano: Steel Res., 1989, vol. 60, pp. 496-502.
T. Hamano, M. Horibe, and K. Ito: ISIJ Int., 2004, vol. 44, pp. 263-67.
T. Sakai and M. Maeda: Tetsu-to-Hagané, 1990, vol. 76, pp. 64-69.
K. Sano and H. Sakao: J. Jpn. Inst. Met., 1955, vol. 19, pp. 655-59.
M. A. El-Naggar and N. A. D. Parlee: Metall. Trans. B, 1970, vol. 1B, pp. 2975-77.
D. A. Wenz, I. Johnson, and R. D. Wolson: J. Chem. Eng. Data, 1969, vol. 14, pp. 250-52.
N. Sano, F. Tsukihashi, and A. Tagaya: ISIJ Int., 1991, vol. 31, pp. 1345-47.
R. Ries and K. Schwerdtfeger: Archiv Eisenhüttenwesen, 1980, vol. 51, pp. 123-129.
E. T. Turkdogan: Physical Chemistry of High Temperature Technology, Academic Press, New York, 1980, pp. 7.
M. Temkin: Acta Physicochim URSS, 1945, vol. 20, pp. 411-20.
The 19 th Committee on Steelmaking, the Japan Society for the Promotion of Science: Steelmaking Data Source book, Gordon and Breach Science Publishers, New York, 1988, pp. 39.
M. W. Chase, C. A. Davies, J. R. Downey, D. J. Frurip, R. A. McDonald, and A. N. Syverud: J. Phys. Chem. Ref. Data, 1985, vol. 14, Suppl. 1, pp. 626.
Author information
Authors and Affiliations
Corresponding author
Additional information
Manuscript submitted July 19, 2016.
Rights and permissions
About this article
Cite this article
Liu, J., Kobayashi, Y. Desulfurizing Ability of the CaOsatd.-CaCl2-CaF2 Slags. Metall Mater Trans B 48, 1108–1113 (2017). https://doi.org/10.1007/s11663-016-0890-8
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11663-016-0890-8