Abstract
The desulfurization ability of refining slag with relative lower basicity (B) and Al2O3 content (B = 3.5–5.0; 20wt%–25wt% Al2O3) was studied. Firstly, the component activities and sulfide capacity (C S) of the slag were calculated. Then slag-metal equilibrium experiments were carried out to measure the equilibrium sulfur distribution (L S). Based on the laboratorial experiments, slag composition was optimized for a better desulfurization ability, which was verified by industrial trials in a steel plant. The obtained results indicated that an MgO-saturated CaO-Al2O3-SiO2-MgO system with the basicity of about 3.5–5.0 and the Al2O3 content in the range of 20wt%–25wt% has high activity of CaO (a CaO), with no deterioration of C S compared with conventional desulfurization slag. The measured L S between high-strength low-alloyed (HSLA) steel and slag with a basicity of about 3.5 and an Al2O3 content of about 20wt% and between HSLA steel and slag with a basicity of about 5.0 and an Al2O3 content of about 25wt% is 350 and 275, respectively. The new slag with a basicity of about 3.5–5.0 and an Al2O3 content of about 20wt% has strong desulfurization ability. In particular, the key for high-efficiency desulfurization is to keep oxygen potential in the reaction system as low as possible, which was also verified by industrial trials.
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References
X.H. Wang, Discussion on proper refining process for plate, [in] Proceedings of National Steelmaking-Continuous Casting Technology Meeting, Hangzhou, 2008, p. 14.
E. Keskinkilic, A. Geveci, and Y.A. Topkaya, Desulphurization characteristics of ladle furnace slags of a low sulphur steel, Can. Metall. Q., 46(2007), No. 4, p. 391.
T. Schambron, A.W. Phillips, D.M. O’Brien, J. Burg, E.V. Pereloma, C.C. Killmore, and J.A. Williams, Thermomechanical processing of pipeline steels with a reduced Mn content, ISIJ Int., 49(2009), No. 2, p. 284.
D.J. Sosinsky and I.D. Sommerville, The composition and temperature dependence of the sulfide capacity of metallurgical slags, Metall. Trans. B, 17(1986), No. 2, p. 331.
R.W. Young, J.A. Duffy, G.J. Hassall, and Z. Xu, Use of the optical basicity concept for determining phosphorus and sulphur slag-metal partitions, Ironmaking Steelmaking, 19(1992), No. 3, p. 201.
Y. Taniguchi, N. Sano, and S. Seetharaman, Sulphide capacities of CaO-Al2O3-SiO2-MgO-MnO slags in the temperature range 1673–1773 K, ISIJ Int., 49(2009), No. 2, p. 156.
M.M. Nzotta, S.C. Du, and S. Seetharaman, A study of the sulfide capacities of iron-oxide containing slags, Metall. Mater. Trans. B, 30(1999), No. 5, p. 909.
C.B. Shi, X.M. Yang, J.S. Jiao, C. Li, and H.J. Guo, A sulphide capacity prediction model of CaO-SiO2-MgO-Al2O3 ironmaking slags based on the ion and molecule coexistence theory, ISIJ Int., 50(2010), No. 10, p. 1362.
Y.F. Chen and Y. Wang, Study on distribution ratio of sulphur between CaO-SiO2-MgO-Al2O3 molten slag and liquid steel, [in] The 6th CSM Annual Meeting Proceedings, Chengdu, 2007, p. 20.
S. Ban-Ya, M. Hobo, T. Kaji, T. Itoh, and M. Hino, Sulphide capacity and sulphur solubility in CaO-Al2O3 and CaO-Al2O3-CaF2 slags, ISIJ Int., 44(2004), No. 11, p. 1810.
N. Hao, Study on the Production Process of Ultra-low Sulfur Steel and the Desulfurization Reaction during Secondary Refining [Dissertation], University of Science and Technology Beijing, Beijing, 2007, p. 25.
M. Andersson, M. Hallberg, L. Jonsson, and P. Jönsson, Slag-metal reactions during ladle treatment with focus on desulphurisation, Ironmaking Steelmaking, 29(2002), No. 3, p. 224.
Y. Ogura, Y. Kikuchi, T. Hasegawa, K. Matsuo, K. Taguchi, and M. Hanmyo, Development of secondary refining process and its application to production of clean steel, Tetsu-to-Hagane, 72(1986), No. 9, p. 1309.
N. Bannenberg and B. Nergmann, Combined decrease of sulphur, nitrogen, hydrogen and total oxygen in only one secondary steelmaking operation, [in]_Proceedings of the 6th International Iron and Steel Congress, Nagoya, 1990, p. 603.
W.J. Chen, J.S. Chen, J.Z. Zheng, and G. Tong, Production practice of ultra-low sulphur steel at Baosteel, [in] The 7th CSM Annual Meeting Proceedings, Beijing, 2009, p. 1142.
G.S. Zhu, H.B. Li, B.H. Li, X.H. Wang, J. Yang, and X.M. Kang, Formation mechanism and control of inclusions in X80 pipeline coils, [in] Proceedings of the 5th International Congress on the Science and Technology of Steelmaking, Dresden, 2012.
X.H. Wang, X.G. Li, Q. Li, F.X. Huang, H.B. Li, and J. Yang, Control of stringer shaped non-metallic inclusions of CaO-Al2O3 system in API X80 linepipe steel plates, Steel Res. Int., 85(2014), No. 2, p. 155.
Q. Li, X.H. Wang, H.B. Li, F.X. Huang, J. Yang, and W.J. Wang, Variation of non-metallic inclusions composition in X80 pipeline steel refined by high basicity slag, J. Iron Steel Res. Int., 18(2011), Suppl. 1, p. 563.
J.H. Son, I.H. Jung, S.M. Jung, H. Gaye, and H.G. Lee, Chemical reaction of glazed refractory with Al-deoxidized molten steel, ISIJ Int., 48(2008), No. 11, p. 1542.
X.H. Wang, M. Jiang, B. Chen, and H.B. Li, Study on formation of non-metallic inclusions with lower melting temperatures in extra low oxygen special steels, Sci. China Technol. Sci., 55(2012), No. 7, p.1863.
H.X. Yu, X.H. Wang, J. Zhang, H.B. Li, and W.J. Wang, Cleanliness of alloying structural steel, J. Iron Steel Res. Int., 18(2011), No. 12, p. 6.
S.L. Xu, L.S. Jin, Q. Wang, and F.Y. Meng, Improvement of ladle furnace desulfurizing technics, China Metall., 19(2009), No. 7, p. 28.
X.Z. Wang, H.Q. Liu, S.Z. Wang, S.G. Song, and Y.Q. Zhang, Process analysis of deep desulphurization and controlling nitrogen and inclusions of X70 pipeline steel, Iron Steel, 46(2011), No. 8, p. 25.
J. Li, G.P. Rong, X.L. Wang, C.L. Hu, and G.L. Wang, Experimental study of ladle furnace desulphurization with CaO-Al2O3-SiO2 based refining slag, Steelmaking, 29(2013), No. 1, p. 48.
D. Takahashi, M. Kamo, Y. Kurose, and H. Nomura, Deep steel desulphurisation technology in ladle furnace at KSC, Ironmaking Steelmaking, 30(2003), No. 2, p. 116.
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Yu, Hx., Wang, Xh., Wang, M. et al. Desulfurization ability of refining slag with medium basicity. Int J Miner Metall Mater 21, 1160–1166 (2014). https://doi.org/10.1007/s12613-014-1023-5
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DOI: https://doi.org/10.1007/s12613-014-1023-5