Mathematical modelling and plant trial on slagging regime in a ladle furnace for high-efficiency desulphurization

Abstract

Intelligent iron/steel manufacturing has been drawing increasing attention in recent years. Slagging is of importance for clean steel production in the ladle furnace (LF) refining process. In this study, a calculation model of slag-making materials was established based on the actual LF refining conditions, the metallurgical mechanism model and the production data model of the sulphur distribution ratio. In order to test the slag-making model, the data of 50 heats from historical production were examined by using the model; as a result, 49 heats successfully reached the target sulphur content when the error of the lime weight is within the range of ±40 kg. Meanwhile, plant trials were carried out to validate the slag-making model; the results demonstrated that 45 out of 48 tested heats successfully reached the required level of desulphurization by adding slag-making materials at one time.

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References

Feng

et al. End temperature prediction of molten steel in LF based on CBR–BBN. Steel Res Int. 2016;87(1):79–86.

LF refining technology. Beijing: Metallurgical Industry Press; 2009.

Cao

Nastac

Mathematical modelling of slag–metal reactions and desulphurization behaviour in gas-stirred ladle based on the DPM-VOF coupled model. Ironmak Steelmak. 2020;47(8):873–881.

Zhang

et al. Effect of Al₂O₃ content on metallurgical characteristics of refining slag. Ironmak Steelmak. 2016;43(8):607–615.

Wang

Zhang

et al. Characteristics and metallurgical effects of medium basicity refining slag on low melting temperature inclusions. J Iron Steel Res Int. 2015;22(7):573–581.

Bruno

Wagner

Antônio

Efficiency of inclusion absorption by slags during secondary refining of steel. ISIJ Int. 2014;54(7):1584–1591.

Andersson

Jonsson

Hallberg

Optimisation of ladle slag composition by application of sulphide capacity model. Ironmak Steelmak. 2000;27(4):286–293.

Wang

et al. Desulfurization ability of refining slag with medium basicity. Int J Miner Metall Mater. 2014;21(12):1160–1166.

Berger

Pezzin

Grillo

et al. Analysis of the influence of adding CaF₂ and Na₂O to steel desulfurizing mixtures using computational thermodynamics. J Mater Res Technol. 2019;8(5):4651–4658.

10.

Conejo

Lara

Macias-Hernández

et al. Kinetic model of steel refining in a ladle furnace. Steel Res Int. 2007;78(2):141–150.

11.

Pei

Chen

et al. Experimental study on deep desulfurizer in LF process. J Iron Steel Res Int. 2012;19(4):17–21.

12.

Andersson

Hallberg

Jonsson

et al. Slag-metal reactions during ladle treatment with focus on desulphurisation. Ironmak Steelmak. 2002;29(3):224–232.

13.

Kim

Sohn

et al. The effect of MgO on the viscosity of the CaO-SiO₂-20wt%Al₂O₃-MgO slag system. Steel Res Int. 2010;81(4):261–264.

14.

Mostaghel

Chattopadhyay

Development of an artificial neural network to predict sulphide capacities of CaO-SiO₂-Al₂O₃-MgO slag system. ISIJ Int. 2017;57(1):114–122.

15.

Xin

Zhang

Lin

et al. Sulphide capacity prediction of CaO–SiO₂–MgO–Al₂O₃ slag system by using regularized extreme learning machine. Ironmak Steelmak. 2021;48(3):275–283.

16.

Dong

Zhu

Basic research of LF furnace feeding control model. Chin J Proc Eng. 2009;9(S1):384–389.

17.

Peng

Zhou

et al. Calculation of LF finishing slag composition on CSP production line and backstage running of the model at lianyuan Iron and steel corporation. J Wuhan Univ Sci Tech. 2007;30(2):117–120.

18.

Huang

Principle of ferrous metallurgy. 3rd ed . Beijing: Metallurgical Industry Press; 2010.

19.

Par

Lage

Viscosities of LF slags and their impact on ladle refining. ISIJ Int. 1997;37(5):484–491.

20.

Xin

Zhang

et al. Fluidity of vanadium-titanium BF slag. J Iron Steel Res. 2017;29(10):787–791.

21.

Fincham

Richardson

The behaviour of sulphur in silicate and aluminate melts. P Roy Soc A. 1954;223(1152):40–62.

22.

Wang

Ferrous metallurgy steelmaking. Beijing: Higher Education Press; 2007.

23.

Liang

Zhang

et al. Research on the slag-metal sulfur partition and the kinetics equation of desulfurization in LF refining process. Acta Metall Sin. 2001;37(10):1069–1072.

24.

Application and research of slag-stopping technology with sliding plate in the 150t converter in Tangshan iron and steel. Heilongjiang Metall. 2016;36(1):21–22.

25.

Sheng

Xie

Pan

Probability theory and mathematical statistics. Beijing: Higher Education Press; 2008.