Blast furnace ironmaking process with super high TiO<sub>2</sub> in the slag: Density and surface tension of the slag

Zhengde Pang; Yuyang Jiang; Jiawei Ling; Xuewei Lü; Zhiming Yan

doi:10.1007/s12613-021-2262-x

Volume 29 Issue 6

Jun. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(6): 1170-1178

Zhengde Pang, Yuyang Jiang, Jiawei Ling, Xuewei Lü, and Zhiming Yan, Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1170-1178. https://doi.org/10.1007/s12613-021-2262-x

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Zhengde Pang, Yuyang Jiang, Jiawei Ling, Xuewei Lü, and Zhiming Yan, Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1170-1178. https://doi.org/10.1007/s12613-021-2262-x

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Research Article

Blast furnace ironmaking process with super high TiO₂ in the slag: Density and surface tension of the slag

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Corresponding authors:
Xuewei Lü E-mail: lvxuewei@cqu.edu.cn

Zhiming Yan E-mail: zhiming.yan@warwick.ac.uk
Received: 22 November 2020; Revised: 24 January 2021; Accepted: 26 January 2021; Available online: 2 February 2021

Abstract

Abstract

Aiming at the process of smelting ultra-high (>80%) or even full vanadium titanomagnetite in blast furnace, we are conducting a series of works on physics character of high TiO₂ bearing blast furnace slag (BFS) for slag optimization. This work discussed the density and surface tension of high TiO₂ bearing BFS using the Archimedean principle and the maximum bubble pressure method, respectively. The influence of TiO₂ content and the MgO/CaO mass ratio on the density and surface tension of CaO–SiO₂–TiO₂–MgO–Al₂O₃ slags were investigated. Results indicated that the density of slags decreased with the TiO₂ content increasing from 20wt% to 30wt%, but it increased slightly with the MgO/CaO mass ratio increasing from 0.32 to 0.73. In view of silicate network structure, the density and the degree of polymerization (DOP) of network structure have a consistent trend. The addition of TiO₂ reduced (Q³)²/(Q²) ratio (Q² and Q³ represent structural unit with bridge oxygen number of 2 and 3, respectively) and then decreased DOP, which led to the decrease of slag density. The surface tension of CaO–SiO₂–TiO₂–MgO–Al₂O₃ slags decreased dramatically with the TiO₂ content increasing from 20wt% to 30wt%. Conversely, it increased with the MgO/CaO mass ratio increasing from 0.32 to 0.73. Furthermore, the iso-surface tension lines were obtained under 1723 K using the Tanaka developed model in view of Butler formula. It may be useful for slag optimization of ultra-high proportion (>80%) or even full vanadium titanomagnetite under BF smelting.
- vanadium titanomagnetite;
- density;
- surface tension;
- iso-surface tension lines

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[1]	M. Hino, T. Nagasaka, A. Katsumata, K.I. Higuchi, K. Yamaguchi, and N. Kon-No, Simulation of primary-slag melting behavior in the cohesive zone of a blast furnace, considering the effect of Al₂O₃, Fe_tO, and basicity in the sinter ore, Metall. Mater. Trans. B, 30(1999), No. 4, p. 671. doi: 10.1007/s11663-999-0028-3
[2]	N. Siddiqi, B. Bhoi, R.K. Paramguru, V. Sahajwalla, and O. Ostrovski, Slag-graphite wettability and reaction kinetics Part 1. Kinetics and mechanism of molten FeO reduction reaction, Ironmaking Steelmaking, 27(2000), No. 5, p. 367. doi: 10.1179/030192300677679
[3]	M. Wegener, L. Muhmood, S. Sun, and A.V. Deev, Surface tension measurements of calcia−alumina slags: A comparison of dynamic methods, Metall. Mater. Trans. B, 46(2015), No. 1, p. 316. doi: 10.1007/s11663-014-0174-0
[4]	K. Ito and R.J. Fruehan, Study on the foaming of CaO−SiO₂−FeO slags: Part I. Foaming parameters and experimental results, Metall. Trans. B, 20(1989), No. 4, p. 509. doi: 10.1007/BF02654600
[5]	K. Ito and R.J. Fruehan, Study on the foaming of CaO−SiO₂−FeO slags: Part II. Dimensional analysis and foaming in iron and steelmaking processes, Metall. Trans. B, 20(1989), No. 4, p. 515. doi: 10.1007/BF02654601
[6]	H.L. George, R.J. Longbottom, S.J. Chew, and B.J. Monaghan, Flow of molten slag through a coke packed bed, ISIJ Int., 54(2014), No. 4, p. 820. doi: 10.2355/isijinternational.54.820
[7]	D.D. Geleta, M.I.H. Siddiqui, and J. Lee, Characterization of slag flow in fixed packed bed of coke particles, Metall. Mater. Trans. B, 51(2020), No. 1, p. 102. doi: 10.1007/s11663-019-01750-6
[8]	L. Zhang, L.N. Zhang, M.Y. Wang, G.Q. Li, and Z.T. Sui, Recovery of titanium compounds from molten Ti-bearing blast furnace slag under the dynamic oxidation condition, Miner. Eng., 20(2007), No. 7, p. 684. doi: 10.1016/j.mineng.2007.01.003
[9]	D.S. Chen, B. Song, L.N. Wang, T. Qi, Y. Wang, and W.J. Wang, Solid state reduction of Panzhihua titanomagnetite concentrates with pulverized coal, Miner. Eng., 24(2011), No. 8, p. 864. doi: 10.1016/j.mineng.2011.03.018
[10]	F. Valighazvini, F. Rashchi, and R. Khayyam Nekouei, Recovery of titanium from blast furnace slag, Ind. Eng. Chem. Res., 52(2013), No. 4, p. 1723. doi: 10.1021/ie301837m
[11]	P. Liu, L.B. Zhang, B.G. Liu, G.J. He, J.H. Peng, and M.Y. Huang, Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furnace slag, Int. J. Miner. Metall. Mater., 28(2021), No. 1, p. 88. doi: 10.1007/s12613-020-1985-4
[12]	L.Z. Gao, T.X. Ma, M.J. Hu, Z.M. Yan, X.W. Lü, and M.L. Hu, Effect of titanium content on the precipitation behavior of carbon-saturated molten pig iron, Int. J. Miner. Metall. Mater., 26(2019), No. 4, p. 483. doi: 10.1007/s12613-019-1755-3
[13]	J.Y. Xiang, Q.Y. Huang, X. Lv, and C.G. Bai, Effect of mechanical activation treatment on the recovery of vanadium from converter slag, Metall. Mater. Trans. B, 48(2017), No. 5, p. 2759. doi: 10.1007/s11663-017-1033-6
[14]	G.Q. Ma and M. Cheng, Technological study of titanium slag production from titanium-bearing blast furnace slag, Adv. Mater. Res., 962-965(2014), p. 793. doi: 10.4028/www.scientific.net/AMR.962-965.793
[15]	T.Q. Jiang, H.G. Dong, Y.F. Guo, G.H. Li, and Y.B. Yang, Study on leaching Ti from Ti bearing blast furnace slag by sulphuric acid, Miner. Process. Extr. Metall., 119(2010), No. 1, p. 33. doi: 10.1179/037195509X12585446038807
[16]	Z.D. Pang, X.W. Lv, J.W. Ling, Y.Y. Jiang, Z.M. Yan, and J. Dang, Blast furnace ironmaking process with super high TiO₂ in the slag: High-temperature structure of the slag, Metall. Mater. Trans. B, 51(2020), No. 5, p. 2348. doi: 10.1007/s11663-020-01929-2
[17]	Z.M. Yan, X.W. Lv, Z.D. Pang, X.M. Lv, and C.G. Bai, Transition of blast furnace slag from silicate based to aluminate based: Density and surface tension, Metall. Mater. Trans. B, 49(2018), No. 3, p. 1322. doi: 10.1007/s11663-018-1242-7
[18]	Y.H. Liu, X.W. Lv, C.G. Bai, and B. Yu, Surface tension of the molten blast furnace slag bearing TiO₂: Measurement and evaluation, ISIJ Int., 54(2014), No. 10, p. 2154. doi: 10.2355/isijinternational.54.2154
[19]	V.B. Fainerman, R. Miller, and P. Joos, The measurement of dynamic surface tension by the maximum bubble pressure method, Colloid Polym. Sci., 272(1994), No. 6, p. 731. doi: 10.1007/BF00659287
[20]	N. Ono, T. Kaneko, S. Nishiguchi, and M. Shoji, Measurement of temperature dependence of surface tension of alcohol aqueous solutions by maximum bubble pressure method, J. Therm. Sci. Technol., 4(2009), No. 2, p. 284. doi: 10.1299/jtst.4.284
[21]	H.A. Friedrichs, L.W. Ronkow, P. Vermot, and S.A. Bliznjukow, New method for simultaneous measurement of viscosity, density and surface tension of metallic melts at high temperatures, Steel Res., 66(1995), No. 12, p. 509. doi: 10.1002/srin.199501163
[22]	G. Liu, J.M. Toguri, and N.M. Stubina, Surface tension and density of the molten LaCl₃–NaCl binary system, Can. J. Chem., 65(1987), No. 12, p. 2779. doi: 10.1139/v87-462
[23]	T. Fujisawa, T. Utigard, and J.M. Toguri, Surface tension and density of the molten PbCl₂–KCl–NaCl ternary system, Can. J. Chem., 63(1985), No. 5, p. 1132. doi: 10.1139/v85-192
[24]	A. Pamies, C. Garcia Cordovilla, and E. Louis, The measurement of surface tension of liquid aluminium by means of the maximum bubble pressure method: The effect of surface oxidation, Scripta Metall., 18(1984), No. 9, p. 869. doi: 10.1016/0036-9748(84)90251-5
[25]	O. Takeda, H. Iwamoto, R. Sakashita, C. Iseki, and H.M. Zhu, Development of maximum bubble pressure method for surface tension measurement of high viscosity molten silicate, Int. J. Thermophys., 38(2017), No. 7, art. No. 109.
[26]	F.A. Oliveira, A. Miller, and J. Madías, Surface tension, densities and viscosities of some CaO−Al₂O₃ slags, Rev. Metal., 35(1999), No. 2, p. 91. doi: 10.3989/revmetalm.1999.v35.i2.611
[27]	P. Vadász, M. Havlík, and V. Danêk, Density and surface tension of calcium–ferritic slags I. The systems Cao–FeO–Fe₂O₃–SiO₂ and CaO–FeO–Fe₂O₃–Al₂O₃, Can. Metall. Q., 39(2000), No. 2, p. 143. doi: 10.1179/cmq.2000.39.2.143
[28]	K.C. Mills, Slag Atlas, 2nd ed., Verlag Stahleisen, Germany, 1995.
[29]	S. Sukenaga, S. Haruki, Y. Nomoto, N. Saito, and K. Nakashima, Density and surface tension of CaO–SiO₂–Al₂O₃–R2O (R=Li, Na, K) melts, ISIJ Int., 51(2011), No. 8, p. 1285. doi: 10.2355/isijinternational.51.1285
[30]	A.I. Bochorishvili and S.B. Yakobashvili, Effect of metal oxide on the surface tension of lime–alumina slags, Svar. Proiz., 10(1968), No. 1, p. 13.
[31]	S. Sukenaga, T. Higo, H. Shibata, N. Saito, and K. Nakashima, Effect of CaO/SiO₂ ratio on surface tension of CaO–SiO₂–Al₂O₃–MgO melts, ISIJ Int., 55(2015), No. 6, p. 1299. doi: 10.2355/isijinternational.55.1299
[32]	W.D. Kingery, Surface tension of some liquid oxides and their temperature coefficients, J. Am. Ceram. Soc., 42(1959), No. 1, p. 6. doi: 10.1111/j.1151-2916.1959.tb09134.x
[33]	J.A.V. Butler, The thermodynamics of the surfaces of solutions, Proc. R. Soc. London A, 135(1932), No. 827, p. 348. doi: 10.1098/rspa.1932.0040
[34]	B.O. Mysen, F.J Ryerson, and D. Virgo, The influence of TiO₂ on the structure and derivative properties of silicate melts, Am Miner., 65(1980), No. 11-1, p. 1150.
[35]	B.O. Mysen, D. Virgo, C.M. Scarfe, and D.J. Cronin, Relations between the anionic structure and viscosity of silicate melts; a Raman spectroscopic study, Am. Mineral., 65(1980), No. 7-8, p. 690.
[36]	B.O. Mysen, D. Virgo, and I. Kushiro, The structural role of aluminium in silicate melts—A Raman spectroscopic study at 1 atmosphere, Am. Mineral., 66(1981), No. 7, p. 678.
[37]	B.O. Mysen, D. Virgo, and F.A. Seifert, The structure of silicate melts: Implications for chemical and physical properties of natural magma, Rev. Geophys. Space Phys., 20(1982), No. 3, p. 353. doi: 10.1029/RG020i003p00353
[38]	B.O. Mysen, L.W. Finger, D. Virgo, and F.A. Seifert, Curve-fitting of Raman spectra of silicate glasses, Am. Mineral., 67(1982), No. 7, p. 686.
[39]	K.C. Mills, M. Hayashi, L.J. Wang, and T. Watanabe, The structure and properties of silicate slags, [in] Treatise on Process Metallurgy, Elsevier, Amsterdam, 2014, p. 149.
[40]	K.C. Mills, The estimation of slag properties, [in] Southern African Pyrometallurgy 2011 International Conference, Southern African, 2011.
[41]	K.C. Mills, L. Yuan, and R.T. Jones, Estimating the physical properties of slags, J. South Afr. Inst. Min. Metall., 111(2011), p. 649.
[42]	T. Tanaka, K. Hack, T. Iida, and S. Hara, Application of thermodynamic databases to the evaluation of surface tensions of molten alloys, salt mixtures and oxide mixtures, Int. J. Mater. Res., 87(1996), No. 5, p. 380. doi: 10.1515/ijmr-1996-870509
[43]	T. Tanaka, T. Kitamura, and I.A. Back, Evaluation of surface tension of molten ionic mixtures, ISIJ Int., 46(2006), No. 3, p. 400. doi: 10.2355/isijinternational.46.400
[44]	M. Nakamoto, A. Kiyose, T. Tanaka, L. Holappa, and M. Hämäläinen, Evaluation of the surface tension of ternary silicate melts containing Al₂O₃, CaO, FeO, MgO or MnO, ISIJ Int., 47(2007), No. 1, p. 38. doi: 10.2355/isijinternational.47.38
[45]	M. Nakamoto, M. Hanao, T. Tanaka, M. Kawamoto, L. Holappa, and M. Hämäläinen, Estimation of surface tension of molten silicates using neural network computation, ISIJ Int., 47(2007), No. 8, p. 1075. doi: 10.2355/isijinternational.47.1075
[46]	M. Hanao, T. Tanaka, M. Kawamoto, and K. Takatani, Evaluation of surface tension of molten slag in multi-component systems, ISIJ Int., 47(2007), No. 7, p. 935. doi: 10.2355/isijinternational.47.935
[47]	R.D. Shannon, Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides, Acta Crystallogr. Sect. A, 32(1976), No. 5, p. 751. doi: 10.1107/S0567739476001551
[48]	I. Sohn and D.J. Min, A review of the relationship between viscosity and the structure of calcium-silicate-based slags in ironmaking, Steel Res. Int., 83(2012), No. 7, p. 611. doi: 10.1002/srin.201200040
[49]	R. Knoche, D.B. Dingwell, and S.L. Webb, Melt densities for leucogranites and granitic pegmatites: Partial molar volumes for SiO₂, Al₂O₃, Na₂O, K₂O, Li₂O, Rb₂O, Cs₂O, MgO, CaO, SrO, BaO, B₂O₃, P₂O₅, F₂O₋₁, TiO₂, Nb₂O₅, Ta₂O₅, and WO₃, Geochim. Cosmochim. Acta, 59(1995), No. 22, p. 4645. doi: 10.1016/0016-7037(95)00328-2