Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process

WU Sheng-li; SU Bo; QI Yuan-hong; LI Yuan; DU Bin-bin

doi:10.13374/j.issn2095-9389.2018.03.008

Volume 40 Issue 3

Mar. 2018

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WU Sheng-li, SU Bo, QI Yuan-hong, LI Yuan, DU Bin-bin. Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process[J]. Chinese Journal of Engineering, 2018, 40(3): 321-329. doi: 10.13374/j.issn2095-9389.2018.03.008

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WU Sheng-li, SU Bo, QI Yuan-hong, LI Yuan, DU Bin-bin. Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process[J]. Chinese Journal of Engineering, 2018, 40(3): 321-329. doi: 10.13374/j.issn2095-9389.2018.03.008

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Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process

doi: 10.13374/j.issn2095-9389.2018.03.008

WU Sheng-li¹,
SU Bo^{1,2
,
,},
QI Yuan-hong²,
LI Yuan¹,
DU Bin-bin¹

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2) State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China

Received Date: 2017-07-30

Abstract

Abstract

Sinter ore is one of the main materials of blast furnaces in China, and the productivity of the blast furnace and the economic and technical indicators of the ironmaking process are directly influenced by sinter yield and quality. Therefore, the ore-blending process should be optimized based on the high-temperature characteristics of iron ore to improve the sinter yield and quality and the energy efficiency of the ironmaking process. The liquid phase fluidity of iron ore is a vital characteristic of high-temperature sintering, since a suitable liquid phase fluidity of blended ores produces a sintered body with a stronger bonding strength. In this paper, by simulating the contact state of the iron ore particles and the calcareous flux particles in the actual sintering adhering fines, the FactSage thermodynamic calculation and the visible micro-sintering tests were conducted to study the liquid phase fluidity indexes of different iron ores and the major melt formation characteristic factors that influenced the liquid phase fluidity of iron ore under fixed CaO ratio conditions. The results show that the rule of liquid phase fluidity of iron ores under a fixed CaO ratio is different from the rule of liquid phase fluidity of iron ores with fixed alkalinity. According to the fitting relationship between the calculation results by Factsage software and the testing results of liquid phase fluidity index of the 9 kinds of iron ores, the formed melt content of iron ore is the most important melt formation characteristic factor that affects liquid phase fluidity. The formed melt content and the liquid phase fluidity index are directly related, and the coordination mechanism of liquid phase fluidity of iron ore is based on the principle of linear superposition of the formed melt content. Furthermore, the content of gangue minerals affects the liquid phase fluidity of iron ore to some extent. The liquid fluidity index decreases greatly with increased SiO₂ content, leading to lower formed melt content, while the liquid fluidity index slightly increases with increased Al₂O₃ content.
- iron ore sintering,
- adhering fines,
- liquid phase fluidity,
- thermodynamic calculation,
- melt formation characteristics

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References(12)

References

[4]	Xiao Z X, Chen L K, Yang Y D, et al. Effect of coarse-grain and low-grade iron ores on sinter properties. ISIJ Int, 2017, 57(5):795
[5]	Sinha M, Nistala S H, Chandra S, et al. Correlating mechanical properties of sinter phases with their chemistry and its effect on sinter quality. Ironmaking Steelmaking, 2017, 44(2):100
[7]	Oliveira D, Wu S L, Dai Y M, et al. Sintering properties and optimal blending schemes of iron ores. J Iron Steel Res Int, 2012, 19(6):1
[9]	Wu S L, Zhang G L, Chen S G, et al. Influencing factors and effects of assimilation characteristic of iron ores in sintering process. ISIJ Int, 2014, 54(3):582
[10]	Lü X W, Bai C G, Deng Q Y, et al. Behavior of liquid phase formation during iron ores sintering. ISIJ Int, 2011, 51(5):722
[11]	Peng J, Zhang L, Liu L X, et al. Relationship between liquid fluidity of iron ore and generated liquid content during sintering. Metall Mater Trans B, 2017, 48(1):538
[12]	Okazaki J, Higuchi K, Hosotani Y, et al. Influence of iron ore characteristics on penetrating behavior of melt into ore layer. ISIJ Int, 2003, 43(9):1384
[14]	Li H G, Zhang J L, Pei Y D, et al. Melting characteristics of iron ore fine during sintering process. J Iron Steel Res Int, 2011, 18(5):11
[15]	Liu D M, Loo C E, Pinson D, et al. Understanding coalescence in iron ore sintering using two bench-scale techniques. ISIJ Int, 2014, 54(10):2179
[16]	Sinha M, Nistala S H, Chandra S, et al. Thermodynamic study of evolution of sinter phases at different alumina level. Ironmaking Steelmaking, 2017, 44(2):92
[17]	Scarlett N V Y, Madsen I C, Pownceby M I, et al. In situ X-ray diffraction analysis of iron ore sinter phases. J Appl Cryst, 2004, 37(3):362
[18]	Sukenaga S, Gonda Y, Yoshimura S, et al. Viscosity measurement of calcium ferrite based slags during structural relaxation process. ISIJ Int, 2010, 50(2):195