Effect of Thermodynamic Melt Formation Characteristics on Liquid Phase Fluidity of Iron Ore in the Sintering Process

Shengli Wu,Bo Su,Weili Zhang,Heping Li

doi:10.3390/met9040404

Abstract

The liquid phase fluidity of iron ore is a vital index of fundamental sintering characteristics. In this paper, FactSage software and a visible microsintering test device were used to research the influence of the thermodynamic melt characteristics on the liquid phase fluidity under fixed CaO content conditions. The results show that the laws governing liquid phase fluidity of iron ore are significantly different with a fixed alkalinity and fixed CaO content of the sample. The liquid phase content at the sintering temperature is the most important thermodynamic melt formation characteristic affecting the liquid phase fluidity. In addition to the liquid phase content, other minerals also have a greater impact on liquid phase fluidity. Decreasing the viscosity of the liquid phase improves the liquid phase fluidity of the iron ore, and the effect of the SiO2 content of the iron ore on the mixed phase viscosity is greater than that of the Al2O3 content.

Highlights

Sinter is the main raw material for blast furnace ironmaking in China, and the quality of the sinter directly affects the stable operation of blast furnace ironmaking [1] and the economic and technical indexes [2,3]
A fixed mass content were measured by the visible microsintering test device respectively
Theare theoretical generation of liquid phase (TG), thecarried mass of liquid phase during results of the four parallel tests on Because the standard deviation sintering and the viscosity of liquid phase and mixed phase in the sintering of different iron ore samples is small the datacalculated of once test in the figure are represent its own with

Summary

Introduction

Sinter is the main raw material for blast furnace ironmaking in China, and the quality of the sinter directly affects the stable operation of blast furnace ironmaking [1] and the economic and technical indexes [2,3]. The melt formation capacity of the adhesive powder and the bonding effect between each component have vital effects on the sinter strength. Wu et al [4] first proposed the concept of liquid phase fluidity, which is a very important index of the fundamental sintering characteristics of iron ore. The fluidity of the liquid phase reflects the effective bonding range in the bonding phase. A suitable liquid phase fluidity could ensure a solid-liquid contact area, which can result in sufficient bonding strength. The liquid phase fluidity of iron ore is very important for optimizing ore matching [4,5,6,7]

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Results

Discussion

Conclusion