Abstract
The sintering process is significantly important for the ironmaking in China because of the large amount of sinter consumed. Al2O3 is an important element determining the quality and quantity of sinter. However, different conclusions have been made regarding the effects of Al2O3 on the amount and fluidity of the liquid phase formed in the sinter phase. Therefore, it is necessary to examine the effects of Al2O3 content on the amount and fluidity of the liquid phase. The present work investigated the effects of different Al2O3 contents of iron ore fines on the liquid phase formation, mineral composition, and consolidation strength. The results showed that a small amount of Al2O3 increased the amount of calcium ferrite, making the liquid phase formation easier. As the Al2O3 content in iron ore fines increased, the liquidity index decreased continuously, while the fluidity and the consolidation strength of the sintered body were directly related to the content squared. The quality of the sinter is optimal when the Al2O3 content of the iron ore fines is about 2 wt % (the SiO2 content is 4 wt %).
Highlights
The blast furnace still plays a dominant position in the ironmaking process, and will for the foreseeable future [1]
It is believed that SFCA cannot be produced in the absence of Al2 O3, and Al2 O3 is beneficial to the stable presence of calcium ferrite in the liquid phase [8,9]
The results revealed that the formation of calcium ferrite containing aluminum (CFA) was promoted by both granular Al2 O3 wrapped in Fe2 O3 and aluminum dissolved in the Fe2 O3 solid solution [11]
Summary
The blast furnace still plays a dominant position in the ironmaking process, and will for the foreseeable future [1]. The presented research focuses on the formation of calcium ferrite (CF), CFA, and SFCA in the presence of Al2 O3 and its effects on the assimilation and viscosity behaviors. Kasai et al, studied the effect of iron ore properties on the flow of melt formed in the sintering process and found that an increase of the Al2 O3 content in ores led to decreased fluidity of the melt formed and increased melt-down temperature [14]. Dong et al, indicated that the high alumina content was bad for the melt formation and fluidity properties of iron ores, and had an adverse effect on sinter quality [16]. It is necessary to investigate the effects of Al2 O3 content on the amount and fluidity of the liquid phase and reveal the influence mechanism of Al2 O3 on sinter quality
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