Abstract:In order to have a better understanding of the basic characteristics at high temperature so as to guide the sintering ore blending and improve the quality of sinter, the high temperature sintering properties such as assimilability, liquid fluidity, bonding phase strength and calcium ferrite production for 10 kinds of iron ore powders including low-silicon ores were studied and measured by experiments. On this basis, the influence of chemical composition in iron ore powder on basic characteristics of sintering at high temperature was analyzed and discussed. The research shows that the higher the LOI value, the lower the assimilation temperature, but the over-high LOI value will reduce the liquid fluidity and the bonding phase strength. With the increase of Al2O3 mass fraction, assimilation temperature decreases, bonding phase strength and calcium ferrite production increase, and the liquid fluidity first increases and then decreases with the increase of Al2O3 mass fraction. The liquid fluidity index is higher when the Al2O3mass fraction is in the range of 1.0%-1.5%. The bonding phase strength and calcium ferrite production increase first and then decrease with the increase of SiO2 mass fraction. When the SiO2mass fraction is lower than 6.0%, the assimilation temperature decreases with the increase of SiO2mass fraction in iron ore powder. The study result has certain reference significance for exploring the influencing factors for basic characteristics of iron ore powder at high temperature.
杨双平, 于成刚, 何少红, 赵永喆, 杨尚琦, 刘海金. 铁矿粉化学成分对烧结高温基础特性的影响[J]. 中国冶金, 2023, 33(2): 47-54.
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