高铝褐铁矿直接还原过程中的热力学计算

Thermodynamic Calculation of High Alumina Limonite during the Process of Direct Reduction

摘要: 通过热力学计算，研究了高铝褐铁矿直接还原过程中的主要氧化物之间的反应热力学规律。计算结果表明：当反应温度为980 K、平衡气相中CO的体积分数为62%时，在直接还原过程中开始生成金属Fe。当体系温度大于1100 K时，反应产物生成的先后顺序为FeO•Al₂O₃，2FeO•SiO₂，FeO•SiO₂ 。由于直接还原过程中不可避免有FeO的产生，在相同CO体积分数和温度下各氧化物与FeO反应产物的反应活性顺序为FeO•SiO₂>2FeO•SiO₂>FeO•Al₂O₃，这会直接影响高铝褐铁矿直接还原过程中铁的金属化率。

Abstract: The thermodynamics of high aluminum limonite during direct reduction was investigated by thermodynamic calculation. The results show that when the reaction temperature was 980 K and the volume fraction of CO was 62%, metal Fe starts generating. When the system temperature is over 1100 K, reaction products were according to following subsequence FeO•Al₂O₃，2FeO•SiO₂，FeO•SiO₂，FeO. Due to the inevitable producing of FeO in the process of direct reduction, the reactivity ranking of various reactants under the same volume fraction of CO and temperature is FeO•SiO₂>2FeO•SiO₂>FeO•Al₂O₃, which will affect the metallization rate of iron in the direct reduction process of high alumina limonite.