高铝铁矿石球团在预还原过程中的热力学行为

Thermodynamic behavior of high-aluminium iron ore pellets during pre-reduction process

应用物质吉布斯自由能函数法计算高铝铁矿石球团在预还原过程中所发生反应的ΔG,明确球团中物相在该过程中的热力学行为.热力学计算、分析结果表明:还原阶段产生的FeO最易与Al2O3反应生成FeO·Al2O3,其次与SiO2反应生成2FeO·SiO2,最后与SiO2反应生成FeO·SiO2·Al2O3置换2FeO·SiO2和FeO·SiO2中SiO2生成FeO·Al2O3的反应较之SiO2置换FeO·Al2O3中Al2O3的反应要容易得多.FeO.SiO2的还原反应趋势要强于FeO·Al2O3及2FeO.SiO2.

ΔG of the reactions for the high aluminium iron ore pellets during the pre-reduction was calculated through the material Gibbs free energy function to determine the thermodynamic behavior of the phases in the pellets.The results showed that FeO generated during the reduction stage is most likely to react with Al2O3 to generate FeO · Al2O3,then it is likely to react with SiO2 to generate 2FeO · SiO2,last it is likely to react with SiO2 to generate FeO · SiO2.Moreover,the reaction of Al2O3 to replace SiO2 in 2FeO · SiO2 and FeO · SiO2 to generate FeO · Al2O3 is much easier than that of SiO2 to replace Al2O3 in FeO · Al2O3.And the reaction trend of the reduction of FeO · SiO2 is stronger than that of FeO · Al2O3 and 2FeO · SiO2.