固体碳还原熔渣中FeO反应的动力学研究

Kinetic Study on Reduction of FeO in Molten Slag with SolidCarbon

在１３８２～１５３５℃，通过测定渣中ＦｅＯ浓度随时间的变化关系，确定了固体碳还原熔融ＦｅＯ－ＣａＯ－ＳｉＯ２－Ａｌ２Ｏ３渣系中ＦｅＯ的反应速度．得出该反应为一级反应，在不同的温度范围内有不同的表观活化能和经验速度表达式．研究表明，在１３８２～１４５５℃，界面化学反应为固体碳还原熔渣中ＦｅＯ反应速度的限制环节；而在１４５５～１５３５℃，渣中ＦｅＯ的对流扩散为其限制步骤．此外，还在１５１０℃估算了渣中ＦｅＯ对流扩散的有效边界层厚度及其与转速的对应关系．

The reduction rate of FeO in molten slag of FeO-CaO-SiO2-Al2O3 with solid carbon has beendetermined at 1382～1535℃. It is of an apparent first-order reaction in the whole concentration range, andempirical equation and the apparent activation energy both have different expressions at different temperatureranges. Experiment results show that in the reduction of FeO in molten slag the interface reaction is a ratecontrolling factor at 1382～1455℃, while the convective diffusion of FeO is another rate-controlling factor at1455～1535℃. In addition,the thickness (δ) of the effective boundary layer of the convective diffusion ofFeO in slag has been estimated,as well as the relationship between & and the stirring speed.