氢还原块状Fe_2O_3的动力学及分层现象

Kinetics and Stratification of Hydrogen Reduction of Block Hematite

通过EPMA、金相等分析手段,对块状Fe2O3在1073~1273 K的氢还原过程进行了研究.结果表明,氢还原块状Fe2O3的过程具有阶段性并具有明显的分层现象,并根据XRD及EPMA检测结果分析了中间产物层的形成机理.本实验条件下,反应过程处于气体内扩散与界面化学反应控速的阶段,反应的表观活化能为27.0±5.9 kJ/mol.

The hydrogen reduction process of block hematite in 1073-1273 K was studied by using EPMA and metallographic analysis. The results showed that there were a staged character and stratification in the hydrogen reduction process of block hematite. The mechanism of the staged character and stratification was discussed based on the results of XRD and EPMA. Under the experimental conditions in this work, the reduction rate was controlled by gas diffusion and inteffacial chemical reaction, and the apparent activation energy was 27.0±5.9 kJ/mol.