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搜集并评估了用CO及COH2气体还原铁的各类氧化物的反应表观活化能。分析了反应动力学条件与机理和表观活化能的关系。得出:在气体内扩散、界面化学反应及固态铁离子扩散控速条件下,反应3CO(G)+Fe2O3(S)→2Fe(S)+3CO2(G)的表观活化能分别为8.0～28.0kJmol,50.0～75.0kJmol及≥90.0kJmol,两个环节混合控速时的表观活化能则处于这两个环节分别控速时的表观活化能之间。界面化学反应控速时,用CO将Fe2O3还原为Fe3O4的表观活化能处于同一机理条件下将Fe2O3还原为Fe的表观活化能范围内;用COH2气体还原铁氧化物过程的表观活化能处于相应条件下,分别以CO,H2还原铁氧化物的表观活化能之间。
The apparent activation energy of various oxides of iron reduced by CO and COH2 gas was collected and evaluated. The relationship between reaction kinetics and mechanism and apparent activation energy was analyzed. The results show that the apparent activation energies of reaction 3CO (G) + Fe2O3 (S) → 2Fe (S) + 3CO2 (G) are 8.0 ~ 28.0kJmol, 50.0 ~ 75.0kJmol and ≥90.0kJmol, respectively. The apparent activation energy at the two controllable mixing speeds is between the apparent activation energy at the two control speeds. When the interface chemical reaction is controlled at a controlled rate, the apparent activation energy of reduction of Fe2O3 to Fe3O4 by CO is within the range of the apparent activation energy of reducing Fe2O3 to Fe under the same mechanism. The apparent activation energy of COH2 reduction of iron oxide Under the corresponding conditions, CO and H2 were used to reduce the apparent activation energy of iron oxides.