摘要
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 energies of reactions of iron oxides reduced by CO or CO H 2 have been collected and assessed. The relations among the apparent activation energies, kinetic factors and mechanisms of the reactions are analyzed. The apparent activation energies assessed of the reaction 3CO(G)+Fe 2O 3(S)→2Fe(S)+3CO 2(G) take respectively the following values: 8.0～28.0 kJ/mol, 50.0～75.0 kJ/mol and ≥90.0 kJ/mol for the gas intrinsic diffusion, interfacial chemical reaction as well as solid state iron ion diffusion control. The apparent activation energies of the reactions under the mixed control of two steps take intermediate values between those if each of the steps controls the reactions. The range of apparent activation energy of Fe 2O 3→Fe 3O 4 controlled by chemical reaction falls within that of Fe 2O 3→Fe under the same mechanism. The apparent activation energies of the reactions with CO H 2 take intermediate values between those with CO or H 2 separately.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2000年第1期5-9,共5页
Journal of Iron and Steel Research
基金
国家自然科学基金!资助项目 ( 5 97740 2 3 )
