中文摘要：

通过等温热重实验分析CO／C02／N2气氛中硼铁精矿还原和无烟煤气化的动力学特性，求得Fe3O4→FeO和FeO→Fe两个还原阶段及碳素溶损反应的活化能分别为74．72，65．74与194．72kJ／mol．建立了硼铁精矿含碳球团还原过程数学模型，并通过实验验证了模型的准确性．考察了球团尺寸、孔隙率、反应活化能对金属化率的影响，结果表明，球团尺寸从φ16mm×8mm增加至φ32mm×16mm，前期还原速率降低，但最终金属化率从85％上升至99．4％；球团孔隙率对还原过程影响较小；碳素溶损反应活化能上升抑制还原进行，但对最终金属化率没有影响，而当界面还原活化能从初始值的0．95倍上升至1．05倍时，不仅反应速率下降，最终金属化率也从99．59％降低至94．81％．从活化能对还原过程影响推断，反应前期还原过程受碳气化和铁氧化物还原联合控制，后期为铁氧化物还原反应控制．

英文摘要：

The kinetic characteristics of reduction of boron-bearing iron concentrate and Boudouard reaction are studied by isothermal thermogravimetric analysis in CO/COz/N2 atmosphere. The activation energy is assessed as 194.72, 74.72 and 65.74 kJ/mol for Boudouard reaction and the reduction reaction stages of Fe3O4→FeO and FeO→Fe, respectively. On the basis of these kinetic parameters, a mathematical model of carbothermic reduction of boron-bearing iron concentrate is built up, which is validated by comparison of the computed results with the experimental data. The effects of pellet size, porosity and activation energy are discussed based on the calculated results. The increase of pellet size from φ16 mm×8 mm to φ32 mm×16 mm slows down the initial reduction rate, but elevates the ultimate metallization rate from 85% to 99.4%. The effect of porosity on the reduction process is relatively slight. The rise in activation energy of Boudouard reaction suppresses the proceeding of reduction, but has little impact on the ultimate metallization rate; When the activation energy of the interface reduction increases from 95% to 105% of the original value, not only the reduction rate decreases, but also the ultimate metallization rate declines from 99.59% to 94.81%. It can be deduced from the effect of activation energy that the reduction process is initially under the mixed control of interfacial reduction and Boudouard reaction, but under control of interracial reduction in the later stage.