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首页> 外文期刊>ISIJ international >Reduction of CaO–Fe2O3 Series Compounds by CO
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Reduction of CaO–Fe2O3 Series Compounds by CO

机译：县减少CaO–Fei 2 O 3 系列化合物

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The isothermal reduction kinetics of C_(2)F, CF, and CF_(2) by 30% CO and 70% N_(2) at 1123 K (850°C), 1173 K (900°C), and 1223 K (950°C) were investigated by thermogravimetric analysis in this study. Results indicated that the maximum reduction degree increased and its corresponding reduction time decreased by the order of C_(2)F, CF, and CF_(2). The reduction rate analysis by peak fitting based on the Gauss rule revealed that the C_(2)F, CF, and CF_(2) reductions were typical one-step, two-step, and three-step reactions, respectively. Fe_(3)O_(4) to FeO stage overlaps with the following FeO to Fe stage and tends to approach the previous Fe_(2)O_(3) to Fe_(3)O_(4) stage in reduction of CaO–Fe_(2)O_(3) system with an increase in Fe_(2)O_(3) content. The apparent activation energy of the sample C_(2)F, CF, and CF_(2) reductions were 51.74, 46.89, and 34.37 kJ/mol, respectively, indicating that reduction proceeds more easily for them. The ln-ln and Sharp analysis implied that the C_(2)F reduction was described by the Avrami–Erofeev function, thus appeared as a 2D reaction during the whole reaction, whereas the CF and CF_(2) reductions were expressed initially by a 2D reaction when α <0.5 and subsequently by a 3D reaction when α >0.5. In the new proposed reduction model, the Fe_(2)O_(3) content increases in the CaO–Fe_(2)O_(3) system from C_(2)F to CF_(2) and the gradual promotion of the reduction rate leads to the reduction process of the C_(2)F, CF, and CF_(2) samples occurring by a 2D tending to 3D reaction mechanism.
机译：C_（2）F，CF和CF_（2）在1123 K（850°C），1173 K（900°C）和1223 K（在本研究中，通过热重分析研究了950°C）。结果表明，最大还原度增加，相应的还原时间减少了C_（2）F，CF和CF_（2）的顺序。通过基于高斯规则的峰拟合进行的还原率分析显示，C_（2）F，CF和CF_（2）还原分别是典型的一步反应，两步反应和三步反应。 Fe_（3）O_（4）到FeO阶段与随后的FeO到Fe阶段重叠，并且在还原CaO–Fe_（ 2）O_（3）系统，其中Fe_（2）O_（3）含量增加。样品C_（2）F，CF和CF_（2）还原的表观活化能分别为51.74、46.89和34.37 kJ / mol，表明它们的还原更容易进行。 ln-ln和Sharp分析表明，C_（2）F的降低是由Avrami-Erofeev函数描述的，因此在整个反应过程中均显示为二维反应，而CF和CF_（2）的还原最初由a当α<0.5时进行2D反应，随后通过α> 0.5进行3D反应。在新提出的还原模型中，CaO–Fe_（2）O_（3）系统中的Fe_（2）O_（3）含量从C_（2）F增大到CF_（2），并且还原速率逐渐提高导致C_（2）F，CF和CF_（2）样品通过2D趋于3D反应机理发生还原过程。

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