首页|Reduction of CaO-Fe_2O_3 Series Compounds by CO
Reduction of CaO-Fe_2O_3 Series Compounds by CO
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NETL
NSTL
Iron Steel Inst Japan Keidanren Kaikan
The isothermal reduction kinetics of C_2E CF, and CF_2 by 30% CO and 70% N_2 at 1 123 K (850℃), 1 173 K (900℃), and 1 223 K (950℃) 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_2F, CF, and CF_2. The reduction rate analysis by peak fitting based on the Gauss rule revealed that the C_2F, CF, and CF_2 reductions were typical one-step, two-step, and three-step reactions, respectively. Fe_3O_4 to FeO stage overlaps with the following FeO to Fe stage and tends to approach the previous Fe_2O_3 to Fe_3O_4 stage in reduction of CaO-Fe_2O_3 system with an increase in Fe_2O_3 content. The apparent activation energy of the sample C_2F, 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 In-In and Sharp analysis implied that the C_2F 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_2O_3 content increases in the CaO-Fe_2O_3 system from C_2F to CF_2 and the gradual promotion of the reduction rate leads to the reduction process of the C_2F, CF, and CF_2 samples occurring by a 2D tending to 3D reaction mechanism.
C_2FCFCF_2isothermal reduction kineticsapparent activation energyreduction model
NETL
NSTL
Iron Steel Inst Japan Keidanren Kaikan
