CaO-Fe<sub>2</sub>O<sub>3</sub>混合层内反应初期铁酸钙生成的动力学研究

CaO-Fe₂O₃混合层内反应初期铁酸钙生成的动力学研究

摘要: 从理论上导出了CaO-Fe₂O₃混合层内反应初期铁酸钙生成的动力学模型:
1-k₁(1-k₂BR_v)^2/3-k₂(1+k₁BR_v)^2/3=(2k₁M_f/ρ_fr_f²)·D_cΔCt。
其中k₁=(ρ_f-ρ_cf)/(ρ_f-ρ_c),k₂=(ρ_cf-ρ_c)/(ρ_f-ρ_c),B=1+M_cρ_fm/M_fρ_c。经1160℃和1190℃下的基础实验表明,模型与实验数据吻合很好,同时得到该两温度水平下氧化钙在铁酸一钙有效扩散系数分别为4.34×10^-9cm/s和2.32×10^-8cm/s。

Abstract: Kinetical model of calcium ferrite formation at initial stage of reaction in CaO-Fe₂O₃ mixed bed was obtained by using terms of theory as follows:
1-k₁(1-k₂BR_v)^2/3-k₂(1+k₁BR_v)^2/3=(2k₁M_f/ρ_fr_f²)·D_cΔCt.br/>其中k₁=(ρ_f-ρ_cf)/(ρ_f-ρ_c),k₂=(ρ_cf-ρ_c)/(ρ_f-ρ_c),B=1+M_cρ_fm/M_fρ_c. The results calculated by this model is identical very well with the experimental data, and the interdif-fusion coefficients of CaO in monocalcium ferrite were determined as 4.34×10^-9cm²/s and 2.32×10^-8cm²/s respectively at 1160 and 1190℃.