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研究了在１７２３Ｋ下ＣＯ还原ＣａＯ－ＳｉＯ_２－Ａ１_２Ｏ_３－Ｆｅ_ｔＯ渣系。根据ＣＯ_２红外分析仪测定的出口气体中ＣＯ_２浓度变化，计算了炉渣的表现还原速度常数Ｋ_ａ和还原速度常数Ｋ。结果表明，加入Ａｌ_２Ｏ_３，提高了ＣａＯ－ＳｉＯ_２－Ｆｅ_ｔＯ的Ｋ_ａ和Ｋ值；炉渣碱度不变时，随着Ｆｅ_ｔＯ含量的增加，Ｋ_ａ呈增加趋势，但Ｋ则呈抛物线趋势变化；当ＦｅＯ的光学碱度∧_ＦｅＯ为１．０或０．８７时，Ｋ_ａ随该四元渣系光学碱度的增加而线性增加，而Ｋ则呈递减趋势。用炉渣规则溶液模型计算了ＣａＯ－ＳｉＯ_２－Ａｌ_２Ｏ_３－Ｆｅ_ｔＯ四元渣系的Ｆｅ_ｔＯ活度ａ_Ｆｅ_ｔＯ。
The reduction of CaO-SiO_2-Al_2O_3-Fe_tO slag system at 1723 K was studied. According to the change of CO_2 concentration in outlet gas measured by CO_2 infrared analyzer, the reduction rate constant K_a and reduction rate constant K of slag were calculated. The results show that K_a and K of CaO-SiO_2-Fe_tO increase with the addition of Al_2O_3. When the basicity of slag is constant, K_a increases with the increase of Fe_tO content, but K shows a parabolic trend. When basicity ∧_FeO was 1.0 or 0.87, K_a increased linearly with the increase of optical basicity of the quaternary slag, while K showed a decreasing trend. The Fe_tO activity a_Fe_tO of CaO-SiO_2-Al_2O_3-Fe_tO quaternary slag system was calculated by the slag regular solution model.