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The reduction rate of Fe_tO in CaO-SiO_2-Al_2O_3-Fe_tO slags with graphite powder has been determined in an alumina crucible at 1 673-1 823 K.The effects of temperature,slag basicity and Fe_tO content on the reduction rate have also been discussed.Test results show that the reduction rate increases with the increase of temperature or Fe_tO concentration in slags,and the reduction rate has a parabolic relation with slag simple basicity or optical basicity.The maximum reduction rate is observed around CaO/SiO_2 = l.5 of molten slags.The reaction order is 1.26 or 1.31,and the reduction activation energy is 126.8 or 129.7 kJ/mol respectively in regard to Fe_tO content or Fe_tO activity calculated by using regular solution model.The reduction rate of Fe_tO in CaO-SiO_2-Al_2O_3-Fe_tO slags with graphite powder is in the range of 0.15×10~(-4)- 0.86×10~(-4) mol-O/cm~2 · s.
The reduction rate of Fe_tO in CaO-SiO_2-Al_2O_3-Fe_tO slags with graphite powder has been determined in an alumina crucible at 1 673-1 823 K. The effects of temperature, slag basicity and Fe_tO content on the reduction rate have also been discussed .Test results show that the reduction rate increases with the increase of temperature or Fe_tO concentration in slags, and the reduction rate has a parabolic relation with slag simple basicity or optical basicity. The maximum reduction rate is observed around CaO / SiO_2 = 1.5 of molten slags. The reaction order is 1.26 or 1.31, and the reduction activation energy is 126.8 or 129.7 kJ / mol respectively in regard to Fe_tO content or Fe_tO activity calculated by using regular solution model. The reduction rate of Fe_tO in CaO-SiO_2- Al 2 O 3 -Fe_tO slags with graphite powder is in the range of 0.15 × 10 -4 -0.8 × 10 -4 mol-O / cm 2 s.