High Efficiency Dephosphorization by Mixed Injection during Steelmaking Process

摘要

> A new dephosphorization technology with introduction of partial CO2 into O2 is proposed in this paper. Thermodynamic characteristics and dephosphorization mechanism by introduction of CO2 are analyzed and the results show that using CO2 as partial dephosphorization oxidant can change the selective oxidation condition of steelmaking system, control the temperature of bath, strengthen the stirring ability, and finally obtain a high efficiency of dephosphorization. Meanwhile, the relationship between selective oxidation temperature T of C and P, partial pressure of CO gas, slag activity, and compositions of melt is obtained as follows. T = ( P CO / P 0 ) 0.0401 a 4 CaO · P 2 O 5 0.0080 · exp ( ? 0.0403 [ % C ] ? 0.0030 [ % Si ] + 0.0011 [ % Mn ] + 0.3515 [