Abstract: Thermodynamics and material balance analysis were adopted, based on which theoretical simulations were carried out, and the key point of the process was got. The low temperature and proper basicity of the dephosphorization stage was better for the phosphorus removal, and the higher the deslagging ratio was, the smaller quantity of lime was consumed, and the smaller the slag quantity generated. Results of the trial experiments showed that, the lime and dolomite quantity dropped by 25% and 36.67% respectively, and the average dephosphorization rate of 62.95% during the dephosphorization stage and 90.72% during the total process were got. By means of influencing factors analysis of dephosphorization rate, the control technology of dephosphorization stage was concluded that，the basicity of the slag was 1.8~2.0, the mass fraction of T.Fe was 16%~20%, and the temperature of the bath was 1400~1420℃. And the control technology of decarburization stage was concluded as, the basicity of the slag was 3.20~3.60, the mass fraction of T.Fe was 16%~20%, and the temperature of the bath was 1600~1640℃.

Key words: Key words: dephosphorization rate, deslagging ratio, slag weight, less slag steelmaking process