The lesser slag steelmaking process of 150 t BOF by using green dolomite to replace partial lime and magnesia granule is carried out at Shiheng Special Steel

and the safety of heel slag remaining operation is improved by using optimizing " slag splashing + slag adjusting" process; with reasonable slag forming schedule

blowing scheme

adding suitable slag foaming agents and controlling slagging point

the dephosphorization rate of liquid is about 60% and the slagging rate is about 50% to effectively ensure the BOF steelmaking end-point

and the each index gets optimization i. e. the consumption of lime decreases to 30. 2 kg/t from 46. 7 kg/t

the consumption of light burned magnesia granule decreases to 8. 7 kg/t from 13. 3 kg/t

the consumption of oxygen is 47. 7 m

3

/t and the iron and steel material charging decreases to 1072. 1 kg/t from 1075.3 kg/t to realize steelmaking with safe

lesser slag

and low cost.