150t顶底复吹转炉少渣冶炼工艺实践

Practice of 150 t Top and Bottom Combined Blown Converter Steelmaking by Lesser Slag Process

石横特钢150 t转炉炼钢应用生白云石代替部分石灰和镁球进行少渣冶炼的工艺,采用优化的"溅渣+调渣"工艺改善了留渣的安全性;通过采用合理的造渣制度、吹炼制度、加入适量炉渣发泡剂、控制倒渣点,使得脱磷率约60%,排渣率约50%,有效保证了转炉的冶炼终点,各项指标得到了优化,石灰消耗从46.7 kg/t降低到30.2 kg/t;轻烧镁球消耗从13.3 kg/t降低到8.7 kg/t;氧气消耗为47.7 m^3/t;钢铁料消耗从1 075.3 kg/t降低到1 072.1 kg/t,实现安全、低成本少渣冶炼。

The lesser slag steelmaking process of 150 t BOF by using green dolomite to replace partial lime and mag- nesia 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 suit- able 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 con- sumption 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 ma/t and the iron and steel material charging decreases to 1 072.1 kg/t from 1 075.3 kg/t to realize steelmaking with safe, lesser slag and low cost.