Abstract: By analysis on steelmaking data of 150t BOF 3000 heats with 10% 〜17% FeO in slag, slag melting point less than 1450°C and viscosity 1.0 ~1.2 P, it is obtained the effect of BOF index of oxidation of slag (IOS) and slag optical basicity Λ_x on slag-steel phosphor partition ratio. In order to improve the dephosphorizing capacity, in BOF steelmaking model the dynamic amount of lime addition is set to promote the optical basicity Λ_x of end slag near to aim Λ_x =0. 7 ±0. 01 with slag ingredient near to 2CaO·SiO₂ phase； and in steelmaking model, by priority selecting the aim hot metal reduction index Rli 5. 8 ~ 6. 6, setting the aim oxygen blowing index OMI 1.05 ~ 1.20, and optimizing the index of oxidation of slag IOS bing 10 ~ 15, the iron loss decreases and the dephosphorization effect is ensured.

Key words: 150t BOF,Steelmaking, Dephosphorization, Slag Basicity, Oxidation, Process Practice

摘要： 通过对150t转炉3000炉次冶炼数据的分析,得出炉渣中FeO 10%~17%,炉渣熔点1450℃以下,粘度1.0~1.2P时转炉炉渣氧化性IOS和炉渣光学碱度Λ_x对渣-钢磷分配比L_p的影响。为提高炉渣的脱磷能力,在转炉冶炼模型中动态设定石灰加入量,促使终渣光学碱度接近目标范围Λ_x=0.74±0.01,渣组成接近于2CaO·SiO₂相;当前冶炼模型中优先选择铁水还原性指数RIi目标为5.8~6.6,吹氧指数OMI设置目标1.05~1.20,优化炉渣氧化性指数IOS在10~15,能减少钢铁料损失和保证炉渣良好的脱磷效果。

关键词: 150t转炉冶炼, 脱磷, 炉渣碱度, 氧化性, 工艺实践