Abstract: According to issue of increasing cost and decreasing liquid quality by BOF recarburization process to melt medium and high carbon steel using semi-steel at Pan Gang, the chemical thermal compensating process by increasing silicon content of semi-steel is adopted, and based on dephosphorization thermodynamics in BOF and enrichment regularity of phosphor in slag, it is obtaind that enrichment phase of phosphor in slag is 2CaO • SiO₂. By using technologic measures such as fast slagging, reduce tapping temperature, it is obtained that the enrichment phase of phosphor in slag is increased, which improve the dephosphorization effect. Results of test indicate that the new thermal compensating process improves the thermal resource of semi-steel as well as shorten the slag forming time from 4. 1 min to 2. 5 min,and the average carbon content of steel at endpoint is of BOF 0.18% , it is obtaind that temperature is 1653 °C ,TFe content of slag is average reduced by 2. 81 percent point,phosphor content of steel is all less than 0.015% .

摘要： 针对攀钢转炉半钢冶炼中高碳钢增碳法增加成本降低钢水质量问题,采取了半钢增硅化学热补偿工艺,并根据对转炉脱磷热力学以及钢渣中磷富集规律,得出炉渣中磷的主要富集相为硅酸二钙。采用快速成渣、降低出钢温度等技术措施后,增加了炉渣中富磷相的比例,提高了脱磷效果。试验结果表明,新的热补偿工艺在提高半钢热源的同时,使得炼钢转炉成渣时间由4.1 min缩短到2.5 min,试验炉次转炉终点钢水碳含量平均为0.18%,温度平均为1653℃,炉渣TFe含量平均降低2.81个百分点,终点磷含量均控制在0.015%以内。

关键词: 120 t转炉半钢冶炼, 热补偿, 脱磷, 终点碳