根据石灰石造渣制度的理论探讨和成渣机制分析,对转炉半钢炼钢应用石灰石造渣工艺进行工业实践研究.结果表明,采用石灰石造渣工艺冶炼半钢可使脱碳速率稳定在0.087％/100 Nm3～0.117％/100 Nm3,且拉碳成功率高达91.68％,此工艺具有较好的脱磷效果,可使终点钢液中[P]质量分数降低至0.013％ ～0.017％;石灰石造渣工艺终渣成分与单纯加入石灰造渣接比,其碱度较为接近,终渣MgO含量稍高,但是TFe含量较低,提高了金属收得率;该工艺能够显著降低石灰消耗7.0～19.0 kg/t,可降低冶炼成本.
According to the forming mechanism of limestone-slagging,industrial practice and research were conducted by using limestone for slagging during semi-steel steelmaking process in the converter.The results showed that by using limestone slagging process,the decarburization speed can reach stability between 0.087％/100 Nm3and 0.117％/100 Nm3,and the pull carbon success rate was as high as 91.68％.The process had better dephosphorization effect,which can reduce the endpoint mass fraction of [P] in molten steel to 0.013％-0.017％.Compared to the lime-slagging process,the slag alkalinity was similar,the MgO content of final slag was slightly higher,but the TFe content was lower by using limestone-slag process,which improved the metal yield.This process can significantly reduce the lime consumption by 7.0-19.0 kg/t and cut smelting cost.
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