100 t转炉应用石灰石造渣半钢炼钢工业实践

Industrial Practice on Using Limestone as the Semi-steel Steelmaking Slagging Material in 100 t-capacity Converter

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 Nm^3~0.117%/100 Nm^3,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 research were conducted by using limestone for slagging of limestone-slagging, industrial practice and 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 Nm^3 and 0. 117%/100 Nm^3, and the pull carbon success rate was as high as 91.68%. The process had better dephosphorization effect, which can reduce the end- point 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.