Abstract: The lime with 260, 401, 397 and 383 mL four kinds of activity is manufactured by calcined limestone. The ingredient of tested slag for desulphurization of hot metal is (/% :) 35.18〜44.84CaO, 13.80〜23.46SiO₂, 18.98Al₂O₃, 9. 49MgO, 1.89Fe₂O₃, 11.00CaF₂ with basicity 1.5~3.25, and the chemical composition of hot metal is (/% :) 4.53C, 0.16Si, 0.107S, 0.099P. The tested slag-metal ratio is 7：100 to 15：100 and the desulphurization test is in an induction furnace at 1330〜1390 °C. The sulphur content in metal in crucible is analyzed by a fluorescence analyzer, and the distribution of specific surface area and size of pore of lime are measured by an automate pressure mercury analyzer. The experiment is carried out by a single variable method to study the effect of slag basicity, melting temperature, slag-metal ratio and activity of lime on desulphurization of hot metal. The test results show that the lime with activity 397 mL is larger specific surface area and more uniform pore distribution, it has best desulphurization effect. With slag basicity 2.25, slagmetal ratio 15：100 and at 1390℃, by using lime with activity 397 mL the desulphurization ratio of metal is up to 97.2%.

摘要： 煅烧石灰石制备260,401,397,383 mL四种活性度的石灰。试验铁水脱硫渣成分为（/%）:35.18~44.84CaO，13.80~23.46SiO₂，18.98Al₂O₃，9.49MgO，1.89Fe₂O₃，11.00CaF₂，碱度为1.5~3.25，铁水成分为（/%）:4.53C，0.16Si，0.107S，0.099P。试验渣-铁比为7:100~15:100于电磁感应炉中在1330~1390℃进行脱硫实验。用荧光仪检测坩埚铁水中硫含量，并用全自动压汞仪测量石灰的比表面积和孔径分布。实验采用单一变量的方法，研究了石灰活性度，渣料碱度,熔炼温度，渣铁比对铁水脱硫的影响。实验表明,活性为397 mL的石灰比表面积较大，孔分布均匀,脱硫效果最好。在1390℃、碱度为2.25、渣铁比为15:100的条件下，活性度为397 mL的石灰，铁水脱硫率可达到97.2%。

关键词: 铁水, 脱硫, 石灰, 活性度