Abstract: The desulphurization test of pretreated hot metal using four different structure active limes with specific surface area 1.891-2.664 m²/g and average pore diameter 575.5-814.9 nm is carried out in a high vacuum arc melting spinning quenching machine. The surface morphology of different lime sample is analyzed by scanning electron microscope and the specific surface area and the average pore diameter of lime are measured by a fully automatic mercury injection apparatus. Experimental results show that with increasing the average hole diameter, the desulphurization rate of hot metal decreases and with increasing the specific surface area the desulphurization rate increases ； the optimum ratio of desulphurization agent is 1：50, in this case the sulphur content in hot metal decreases to 0.001 % from 0.014%.

Key words: Hot Metal Pretreatment, Lime, Microscopic Structure, Desulphurization Rate, Ratio of Desulphurization Agent

摘要： 采用比表面积1.891~2.664 m²/g和平均孔径575.5~814.9 nm四种不同结构的活性石灰在高真空电弧熔炼旋淬一体机中进行铁水预处理脱硫实验。用扫描电子显微镜分析不同石灰样品表面形貌,并用全自动压汞仪测量石灰的比表面积和平均孔径。实验结果表明铁水脱硫率随着石灰平均孔径的增大而减小,随着比表面积增大而提高;最佳脱硫剂配比为1:50。可将铁水中硫含量从0.014%脱至0.001%。

关键词: 铁水预处理, 石灰, 微观结构, 脱硫率, 脱硫剂配比