石灰微观结构对铁水脱磷的影响

Effect of Microstructure of Lime on Dephosphorization of Melted Iron

采用全自动压汞仪测量了石灰的比表面积、平均孔径、孔容积和体积密度。采用场发射扫描电镜和X射线衍射仪分析了渣的微观结构和成分。确定了各种因素对脱磷率的影响规律。结果表明,随着石灰活性度的增加,石灰脱磷率逐渐增加;随着石灰比表面积、体积密度的增加,脱磷率均先增加后减小;随着石灰平均孔径、孔容积的增加,脱磷率逐渐增加。大部分造渣剂的脱磷率在66%以上,最高可达93.69%。

The specific surface area, average pore diameter, pore volume and bulk density oflime was analyzed by means of the automatic pressure mercury. The microstructure and slag were analyzed by field emission scanning electron microscope and X- ray diffractometer. So theinfuence of various factors on the dephosphorization rate was determined. The results showed that with the increase of lime activity, the dephosphorization rate of lime gradually increased; with the increase of specific surface area and bulk density of lime, the dephosphorization rate of lime first increased and then decreased; with the increase of average pore diameter and pore volume of lime,the dephosphorization rate of lime gradually increased. The dephosphorization rate of most slag wasabove 66% , the highest value being 93.6 9 % .