采用场发射扫描电镜和全自动压汞仪研究了石灰的晶粒大小、比表面积、孔隙等微观结构，考察了煅烧时间、温度和压力对石灰活性度的影响规律，确定石灰微观结构与石灰活性度的关系. 结果表明，随石灰的比表面积、平均孔径和孔容积增加，石灰活性度先增大后减小，石灰比表面积约为2.0 m2/g、平均孔径约为850 nm、孔容积约为0.58 mL/g时石灰活性度最高.

The micro structure on the grain size, specific surface area and the pore structure of lime were analyzed by means of the field emission SEM and automatic pressure mercury, revealing the influence of calcination time, temperature and pressure on the activity of lime, determining the relationship between microstructure of lime and lime activity. The results showed that lime activity increases firstly and then decreases with the increasing of specific surface area, average pore diameter and pore volume of lime. When specific surface area is 2.0 m2/g around, the average pore size is about 850 nm, the hole volume is about 0.58 mL/g, the activity of lime is highest.