贝壳煅烧产物的微观结构及活性度研究  

Research on active degree and microstructure of calcined shells

作　　者：郝华强[1,2] 张朝发 张玉柱[1,3] 郝素菊 马旭朝 Hao Huaqiang Zhang Chaofa Zhang Yuzhu Hao Suju Ma Xuzhao(School of Metallurgy, Northeastern University, Shenyang 110819, China Metallurgy and Energy School, North China University of Science and Technology, Tangshan 063009, China Hesteel Group Tangsteel Company, Tangshan 063016, China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]河钢集团唐钢公司,河北唐山063016 [3]华北理工大学冶金与能源学院,河北唐山063009

出　　处：《武汉科技大学学报》2016年第6期434-438,共5页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51174075)

摘　　要：分别以海螺壳和青蛤壳为原料，在不同煅烧条件下制备活性石灰。借助SEM、XRD、压汞仪及酸碱滴定法等手段，分析了煅烧温度及煅烧时间对产物活性度及微观结构的影响。结果表明，海螺壳和青蛤壳的晶体结构不同，但其煅烧产物均可获得340～360mL的活性度；随煅烧温度的提高和煅烧时间的延长，产物中CaO晶粒逐步长大，发育程度提高；在煅烧温度为1050℃、煅烧时间为90min时，CaO晶粒开始出现黏结，继续提高煅烧温度或延长煅烧时间会出现过烧现象，产物的活性度开始降低；当产物孔隙率为45％～50％时，青蛤壳煅烧产物的活性度可达360mL左右。In this paper, the active lime was prepared under different calcination conditions by emplo- ying the conch shell and the cyclina sinesis shell, respectively. By means of SEM, XRD, mercury po- rosimetry and acid-base titration, the effects of calcination temperature and calcination time on active degree and microstructure of the products were investigated. The results show that, in spite of differ- ent crystal structures, the active degree of both calcined products can reach 340~360 mL. With the rising of calcination temperature and the elongation of calcination time, the CaO crystallites in prod- ucts grow larger gradually. When the temperature is 1050 ℃ and the time is 90 min, the CaO grains begin to bond together. Moreover, the overburning phenomenon will encounter with the further in- crease of calcination temperature and Calcination time, which may lead to the decrease of active degree. On the other hand, as the porosity is in the range of 45%-50%, the active degree of calcined product of cyclina sinesis shell reaches around 360 mL.

关 键 词：贝壳 CACO3 煅烧 活性度 微观结构 

分 类 号：TQ175[化学工程—硅酸盐工业]