摘要
采用正交试验方法研究了煅烧温度、煅烧时间、冷却方式、高岭土品质对偏高岭土火山灰活性的影响,并用功效系数法对其制备工艺参数进行优选。结果表明:影响高铁钛偏高岭土煅烧活性的因素由大到小顺序为煅烧时间、煅烧温度、高岭土品质、冷却方式。综合考虑经济效益、资源化利用及节能减排,最佳制备工艺参数为:煅烧温度850℃,煅烧时间2 h,空气中自然冷却。利用XRD和SEM对偏高岭土的活化机理进行分析,结果表明,偏高岭土可以改善水泥浆体孔结构,提高水泥浆体组织结构的均匀性与致密性。
The influences of calcination temperature, calcination time, cooling method and kaolin quality on pozzolanic activity of metakaolin were studied by orthogonal experimental design, and the process parameters were optimized by adopting the method of effect coefficient. The results showed that the effect order on the reactivity of the metakaolin from high to low was calcination time, calcination temperature, kaolin quality and cooling method. Considering the economic efficiency, resource utilization and energy conservation, the optimum process parameters were determined as follows：calcination temperature was 850 ℃, calcining time was 2 h, cooling method was natural cooling in air. XRD and SEM were used to study activation mechanism of metakaolin, and the result approved that metakaolin could improve the pore structure of hardened cement paste and improve the homogeneity and compactness of the cement paste.
出处
《非金属矿》
CSCD
北大核心
2017年第4期56-59,共4页
Non-Metallic Mines
基金
云南省科技富民强县计划项目(2014EA004)
关键词
高铁钛高岭土
偏高岭土
煅烧制度
正交设计
微观结构
high Fe-Ti kaolin
metakaolin
calcinated condition
orthogonal design
microstructural characteristics
