纯化粉煤灰的改性及应用研究  

Study of Modification and Application of Purifying Fly Ash

作　　者：杨玉芬[1] 盖国胜[1] 郝向阳[1] 蔡振芳[1] 陈清如[2] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]中国矿业大学化学与环境工程学院,北京100083

出　　处：《中国矿业大学学报》2005年第6期716-720,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50474003)

摘　　要：为了提高粉煤灰的利用率,扩大应用领域,在Ca(OH)2-H2O-CO2系统,利用化学沉积方法成功地实现了粉煤灰颗粒的表面包覆,包覆后粉煤灰具有较高的白度和表面粗糙度.描述了复合粉煤灰的制备过程,研究了粉煤灰表面的包覆机理,借助SEM,BET,XRD等先进检测技术分析了粉煤灰改性前后的性能变化.试验结果表明:复合粉煤灰的白度由入料的33.54提高到73.13,比表面积由入料的3.07 m2/g增加到9.77 m2/g.在25%相同填充量的情况下,PP-复合粉煤灰的力学性能均优于未包覆粉煤灰、重质碳酸钙或轻质碳酸钙作填料的性能.In order to enhance utilization rate, enlarge application field of purifying fly ash （FA）, composite fly ash （CFA） with rough surface and high whiteness had been successfully prepared based on a chemical sedimentation principle in Ca （OH）2-H2O-CO2 system. The processing was described and the coating mechanism was studied by SEM, BET and XRD analyses. The results show that whiteness of CFA is increased to 73. 13 from 33.54 of original fly ash and its specific surface area changes from 3.07 m^2/g to 9.77 m^2/g. Under the same filling of 25%, the mechanical properties of PP-CFA composites are superior to these of PP-FA, PP-GCC or PP-PCC composites.

关 键 词：粉煤灰 纯化 包覆 

分 类 号：TQ172[化学工程—水泥工业]