硅藻土的火山灰活性研究  

Study on the Pozzolanic Activity of Diatomite

作　　者：王浩林[1] 李金洪[1] 侯磊[1] 刘芳[1] 马玺[1] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《硅酸盐通报》2011年第1期19-24,49,共7页Bulletin of the Chinese Ceramic Society

基　　金：教育部新世纪优秀人才支持计划资助(NCET-08-0828);矿物岩石材料国家专业实验室开放课题(08A002)

摘　　要：采用ICP-OES法,研究了煅烧条件对硅藻土火山灰活性的影响。运用XRD、FT-IR、SEM及EDS等表征方法,对煅烧过程中硅藻土的物相、结构、形貌变化及火山灰活性的作用机理进行了研究和探讨。结果表明：700~1100℃,硅藻土可基本保持多孔结构,仍含有适当数量的活性S i-OH,800℃煅烧硅藻土的火山灰活性最高;粘土矿物在700℃时脱去羟基水,继续升温使层状结构破坏,火山灰活性降低。800℃时保温1 h,可使火山灰活性成分含量由未煅烧时的22.15%提高到37.21%。硅藻土的火山灰活性变化的主要原因是高温作用下宏观孔道结构、表面结构和晶体结构变化综合作用的结果。In this paper,the influence of calcined condition on the pozzolanic activity of diatomite was determined according to ICP-OES analysis.Phase transformation,microstructure of diatomite,and mechanism of pozzolanic activity during calcination were investigated using XRD,SEM,EDS and FT-IR methods.The results indicate that mircroporous structure and Si-OH cluster in diatomite favor the pozzolanic activity,especially when calcined at 800 ℃.Layered structure of clay minerals is destroyed as a result of removal of water,which leads to a lower pozzolanic activity.After being calcined at 800 ℃ for 1 h,the proportion of pozzolanic compositions increase from 22.15% to 37.21%.Marco-pore structure,surface structure and crystal structure of diatomite are changed in high temperature,resulting in the level of pozzolanic activity.

关 键 词：硅藻土 火山灰活性 煅烧 物相 结构 

分 类 号：TQ172[化学工程—水泥工业]