摘要
采用脱硫石膏和CaO作为活性激发剂,利用700℃低温热活化法活化煤矸石,与矿渣、水泥熟料混合制备出煤矸石质胶凝材料,并研究了激发剂和混磨方式对北京房山煤矸石进行热蚀变活化的影响。运用X射线衍射(XRD)分析和化学全分析表征煤矸石活化前后的微观特性;运用胶砂试块强度分析和扫描电镜(SEM)分析表征煤矸石质胶凝材料的胶凝活性。结果表明:采用湿法热蚀变活化法,煤矸石中的高岭石在700℃可以完全脱水、分解成活性S iO2和A l2O3。采用该原料制备出的煤矸石质胶凝材料具有较高的早期强度,水化28d的硬化浆体结构密实。
Coal gangue-containing cementitious materials were prepared by using desulfurized gypsum and CaO as reactive activator and using thermal activation at the low temperature of 700℃ activating the coal gangue,which was mixed with slag and cement clinker.Meanwhile,the effect of the activator and the way of mix grinding on hydrothermal alteration for the coal gangue in Fangshan Beijing was studied.The micro-features of coal gangue before and after activating was characterized by XRD and full chemical analysis.At the same time,the cementitious activity of coal gangue-containing cementitious materials was characterized by Mortar strength analysis and SEM.The results show that by the way of hydrothermal alternation,the kaolinite in the coal gangue can be completely dehydrated and decomposed into SiO2 and Al2O3.Also,the coal gangue-containing cementitious materials prepared have high early strength and the hardened paste hydrated for 28d has dense structure.
出处
《矿产综合利用》
CAS
2011年第3期36-39,共4页
Multipurpose Utilization of Mineral Resources
基金
北京市科委重大科技项目"煤矸石的资源化利用"(项目编号:D07040300690000)
关键词
煤矸石
热蚀变
固体废弃物
胶凝材料
Coal gangue
Hydrothermal alteration
Solid waste
Cementitious materials
