摘要
陶粒产量不足是这一多功能矿物材料大规模、持续性应用于绿色建材领域的瓶颈。以重庆南川地区富页岩层位为对象,研究区龙马溪组(S1l)中下部页岩在煅烧试验后膨胀系数N平均=4.1(边界品位N>2)。基于XRF、岩矿鉴定、SEM扫描电镜显示具膨胀性页岩特征,w(SiO_(2))约为62%、w(Al_(2)O_(3))约为19%、w(Fe_(2)O_(3))约为7%、w(CaO+MgO+K_(2)O+Na_(2)O)约为8.5%、TOC约为0.86%,矿物组合特征为石英+绿泥石+伊利石+斜长石,制备的页岩陶粒矿物组合为石英+赤铁矿+变质矿物。页岩矿物颗粒的定向排列和特殊结构对膨胀性具有促进作用。根据正交试验、单因素变量控制试验优化研究区煅烧制度为:粒径12~15 mm、升温速率12℃/min、煅烧温度1 200℃、保温时间20 min。研究可为区内陶粒用页岩矿产资源的开发利用提供参考。
The insufficient output of ceramsite has become the bottleneck restricting the scale and sustainable application of this multi-functional mineral material in the building materials market.Through taking the rich shale horizon in Nanchuan area of Chongqing as the object,it was found that the middle and lower shale of Longmaxi Formation(S_(1)^(l))in the study area had an average expansion coefficient of N=4.1 after calcination test(boundary grade N>2).Based on XRF,rock and mineral identification and SEM scanning electron microscopy,the characteristics of expansive shale are shown to be w(SiO_(2))62%,w(Al_(2)O_(3))19%,w(Fe_(2)O_(3))7%,w(CaO+MgO+K_(2)O+Na_(2)O_(3))8.5%,TOC of approximately 0.86%,and the mineral assemblage is characterized by quartz,chlorite,illite and plagioclase,and the prepared shale ceramsite mineral assemblage is quartz,hematite and metamorphic minerals.The directional arrangement and special structure of mineral particles in shale can significantly promote the expansibility.According to the orthogonal test and single factor variable control test,the calcination system in the study area is optimized as follows:particle size12~15 mm,heating rate 12℃/min,calcination temperature 1200℃,and holding time 20 min.It is hoped that this study can provide a basis for the development and utilization of ceramsite shale mineral resources in the study area.
作者
郭宇
牟佳佳
李勇
周琴
罗航
Guo Yu;Mu Jiajia;Li Yong;Zhou Qin;Luo Hang(107 Geology Team,Chongqing Bureau of Geology and Mineral Development,Chongqing 401120,China;School of Civil and Architectural Engineering,Yangtze Normal University,Chongqing 408100,China)
出处
《能源与环保》
2024年第1期112-118,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
重庆市规划和自然资源局科技项目(KJ-2021035)
重庆市教委科学技术研究项目(KJQN202101434)
重庆市大学生创新创业训练计划项目(S202210647024)。
关键词
陶粒页岩矿产资源
龙马溪组
正交试验
煅烧制度
ceramsite shale mineral resources
Longmaxi Formation
orthogonal test
calcination system
