摘要
以铁尾矿为主要原料、稻壳为造孔剂,同时添加适量膨润土和长石作为黏结剂和助熔剂,烧结制备轻质保温墙体材料(LTIWM).通过正交试验和单因素试验,研究了原料配比和烧结温度对材料性能的影响,并利用综合差热分析仪(TG-DSC)、X射线衍射分析仪(XRD)和扫描电子显微镜(SEM)探讨其烧结机理.结果表明:铁尾矿、膨润土、稻壳和长石的最佳含量分别为46%,35%,9%和10%,最佳烧结温度为900℃,在此条件下制备的轻质保温墙体材料的体积密度、抗压强度、显气孔率和导热系数分别为1.2294g/cm^3,7.6MPa,45.54%和0.2925W/(m·K);烧结过程可分为干燥脱水、造孔、黏结和冷却4个阶段;材料的主要矿物组成为石英、赤铁矿、莫来石、钾长石、钠长石和钙长石;材料内部晶体发育完善,玻璃相含量和显气孔率适中,具备良好的综合性能.
The lightweight thermal insulation wall material(LTIWM) was prepared with iron tailings as the main raw materials, rice husk as the pore-forming agent, together with appropriate amount of bentonite and feldspar as the binder and the flux, respectively. The effect of raw materials ratio and firing temperature on the properties of wall material was studied by orthogonal test and single factor test, and the firing mechanism was investigated by thermal analysis instrument(TG-DSC), X-ray diffraction(XRD) and scanning electron microscope(SEM). The results show that the optimal contents of iron tailings, bentonite, rice husk and feldspar are 46%, 35%, 9% and 10%, respectively, and the optimal firing temperature is 900℃. The bulk density, compressive strength, apparent porosity and thermal conductivity of the prepared wall materials under the optimal conditions are 1.2294 g/cm^3, 7.6 MPa, 45.54% and 0.2925 W/(m·K), respectively. The firing process can be divided into four stages as dry dehydration, pore formation, bonding and cooling. The main mineral compositions of the materials are quartz, hematite, mullite, microcline, albite and anorthite, the internal crystals are well developed, and the glass phase content and porosity are moderate, which ensure the good performances of the material.
作者
陈永亮
石磊
杜金洋
张惠灵
焦向科
CHEN Yongliang;SHI Lei;DU Jinyang;ZHANG Huiling;JIAO Xiangke(School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Province Key Laboratory for Efficient Utilization and Agglomeration for Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China;School of Resource and Environment Engineering, Hubei University of Science and Technology, Xianning 437100, China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2019年第5期721-729,共9页
Journal of Building Materials
基金
湖北省教育厅科学技术研究项目(Q20141108)
冶金矿产资源高效利用与造块湖北省重点实验室项目(2016zy009)
“十三五”国家重点研发计划项目(2017YFC070330012)
江西省自然科学基金资助项目(20171BAB206009)
江西省教育厅项目(GJJ160611)
关键词
铁尾矿
轻质保温墙体材料
性能
烧结过程
微观结构
iron tailings
lightweight thermal insulation wall material(LTIWM)
performance
firing process
microstructure
作者简介
第一作者:陈永亮(1977—),女,湖北浠水人,武汉科技大学副教授,博士.E-mail:chenyongliang@wust.edu.cn.
