锂云母对铝矾土尾矿低温烧结制备莫来石–刚玉复相陶瓷力学性能的影响  

Effect of Lepidolite on Mechanical Properties of Mullite–Corundum Composite Ceramics Prepared By Low Temperature Sintering of Bauxite Tailings

作　　者：陈新义 王淇 房明浩[1] 胡心悦 刘艳改[1] 吴小文[1] 米瑞宇[1] 黄朝晖[1] 闵鑫[1] CHEN Xinyi;WANG Qi;FANG Minghao;HU Xinyue;LIU Yangai;WU Xiaowen;MI Ruiyu;HUANG Zhaohui;MIN Xin(Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources,Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes,National Laboratory of Mineral Materials,School of Materials Science and Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,矿物材料国家专业实验室,非金属矿物与固废资源材料化利用北京市重点实验室,地质碳储与资源低碳利用教育部工程研究中心,北京100083

出　　处：《硅酸盐学报》2023年第3期757-766,共10页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划大宗低阶固废规模化制备高值矿物材料关键技术(2018YFC1901501);国家重点研发计划难处理微细粒尾矿精细分级与材料化利用研究与示范(2021YFC1910603)。

摘　　要：铝矾土尾矿是一种具有挑战性的固体废弃物,利用前景相对较小,大量堆存破坏生态环境,是铝土矿实现可持续开发利用过程中亟需解决的问题。以铝矾土尾矿为主要原料,添加铝矾土熟料、锂瓷石制备了莫来石–刚玉质复相陶瓷,通过添加了不同含量的锂云母,探究了其对莫来石–刚玉质复相陶瓷的性能影响。利用X射线衍射仪、扫描电子显微镜对陶瓷的物相组成和形貌进行分析,研究锂云母的含量、烧结温度等对陶瓷力学性能的影响。结果表明:锂云母的加入可降低陶瓷烧结温度,提高其力学性能,当添加质量分数为10%的锂云母、烧结温度为950℃,制得莫来石–刚玉质复相陶瓷的力学性能较好,满足建筑陶瓷材料应用领域及建筑砖使用要求,其物相组成为刚玉、莫来石、石英、赤铁矿、金红石及玻璃相,体积密度为1.75 g/cm3,导热系数为0.447 W/(m·K),收缩率为5.47%,常温抗压强度为74.87 MPa,在建筑陶瓷材料等领域具有广泛的应用前景。With bauxite tailings as the main raw material,adding bauxite clinker and lithium chinaite to prepare the traditional mulite–corundum multiphase ceramics,adding different contents of lepidolite,to explore the influence of the properties of mulite–corundum multiphase ceramics.The phase composition and morphology of ceramics were analyzed by X-ray diffractometer and scanning electron microscope.The effects of lepidolite content and sintering temperature on the mechanical properties of ceramics were studied.The results show that:The addition of lepidolite can reduce the sintering temperature and improve the strength of ceramics.When 10%lepidolite is added and the sintering temperature is 950℃,the strength of mulite–corundum multiphase ceramics is the highest,and the ceramics phase composition is corundum,mullite,quartz,hematite,rutile and glass,and the volume density is 1.75 g/cm~3,the thermal conductivity is 0.447 W/(m·K),the linear shrinkage is 5.47%,and the compressive strength is 74.87 MPa.It has a wide application prospect in the fields of thermal storage ceramics and refractory materials.

关 键 词：锂云母 铝矾土尾矿 低温烧结 

分 类 号：TD989[矿业工程—选矿] TQ174.1[化学工程—陶瓷工业]