赤泥低温烧结制备长石—刚玉质复相陶瓷  

Low-Temperature Preparation of Feldspar-Corundum Composite Ceramics from Red Mud

作　　者：陈新义 房明浩[1,2,3] 王淇 刘艳改 吴小文[1,2,3] 米瑞宇 黄朝晖[1,2,3] 闵鑫 CHEN Xinyi;FANG Minghao;WANG Qi;LIU Yangai;WU Xiaowen;MI Ruiyu;HUANG zhaohui;MIN Xin(China University of Geosciences(Beijing) School of Materials Science and Technology, Beijing 100083, China;Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, Beijing 100083, China;National Laboratory of Mineral Materials, 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,北京100083 [2]非金属材料和固废资源材料利用北京市重点实验室,北京100083 [3]矿物材料国家专业实验室,北京100083

出　　处：《矿产保护与利用》2021年第6期103-111,共9页Conservation and Utilization of Mineral Resources

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)。

摘　　要：以拜耳法赤泥为主要原料,添加铝矾土熟料、锂瓷石在低温条件下制备长石-刚玉质复相陶瓷。利用X射线衍射仪(XRD)、扫描电镜(SEM)对陶瓷的物相组成和形貌进行分析。研究了赤泥的含量、烧结温度等对陶瓷的体积密度、收缩率、吸水率、孔隙率、抗压强度的影响。研究结果表明:当赤泥在原料中的质量分数为60%、烧结温度为1050℃时,制得复相陶瓷的性能最优,其物相组成为钙长石、刚玉、赤铁矿、石英、玻璃相以及少量的莫来石相,体积密度为1.85 g/cm^(3),收缩率为7.34%,吸水率为19.87%,抗压强度为79.48 MPa,其有害组分的溶出试验进一步表明钠、钾、钙等有害元素均稳定固化在产物中,产品在墙体装饰、陶瓷和耐火材料等领域具有广泛的应用前景。Using bayer red mud as the main raw material,adding vanadium clay clinker and lithium porcelain stone,feldspar-corundum ceramics were prepared at low temperature.The phase composition and morphology of ceramics were analyzed by X-ray diffractometer(XRD)and scanning electron microscope(SEM).The effects of the amount of red mud and sintering temperature on the volume density,shrinkage,water absorption,porosity and compressive strength of ceramics were studied.The results show that:When the amount of red mud is 60%and the sintering temperature is 1050℃,the properties of the multiphase ceramics are the best,and the phase composition is anhydrite,corundum,hematite,quartz,glass phase and a small amount of mullite phase.The volume density is 1.85 g/cm^(3),the shrinkage rate is 7.34%,the water absorption rate is 19.87%,and the compressive strength is 79.48 mpa.The dissolution experiment of harmful components further showed that sodium,potassium,calcium and other harmful elements were stabilized in the product,which has a wide application prospect in the field of wall decoration and refractory materials.

关 键 词：赤泥 陶瓷 低温烧结 有害元素固化 

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