利用铁尾矿制备莫来石材料的研究  

Preparation of mullite materials with iron tailings

作　　者：孙家朐 刘新 丁璇 吴锋 罗旭东 Sun Jiaqu;Liu Xin;Ding Xuan;Wu Feng;Luo Xudong(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;不详)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]辽宁科技学院,辽宁本溪117004

出　　处：《耐火材料》2025年第1期54-58,共5页Refractories

基　　金：国家自然科学基金(U20A20239)。

摘　　要：为提升铁尾矿的综合利用率,以铁尾矿为硅源,Al(OH)_(3)为铝源,通过固相反应烧结法制备莫来石材料,研究了热处理温度(1250、1300、1350和1400℃保温3 h)对莫来石材料微观形貌及烧结性能的影响。结果表明:1)铁尾矿中的Fe^(3+)在固相反应过程中可以部分取代莫来石中的Al^(3+)形成含铁莫来石固溶体,导致晶格常数增大,使莫来石衍射峰向小角度偏移;2)热处理温度的升高使得体系中液相增多,莫来石形貌由颗粒状逐渐生长成柱状;3)经1350℃热处理3 h可以制备出综合性能优异的莫来石材料,其显气孔率为18.2%,体积密度为2.53 g·cm^(-3),常温抗折强度为58.8 MPa。To enhance the comprehensive utilization of iron tailings,mullite materials were prepared by the solid state reaction sintering method using iron tailings as the silicon source and Al(OH)_(3)as the aluminium source.The effects of heat treatment temperatures(1250,1300,1350 and 1400℃for 3 h)on the microscopic morphology and sintering properties of the mullite materials were investigated.The results show that:(1)Fe^(3+)in the iron tailings can partially replace Al^(3+)in mullite to form an iron-containing mullite solid solution during the solid state reaction,which leads to an increase in the lattice constant and a shift of mullite diffraction peaks to small angles;(2)increasing the heat treatment temperature produces more liquid phases in the system,and mullite grows gradually from granular to columnar;(3)after the heat treatment at 1350℃for 3 h,a mullite material with excellent comprehensive properties can be obtained with the apparent porosity of 18.2%,bulk density of 2.53 g·cm^(-3)and cold modulus of rupture of 58.8 MPa.

关 键 词：铁尾矿 莫来石 氢氧化铝 烧结性能 

分 类 号：TQ175[化学工程—硅酸盐工业]