镁铝尖晶石对铝钛渣合成钛酸铝的影响  

Influence of magnesium aluminate spinel on synthesis of aluminum titanate material from alumina titania slag

作　　者：何江荣 徐广平 宋一华 罗旭东[2] 谢志鹏[3] 

机构地区：[1]江苏中磊节能科技发展有限公司,江苏东台224213 [2]辽宁科技大学高温材料与镁资源学院,辽宁鞍山114051 [3]清华大学材料学院,北京100084

出　　处：《耐火材料》2015年第2期113-116,共4页Refractories

基　　金：国家自然科学基金项目(51402143)

摘　　要：为降低合成钛酸铝材料的原料成本,以铁合金厂铝钛渣为主要原料,按71.5%(w)铝钛渣和28.5%(w)二氧化钛粉的基础配方,分别外加质量分数1%、2%、3%和4%的添加剂镁铝尖晶石,以聚乙烯醇溶液为结合剂,经湿磨、干燥、机压成型后,分别在1 400、1 450和1 500℃保温2 h合成了钛酸铝材料,然后检测其体积密度和显气孔率,运用XRD和SEM分析物相组成和显微结构,并运用X’Pert Plus软件计算钛酸铝的晶格常数。结果表明:镁铝尖晶石中Mg2+对钛酸铝中Ti4+的置换作用导致钛酸铝的晶格常数增大,晶格发生畸变,从而促进钛酸铝的合成及其烧结;随着合成温度的升高,上述置换作用和促进钛酸铝合成、烧结的效应增强。Aluminum titanate material was prepared using alumina titania slag from ferroalloy factory as the main raw material, basing on the basic formulation of 71.5% （in mass,the same hereinafter） alumina ti- tania slag and 28.5% titanium dioxide powder,extra adding 1% ,2% ,3% and 4% of magnesium aluminate spinel as additive, respectively, adding polyvinyl alcohol solution as binder, wet milling, drying, pressing, then firing at 1 400, 1 450 and 1 500℃ for 2 h in order to cut raw materials cost of synthesizing aluminum titanate material. The BD and AP of the synthesized material were determined,the phase composition and microstructure were analyzed using XRD and SEM,and the aluminum titanate lattice constants of the syn- thesized material were determined using X＇ Pert Plus software. The results show that the Mg^2＋ in spinel re- places Ti^4＋ in aluminum titanate,causing the increase of aluminum titanate lattice constants and the distor- tion of crystal lattice, thus accelerating the synthesis and sintering of aluminum titanate; with the temperature rising ,the replacing and accelerating-effects strengthen.

关 键 词：合成钛酸铝 铝钛渣 镁铝尖晶石 晶格常数 烧结性 

分 类 号：TQ175[化学工程—硅酸盐工业]