低铝莫来石中FeOx和TiOx固溶行为研究现状  

Solid Solution Behavior of FeOx and TiOx in Low-Alumina Mullite

作　　者：岳茜 李勇[1] 蒋朋[1] 张秀华[1] YUE Xi;LI Yong;JIANG Peng;ZHANG Xiuhua(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2023年第3期669-676,共8页Journal of The Chinese Ceramic Society

基　　金：科技部重点研发计划(2021YFB3701400)。

摘　　要：铝矾土矿中通常含有一定量的铁和钛的氧化物,且常规的选矿工艺难以同时将铁和钛的氧化物除去。采用烧结法用铝矾土制备莫来石的过程中,铁和钛的氧化物会形成低熔点物相,导致莫来石的高温性能弱化。基于莫来石开放的空间结构以及随着温度和气氛的变化可以容纳不同的金属离子的特性,本文综述了铁氧化物和钛氧化物在莫来石中的固溶行为。1400~1700℃时TiO2在莫来石中的固溶度为1.36%~4.10%(质量分数)。在1300℃时,10%~12%的Fe_(2)O_(3)在莫来石微结构中形成固溶体。Ti^(3+)和Fe^(2+)在莫来石中固溶度很低。并且铁和钛与莫来石形成固溶体对莫来石性能的提升有限。本文对含铁含钛的莫来石的高效化利用做出了展望。Bauxite ores usually contain some iron and titanium oxides,which are difficult to remove simultaneously with conventional beneficiation processes.The oxides of iron and titanium will form low melting point phases during the preparation of mullite by sintering with bauxite,resulting in a reduction of the high-temperature properties of mullite.This review represented the solid solution behavior of iron oxides and titanium oxides in mullite based on the open spatial structure of mullite and its ability to accommodate different metal ions at different temperatures and atmospheres.The solubility of TiO2in mullite is 1.36%–4.10%at1400–1700℃.Fe_(2)O_(3)of 10%–12%can make a solid solution in mullite microstructure at 1300℃.Ti^(3+)and Fe^(2+)are poorly solidified in mullite.Moreover,the formation of solid solutions of iron and titanium with mullite provides a limited enhancement of mullite properties.In addition,the efficient use of mullite containing iron and titanium was also discussed.

关 键 词：低铝莫来石 铁氧化物 钛氧化物 固溶行为 

分 类 号：TQ175[化学工程—硅酸盐工业]