Phase transitions, micro-morphology and its oxidation mechanism in oxidation of ilmenite (FeTiO_3) powder  

钛铁矿(FeTiO_3)粉末的氧化过程中的物相转变、微观形貌及其氧化机制(英文)

作　　者：肖玮[1] 鲁雄刚[1] 邹星礼[1] 危雪梅[1] 丁伟中[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第8期2439-2445,共7页中国有色金属学报（英文版）

基　　金：Project(51074105) supported by the National Natural Science Foundation of China;Project(51225401) supported by the China National Funds for Distinguished Young Scientists

摘　　要：Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTi03 transforms to hematite and rutile when oxidation at 700-800 ℃, and pseudobrookite is formed when the oxidation temperature reaches 900 ℃. The initial ilmenite powder exhibits paramagnetism; however, after being oxidized at the intermediate temperature （800-850 ℃）, the oxidation product exhibits weak ferromagnetism. The oxidation mechanism was discussed. The microstructure observations show that a lot of micro-pores emerge on the surfaces of ilmenite particles at the intermediate temperature, which is deemed to be caoable ofenhancin~ the mass transfer ofoxgen during oxidation.探讨钛铁矿氧化过程中的物相转化、形貌改变及其氧化机理。在700～800℃时,钛铁矿(FeTiO3)转变为赤铁矿(Fe2O3)和金红石(TiO2),当温度高于900℃时,三价铁板钛矿开始形成。原始的钛铁矿粉末呈现顺磁性,但是经过中温(800～850℃)氧化后,氧化产物呈现弱铁磁性。同时,讨论钛铁矿的氧化机理。通过对微结构的观察,发现在中温氧化过程中颗粒表面出现大量微孔,其在氧化过程中能够强化氧的传质。

关 键 词：ILMENITE phase transitions MICRO-MORPHOLOGY oxidation mechanism 

分 类 号：TF046[冶金工程—冶金物理化学]