预氧化对钒钛磁铁矿球团矿相及内部结构的影响  

Effects of Pre-oxidation on Phase Composition and Microstructure of Vanadium Titano-Magnetite

作　　者：陈双印[1] 储满生[1] 唐珏[1] 吴祥龙[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2013年第4期536-541,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重大资助项目(51090384);国家高技术研究发展计划项目(2012AA062302;2012AA062304);中央高校基本科研业务费专项资金资助项目(N110202001)

摘　　要：以钒钛磁铁矿为原料制备氧化球团,利用XRD和SEM等手段,考察室温至500,700,900,1 000,1 100,1 200,1 250℃7种情况下预氧化球团的物相组成和微观结构.结果表明,当预氧化温度低于500℃时,球团内部发生γ-Fe2O3向α-Fe2O3的转变,未发生氧化反应;当预氧化温度高于500℃时,随着预氧化温度的升高,球团内部的TTM和FeTiO3氧化生成TTH和Fe2TiO5,白色物相(含Fe,V,Ti)聚合长大与黑色物相(Mg,Al,Si相)逐渐分离,且晶型由较为分散的颗粒状向紧密互联、结构力强的互联状转变.Oxidized pellets were prepared with vanadium titanium-magnetite ores. The effects of pre-oxidation temperature from room temperature to 500, 700,900, 1 000, 1 100, 1 200, 1 250 ~C on phase composition and microstructure of the pellets were studied using XRD and SEM. When the pre-oxidation temperature was under 500 ^（2, the transformation of ^/-F%O3 to a-Fe203 occurred within the pellets without oxidizing reaction. While the pre-oxidation temperature was above 500 ^C, with the increase of the temperature, TTM and FeTiO3 within the pellets were oxidized and formed TTH and F%TiO5, the white phase （consisting of Fe, V, Ti） gathered and gradually separated from the black phase （consisting of Mg, A1, Si ）, and the crystal form transformed from relatively dispersive particles to a form with close interconnection and strong structure force.

关 键 词：钒钛磁铁矿 预氧化 物相组成 微观结构 晶型 

分 类 号：TF55[冶金工程—钢铁冶金]