预氧化对钒钛磁铁矿球团矿相及内部结构的影响

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500，700，900，1000，1100，1200，1250℃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-Fe2O3向α-Fe2O3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FeTiO3氧化生成TTH和Fe2TiO5，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.

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

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 °C, the transformation of γ-Fe2O3 to α-Fe2O3 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 Fe2TiO5, the white phase (consisting of Fe, V, Ti) gathered and gradually separated from the black phase(consisting of Mg, Al, Si), and the crystal form transformed from relatively dispersive particles to a form with close interconnection and strong structure force.