利用热重分析法对钛铁矿的碳热还原机理进行了研究.结果表明,温度是影响钛铁矿还原程度的重要因素,温度升高导致钛铁矿的还原速率加快、还原程度加深.通过XRD、SEM及EDS等分析手段对碳热还原样品的相变化、化学组成及表面形貌等进行了分析.分析表明,巴马钛铁矿中高含量杂质阻碍了钛铁矿的还原,主要在于Mn2+形成了富集区限制了Fe2+的完全还原.还原样品中的相主要为还原Fe、金红石、还原金红石、Ti3O5和假板钛矿固熔体.动力学研究表明还原温度是控制反应速率的关键因素.%Studies on carbothermic reduction mechanism of ilmenite were conducted by thermogravimetry(TG). The results showed that temperature was an important influencing factor for reduction degree of ilmenite. The reduction rate of ilmenite became faster and reduction degree became deeper with the increase of temperature. Analysis on the phase transformation, chemical composition and surface morphology of carbothermic reduction samples was carried out by XRD, SEM and EDS. The analysis showed that high content impurities in Bama ilmenite resisted the reduction of ilmenite, mainly bacause enrichment zone of Mn2+ formed and prevented complete reduction of Fe2+. The phases in reduction samples were mainly reduced iron, rutile, reduced rutile, Ti3O5 and pseudobrookite solid solution. Kinetic study showed that reduction temperature was a key factor to control reaction rate.
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