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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XRDS、EM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。
The mechanism of carbothermal reduction of ilmenite was studied by thermogravimetric analysis. The results show that the temperature is an important factor affecting the reduction of ilmenite. The increase of temperature leads to the reduction of ilmenite accelerating and deepening. The phase transformation, chemical composition and surface morphology of carbothermal reduction samples were analyzed by means of XRDS, EM and EDS. The analysis shows that the high content of impurities in the Bama ilmenite hinders the reduction of ilmenite, mainly because the enrichment zone formed by Mn2 + limits the complete reduction of Fe2 +. The phases in the reduced sample are mainly reduced Fe, rutile, rutile, Ti3O5 and tolidite solid melts. Kinetic studies have shown that the reduction temperature is the key factor to control the reaction rate.