铁铝尖晶石合成的热力学分析与制备方法比较

摘要

The thermal reaction process and thermodynamic characteristics in the preparation of hercynite were analyzed in this study ,and hercynite was synthesized with ferric bauxite/Al2 O3 powder ,Fe2 O3 powder and praphite powder/glucose by sintering reaction and molten‐salt menth‐od ,respectively .The products were analyzed by XRD ,SEM and optical microscopy .The results show that the hercynite synthesized by sintering reaction under N2 atmosphere has better crystal‐lization .Molten‐salt method can lower the synthesis temperature of hercynite significantly ,which provides a more moderate method for the industrial production of hercynite .Using ferric bauxite as raw material ,hercynite can be synthesized by sintering reaction at a lower cost .%研究分析了合成铁铝尖晶石的热历程及其热力学特征，并以Al2 O3粉、Fe2 O3粉／高铁铝土矿为原料，以石墨／葡萄糖为还原剂，分别采用烧结法和熔盐法合成了铁铝尖晶石，利用X RD、SEM 及光学显微镜对样品进行了表征。结果表明：在氮气气氛下以Al2 O3粉和Fe2 O3粉为原料采用烧结法合成的铁铝尖晶石结晶良好，采用熔盐法可以显著降低铁铝尖晶石的合成温度，为铁铝尖晶石的工业生产提供了一种较为温和的方法；采用高铁铝土矿为原料，通过氮气气氛下的烧结法可以较为廉价地合成铁铝尖晶石。