铝热还原制备高钛铁的热力学和动力学

Thermodynamics and kinetics of preparation of high titanium ferroalloy by thermite reaction

对金红石、钛铁矿、铝粉体系热力学进行了计算。结果表明:以Al、Ca、Mg、Ba、Li、Na等金属做还原剂是可行的,标态下反应的吉布斯自由能变化都很负,可以选用这些金属的合金作为复合还原剂。DSC动力学分析结果表明:Al还原TiO_2、Fe_2O_3在1000℃左右开始进行,而Al还原TiO_2、Fe_2O体系中添加CaO,反应滞后,在1236℃左右发生反应。

The thermodynamic of the system of futile, ilmenite and aluminum powder was calculated. The results show that Al, Ca, Mg, Ba, Li and Na can be used as reducing agent. The Gibbs free energy changes have very high negative value, so all of the metals can be used as composite reducing agent. The dynamic analysis by DSC shows that the reaction of reducing TiO2, Fe2O3 by Al occurs at 1 000 ℃, and the initial reaction temperature delays to 1236 ℃ when adding CaO.