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对碳热还原铝土矿尾矿可能发生的反应进行了热力学分析。利用TG、XRD、XRF、SEM-EDS等技术研究了产物的生成过程、Fe2O3对反应的影响以及产物的物相组成。结果表明,Fe2O3可以降低反应温度和S iC的生成率,提高A l2O3的还原率。碳热还原铝土矿尾矿合适的反应温度为1 900℃。整个还原过程可分为4个阶段,其中以碳化物的生成与分解阶段为主。产物中除含有铝硅铁相生成外,还有残留的A l2O3、单质铝和碳化物相存在。
Thermodynamic analysis of the reaction that may occur in the carbothermal reduction of bauxite tailing is carried out. The formation process of the product, the effect of Fe2O3 on the reaction and the phase composition of the product were studied by TG, XRD, XRF and SEM-EDS. The results show that Fe2O3 can reduce the reaction temperature and the formation rate of S iC and increase the reduction rate of A l2O3. The suitable reaction temperature of carbothermal reduction bauxite tailing is 1 900 ℃. The entire reduction process can be divided into four stages, of which the formation and decomposition of carbide-based stage. In addition to the product containing aluminum ferrosilicon phase, there are residual A l2O3, aluminum and carbide phases exist.