摘要
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。
The thermodynamic analysis on the carbotherma] reduction of bauxite tail was carried out. The carbother- mal reduction process, effect of Fe2O3 addition on the reduction reaction and the composition of products were studied by various methods such as TG, XRD, XRF, SEM coupled with EDS. It was found that Fe2O3 could not only reduce the reaction temperature and the yield of SiC, but also improve the reduction ratio of Al2O3. The proper temperature was 1 900 ℃ in the carbothermal reduction of bauxite tail. The carbothermal reduction process could be divided into 4 stages, and the key stage was the formation and decomposition of carbides stage. Besides Al - Si - Fe phases, there were residual Al2O3 and carbides phases in the products.
出处
《有色矿冶》
2010年第1期38-43,共6页
Non-Ferrous Mining and Metallurgy
基金
国家高科技发展计划(863)基金资助项目(编号:2007AA06Z116)
关键词
铝土矿尾矿
碳热还原
铝硅合金
热力学分析
bauxite tail
carbothermal reduction
Al -Si alloy
thermodynamic analysis
作者简介
作者简介：杨栋（1981-），男，陕西高陵人，博士研究生，主要研究方向为碳热法制取铝硅合金。
