氧化铝真空碳热还原-氯化工艺中二氧化钛的行为分析

摘要

Behaviors of TiO2 in the alumina carbothermic reduction and chlorination process in vacuum at different temperatures were investigated experimentally by means of XRD,SEM and EDS.In the preparation of materials,the molar ratio of Al2O3 to C was 1:4,and 10％ TiO2 and excess AlCl3 were added.The results show that TiC is produced by C and TiO2 after TiO2 transforms from anatase into futile gradually.In the temperature range of 1 763-1 783 K,the compounds of Ti and Al are not found in slags and condensate.The purity of alumimun reaches 98.35％,and TiO2 does not participate in alumina carbothermic reduction process and chlorination process in vacuum.%在不同温度下氧化铝真空碳热还原和氯化反应的过程中,利用XRD、SEM和EDS检测手段分析TiO2的行为.在制备材料时,Al2O3和C的摩尔比为1∶4,并添加10％ TiO2和过量的AlCl3.结果表明,TiO2从锐钛矿型转化为金红石型后与C反应生成TiC.在1 763-1 783 K的温度区间,在残渣和冷凝物中没有发现Ti和Al的化合物.生成铝的纯度达到98.35％,且TiO2不参与氧化铝真空碳热还原和氯化过程.