Phase transformation behavior of titanium during carbothermic reduction of titanomagnetite ironsand

作     者：Yi-ran Liu Jian-liang Zhang Zheng-jian Liu Xiang-dong Xing 

作者机构：School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Metallurgical Engineering Xi'an University of Architecture and Technology 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2016年第23卷第7期

页      面：760-768页

核心收录：

学科分类：080602[工学-钢铁冶金] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0806[工学-冶金工程] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by National Basic Research Program of China(No.2012CB720400) the National Natural Science Foundation of China(No.51504216) 

主　　题：titanomagnetite carbothermic reduction apparent activation energy phase transformation 

摘      要：The reduction of titanomagnetite（TTM） ironsand, which contains 11.41wt% TiO_2 and 55.63wt% total Fe, by graphite was performed using a thermogravimetric analysis system under an argon gas atmosphere at 1423–1623 K. The behavior and effects of titanium in TTM ironsand during the reduction process were investigated by means of thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. During the reduction procedure, the titanium concentrated in the slag phase, where the phase transformation followed this sequence： Fe O ＋ FeTiO_3 → Fe_2 TiO_4 → FeTiO_3 → FeTi_2O_5 → TiO_2. The calculated results for the reduction kinetics showed that the carbothermic reduction was controlled by the diffusion of ions through the product layer. Furthermore, the apparent activation energy was 170.35 k J·mol^（-1）.