Experimental Study on Oxidation-reduction of Panzhihua Low Silicon Ilmenite Concentrate

With Panzhihua low silicon ilmenite concentrate as the object,the effects of oxidation temperature and time on the phase structure and reduction properties of ilmenite were studied,and the weight loss rate as well as the metallization rate in reduction of the pre-oxidized ilmenite at different temperatures and time were analyzed.The results show that the oxidation of ilmenite concentrate can be completed in a short time.With the increase of oxidation temperature,the main phase change process of ilmenite concentrate is FeTiO₃→Fe₂O₃+TiO₂→Fe₂TiO₅+Fe₂O₃+TiO₂.The reduction temperature and time have a great influence on the metallization rate of ilmenite,and the effects are not obvious with the reduction temperature and time more than 1 300 ℃ and 8 h,respectively.The microstructure analysis shows that the aggregation of metallic iron occurs at high reduction temperatures,forming spherical and rod-shaped metallic iron particles with a size of about 10 μm.