Reduction of Panzhihua titanium-bearing oxidized pellets by CO-N_2-H_2 gas

作     者：张建良 郑常乐 汤云腾 柴轶凡 ZHANG Jian-liang;ZHENG Chang-le;TANG Yun-teng;CHAI Yi-fan

作者机构：School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2016年第23卷第5期

页      面：1015-1022页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：Project (51134008) supported by the National Natural Science Foundation of China Project (2012CB720401) supported by the National Basic Research Program of China 

主　　题：titanomagnetite pellet carbon monoxide hydrogen reduction blast furnace 

摘      要：The effect of H_2 gas content on the reduction of Panzhihua titanomagnetite concentrate pellets by carbon monoxide was investigated by isothermal reduction experiment using CO-N_2-H_2 gas mixtures in a vertical electric resistance *** morphology and phase transformation of reduced samples obtained were detected by scanning electron microscopy,energy disperse spectroscopy analysis and X-ray diffractometry *** results show that increasing H_2 content will enhance the initial stage of reduction rate *** are two reasons responsible for this effect,one is that H_2 accelerates the chemical reaction,and the other is that the addition of H_2 gas can improve the porosity of pellet *** is noteworthy that this effect is more obvious when the reduction temperature reaches 1473 K with sticking phenomenon *** are no crystalline phases which can be found such as ulvospinle,ilmenite,ferrous-pseudobrookite and any titanium oxide except titanomagnetite(TTM).The reduction progress is suggested as follows:1) Fe_2O_3→Fe_3O_4→FeO→Fe;2) Fe_2TiO_5→Fe_2TiO_4+Fe_3O_4→*** Al migrates and gets enriched in high titanium content iron ores,and eventually Al to Ti molar ratio is 1:*** is likely to dissolve in titanium iron oxides to form a kind of composite iron compound,which results in the restrain of reduction.