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Isothermal reduction of titanomagnetite concentrates containing coal

ISSN号：1674-4799
期刊名称：International Journal of Minerals Metallurgy and M
时间：2014.2
页码：131-137
分类：TQ424.25[化学工程] TD951.1[矿业工程—选矿]
作者机构：[1]College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China, [2]Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
相关基金：This work was financially supported by the Major Pro- gram of National Natural Science Foundation of China （Nos 51090383 and 51090382） and the Scholarship Award for Excellent Doctoral Student granted by the Ministry of Education of China （No. 0903005109081-8）.
相关项目：高温溶胶生成、演变的物理化学规律及在冶金过程中的作用

作者： Hu, Tu|Lu, Xue-wei|Bai, Chen-guang|Qiu, Gui-bao|

关键词：磁铁矿精矿, 含钛, 煤炭, 表观活化能, 温降, 还原反应, 温度范围, 反应速率, titanomagnetite, carbothermal reduction, thermogravimetric analysis, kinetics

中文摘要：

Panzhihua titanomagnetite 的等温的减小专注(PTC ) 在氩空气下面的煤饼包含煤被 thermogravimetry 在 12501350 的温度范围以内在一个电的抵抗炉子调查吗？？

英文摘要：

The isothermal reduction of the Panzhihua titanomagnetite concentrates （PTC） briquette containing coal under argon atmosphere was investigated by thermogravimetry in an electric resistance furnace within the temperature range of 1250-1350°C. The samples reduced in argon at 1350°C for different time were examined by X-ray diffraction （XRD） analysis. Model-fitting and model-free methods were used to evaluate the apparent activation energy of the reduction reaction. It is found that the reduction rate is very fast at the early stage, and then, at a later stage, the reduction rate becomes slow and decreases gradually to the end of the reduction. It is also observed that the reduction of PTC by coal depends greatly on the temperature. At high temperatures, the reduction degree reaches high values faster and the final value achieved is higher than at low temperatures. The final phase composition of the reduced PTC-coal briquette consists in iron and fer-rous-pseudobrookite （FeTi2O5）, while Fe2.75Ti0.25O4, Fe2.5Ti0.5O4, Fe2.25Ti0.75O4, ilmenite （FeTiO3） and wustite （FeO） are intermediate products. The reaction rate is controlled by the phase boundary reaction for reduction degree less than 0.2 with an apparent activation energy of about 68 kJ·mol-1 and by three-dimensional diffusion for reduction degree greater than 0.75 with an apparent activation energy of about 134 kJ·mol-1. For the reduction degree in the range of 0.2-0.75, the reaction rate is under mixed control, and the activation energy increases with the increase of the reduction degree.

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