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化工进展  2015 

含煤球团直接还原热失重及动力学分析

DOI: 10.16085/j.issn.1000-6613.2015.03.017, PP. 701-704

Keywords: 含煤球团,直接还原,扩散,气化,动力学模型

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Abstract:

随着电炉炼钢的快速发展,作为其原料的直接还原铁的需求量日益增大,对直接还原特性和机理的研究变得越来越迫切,过去的研究主要集中在工艺条件和节能减排方面,对反应控速模型的比较相对较少。本文在950~1100℃的N2气氛下,研究了还原温度对含煤球团还原速率的影响,并结合XRD技术对还原产物的物相转换进行了分析。同时基于热重实验,应用不同控速模型方程计算了直接还原过程反应动力学参数,并与实验结果进行了对比。结果表明,温度对还原过程起着至关重要的作用,Fe3O4还原生成FeO在950℃以下已经开始了,FeO的还原主要发生在1000℃以上,从950~1100℃还原速率迅速增加。通过模型对比,认为还原过程由三维气相扩散控制。

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