Kinetic analysis of the iron oxide reduction using hydrogen-carbon monoxide mixtures as reducing agent
Kinetic analysis of the iron oxide reduction using hydrogen-carbon monoxide mixtures as reducing agent
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DOI：
10.2355/isijinternational.45.1255
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Manrique, M
中科院分区：
文献类型：
--
作者：
Bonalde, A;Henriquez, A;Manrique, M
用“颗粒模型”描述了以氢-一氧化碳混合物为还原剂还原赤铁矿球团的动力学。该模型以球团矿的粒度和孔隙率为主要结构参数，直接影响赤铁矿球团矿还原过程的动力学。将模型的预测值与实验结果进行了比较。使用氢气、一氧化碳和Midrex气体在850摄氏度下还原烧制的赤铁矿球团。减重技术用于跟踪减重过程。氢气或一氧化碳还原氧化铁球团是一个混合控制系统，在还原的第一阶段，化学反应和内部气体扩散是相互竞争的过程，而最后阶段，内部气体扩散成为控制步骤。用Midrex气体还原氧化铁球团是一个贯穿整个还原过程的混合控制系统。
The kinetics of the reduction of hematite pellets using hydrogen-carbon monoxide mixtures as reducing agent was described by using the "grain model". This model involves the particle size and the porosity of the pellet as main structural parameters which affect directly the kinetics of the hematite pellets during the reduction process. The predictions of the model were compared with the experimental results. Fired hematite pellets were reduced at 850 degrees C using hydrogen, carbon monoxide and Midrex gas. The weight loss technique was used to follow the reduction process. The reduction of iron oxide pellets using hydrogen or carbon monoxide is a mixed controlled system, where chemical reaction and internal gas diffusion are competing processes during the first stage of the reduction, while internal gas diffusion becomes controlling step at the last stage of the process. The reduction of iron oxide pellets using Midrex gas is a mixed controlled system throughout the whole reduction process.