Utilization of Ores with High Combined Water Content for Ore-carbon Composite and Iron Coke
Utilization of Ores with High Combined Water Content for Ore-carbon Composite and Iron Coke
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DOI：
10.2355/isijinternational.51.1220
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发表时间：
2011
影响因子：
1.8
通讯作者：
T. Murakami;E. Kasai
中科院分区：
文献类型：
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作者：
T. Murakami;E. Kasai
减少CO2排放和有效利用低品位铁资源是钢铁行业的重要任务。同时实现两者的方法之一是使用高反应性团块（例如铁矿石-碳复合物或铁焦炭，其中铁源是具有高结合水含量的矿石）来降低高炉中的热储备区温度。在这项研究中，使用高水含量的矿石，矿石粒度和煤-矿混合物中的比例对还原行为的影响进行了研究。研究了铁焦中矿石粒度对气化反应的影响。复合材料中矿石粒度的减小和煤矿混合比的增加降低了金属铁开始形成的温度。然而，与赤铁矿矿石相比，较弱的粒度和混合比的依赖性，获得由矿石制成的复合材料具有高的结合水含量。利用具有高结合水含量的矿石作为铁源是降低铁焦气化开始温度的有效方法。该温度比使用焦炭与赤铁矿石和仅使用焦炭时分别低约20 K和50 K。
Reduction of CO2 emissions and effective use of low-grade iron resources are very important tasks for the steel industry. One of the methods to simultaneously achieve both is to lower the thermal reserve zone temperature in the blast furnace using a high-reactivity agglomerate such as an iron ore–carbon composite or iron coke in which the iron source is an ore with high combined water content. In this study, using high water content ores, the effects of the ore particle size and coal–ore mixture ratio in a composite on the reduction behavior were investigated. The impact of the ore particle size in iron coke on the gasification behavior was also investigated. A decrease in the ore particle size in the composite and an increase in the coal–ore mixture ratio lowered the temperature at which metallic iron starts to form. However, compared with hematite ore, weaker particle size and mixture ratio dependencies were obtained for composites made from ore having high combined water content. The utilization of an ore with high combined water content as the iron source is an effective method for lowering the temperature at which the gasification of iron coke begins. This temperature is about 20 K and 50 K lower than that when using coke with hematite ore and using coke only, respectively.