Enhancement of Reduction Rate of Iron Ore by Utilizing Iron Ore/Carbon Composite Consisting of Fine Iron Ore Particles and Highly Thermoplastic Carbon Material
Enhancement of Reduction Rate of Iron Ore by Utilizing Iron Ore/Carbon Composite Consisting of Fine Iron Ore Particles and Highly Thermoplastic Carbon Material
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DOI：
10.2355/isijinternational.51.1227
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发表时间：
2011
影响因子：
1.8
通讯作者：
M. Kawanari;Atsushi Matsumoto;Ryuichi Ashida;K. Miura
中科院分区：
文献类型：
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作者：
M. Kawanari;Atsushi Matsumoto;Ryuichi Ashida;K. Miura
降低蓄热区温度可以提高高炉炼铁的能量利用率。为此，在贫CO气氛中，直接还原反应速率或焦炭气化反应速率必须显著增加到低于1000°C。铁矿石/碳复合材料（IOC）是一种新型的提高铁矿石还原率的原料。本文通过制备一种由纳米Fe_2O_3颗粒（直径10-70 nm）和由热塑性树脂制备的碳材料组成的理想IOC样品来考察提高还原速率的可能性。IOC样品中的纳米尺寸的Fe 2 O3颗粒在惰性气氛中在低至650°C下在几分钟内令人惊讶地还原为Fe。这是通过增加Fe 2 O3颗粒和碳之间的界面面积以及通过在两者之间建立紧密接触来实现的。IOC样品中的碳也在CO2气氛中在低至750°C下在不到10分钟内完全气化。气化速率的显着提高被认为是实现的直接还原反应之一，Fe 3 O 4颗粒和碳之间的反应，通过原位XRD测量的帮助下，增强。这表明，还原反应速率和气化反应速率的提高是通过相同的机理实现的。这些新发现将为设计适用于高炉炼铁的IOC样品提供线索。
Decreasing the thermal reserve zone temperature is believed to increase the energy efficiency of blast furnace iron-making. To do so, either the direct reduction reaction rate or the coke gasification reaction rate must be significantly increased below 1000°C in CO-lean atmosphere. An iron ore/carbon composite (IOC) has been proposed as a new raw material that can enhance the reduction rate of iron ore. In this paper the possibility of the reduction rate enhancement was examined by preparing a kind of ideal IOC sample consisting of nano-sized Fe2O3 particles (10–70 nm in diameter) and a carbon material prepared from a thermoplastic resin. The nano-sized Fe2O3 particles in the IOC sample were surprisingly reduced to Fe in a few minutes at as low as 650°C in an inert atmosphere. This was realized by increasing the interfacial area between the Fe2O3 particles and carbon and by establishing intimate contact between the two. The carbon in the IOC sample was also completely gasified in less than 10 minutes at as low as 750°C in a CO2 atmosphere. The dramatic enhancement of the gasification rate was found to be realized by the enhancement of one of the direct reduction reactions, the reaction between Fe3O4 particles and carbon, by the aid of in-situ XRD measurement. This suggested that the enhancement of both the reduction reaction rate and the gasification reaction rate is realized by the same mechanism. These new findings will give a clue for designing IOC samples applicable to the blast furnace iron-making.