Enhancement of Reduction Rate of Iron Ore by Utilizing Low Grade Iron Ore and Brown Coal Derived Carbonaceous Materials
Enhancement of Reduction Rate of Iron Ore by Utilizing Low Grade Iron Ore and Brown Coal Derived Carbonaceous Materials
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DOI：
10.2355/isijinternational.51.1234
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发表时间：
2011
影响因子：
1.8
通讯作者：
K. Miura;Keisuke Miyabayashi;M. Kawanari;Ryuichi Ashida
中科院分区：
文献类型：
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作者：
K. Miura;Keisuke Miyabayashi;M. Kawanari;Ryuichi Ashida
当制备铁矿石/碳复合材料（IOC）以最大化界面面积并实现铁矿石颗粒与碳之间的紧密接触时，可以显着提高铁矿石的还原率。本文提出了在实际高炉操作中实现这一概念的想法。选择含有大量针铁矿FeOOH的低品位铁矿石作为铁矿石，并选择褐煤衍生物作为热塑性碳质材料来制备IOC样品。针铁矿 (FeOOH) 具有通过与 OH 基团相连的氢键结合的层状结构。当 FeOOH 加热至 250 至 300°C 时，OH 基团以 H2O 的形式被去除，在 20 nm 厚的 Fe2O3 层之间留下 0.8 nm 宽的平坦孔隙空间。然而，在超过 300°C 的温度下，Fe2O3 层的烧结会封闭孔隙空间。提出的想法是在孔隙空间打开的情况下将热塑性碳质材料插入到0.8nm宽的孔隙空间中，并在500℃以下的孔隙空间中将其碳化形成碳。该IOC有望实现Fe2O3层与碳之间的紧密接触，并显着提高Fe2O3的还原率。通过使用试剂级 FeOOH 和热塑性树脂制备 IOC 样品，验证了这一想法的有效性。结果表明，IOC 样品是由低品位铁矿石 SF 制备的。罗布河和从褐煤中提取的热塑性提取物可以实际实现这个想法。
The reduction rate of iron ore can be enhanced dramatically when iron ore/carbon composites (IOC) are prepared so as to maximize the interfacial area and to realize intimate contact between iron ore particles and carbon. An idea realizing this concept in practical blast furnace operation was proposed in this paper. Low grade iron ore that contains a large amount of goethite, FeOOH, was chosen as an iron ore, and brown coal derivative was chosen as a thermoplastic carbonaceous material for preparing IOC sample. Goethite, FeOOH, has layered structures combined by hydrogen bonds associated with OH groups. When FeOOH is heated up to 250 to 300°C, the OH groups are removed as H2O, leaving flat pore spaces of 0.8 nm wide between 20 nm thick Fe2O3 layers. The pore spaces are, however, closed over 300°C by the sintering of the Fe2O3 layers. The idea proposed is to insert the thermoplastic carbonaceous material into the pore space of 0.8 nm wide while the pore spaces are opened and to carbonize it to form carbon in the pore space below 500°C. This IOC is expected to realize intimate contact between the Fe2O3 layers and the carbon, and to enhance the reduction rate of the Fe2O3 dramatically. The validity of this idea was verified by preparing IOC samples using reagent grade FeOOH and a thermoplastic resin. Then it was shown that the IOC sample prepared from a low grade iron ore, SF. Robe River, and a thermoplastic extract deriving from a brown coal can realize the idea practically.