Carbothermic Reduction in the Combustion Bed Packed with Composite Pellets of Iron Oxide and Coal
Carbothermic Reduction in the Combustion Bed Packed with Composite Pellets of Iron Oxide and Coal
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DOI：
10.2355/isijinternational.40.842
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发表时间：
2000-09
影响因子：
1.8
通讯作者：
E. Kasai;Takaya Kitajima;Takazo Kawaguchi
中科院分区：
文献类型：
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作者：
E. Kasai;Takaya Kitajima;Takazo Kawaguchi
在燃烧床中使用铁矿石和煤粉的复合球团，对新的还原概念的工艺可行性进行了实验研究。实现这一概念的关键是找到一种防止在此过程中形成的金属铁再氧化的方法。为了检验最佳措施，首先使用单一复合片进行了还原实验。在片剂上包覆含CaO材料，即Ca(OH) 2 或CaCO 3 粉末，对高温下的再氧化有一定的抑制作用。在此基础上，在不同条件下在填充有复合颗粒的燃烧床中进行了还原实验。未能找到适当的条件来完全防止金属铁的再氧化。然而，通过将含 CaO 的材料混合到混合物中或将其涂覆在复合颗粒周围，可显着抑制再氧化。获得的最大还原率和金属化率分别为72%和64%。这表明所提出的工艺有可能为随后的还原/熔化工艺（例如高炉）产生部分减少的铁负荷。
Process feasibility has been experimentally studied on a new reduction concept using the composite pellets of iron ore and coal powders in their combustion bed. A key to realize this concept will be a method to prevent reoxidation of metallic iron formed during the process. To examine the optimum measure, reduction experiment using a single composite tablet was first conducted. Coating the tablet with a CaO bearing material, i.e., Ca(OH) 2 or CaCO 3 powder, gives a certain suppression effect on the reoxidation at high temperature. On the basis of this result, reduction experiment in the combustion bed packed with the composite pellets were carried out under various conditions. An proper condition could not be found to perfectly prevent the reoxidation of metallic iron. However, the reoxidation was significantly suppressed by the admixing of CaO bearing material to the mixture or the coating it around the composite pellets. The maximum reduction and metallization degrees obtained were 72 and 64%, respectively. It suggests that the proposed process has a potential to produce partially-reduced iron burdens to a subsequent reduction/melting process such as the blast furnace.