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Behavior of direct reduced iron and hot briquetted iron in the upper blast furnace shaft: Part II. A model of oxidation

机译：高炉竖炉中直接还原铁和热压块铁的行为：第二部分。氧化模型

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摘要

The high-temperature properties of the ferrous burden in the cohesive zone of the blast furnace (BF) are a function of its history in the upper shaft. It is considered that charging direct reduced iron (DRI) and hot briquetted iron (HBI) into the BF increases its efficiency and productivity. However, oxidation of DRI and HBI can occur in the low-temperature zone in the BF, which may affect their softening and melting properties. This work was designed to estimate the oxidation degree of DRI/HBI in the upper BF shaft. In this article, a model of oxidation was developed, which predicted that DRI and HBI can be oxidized up to 10 and 2 pct, respectively. The model was then put forth to a laboratory-simulated test and industrial simulated blast furnace (SBF) test for its verification. The results of SBF tests indicated that the oxidation of DRI/HBI occurs in a temperature range of 700 °C to 950 °C with the gas compositions used for the tests. The morphology of iron in DRI is expected to exhibit Fe-FeO-Fe layers in varying thickness at the beginning of the cohesive zone. The oxidation in HBI briquettes is primarily limited to its external surface. These results indicate that the impact of oxidation of DRI/HBI on the cohesive zone will not be significant.
机译：高炉（BF）粘结区的含铁物料的高温特性是其在上竖井中的历史的函数。据认为，将直接还原铁（DRI）和热压块铁（HBI）装入高炉会提高其效率和生产率。但是，DRI和HBI的氧化会在高炉的低温区发生，这可能会影响其软化和熔融性能。设计这项工作是为了估计高炉竖井中DRI / HBI的氧化程度。在本文中，开发了氧化模型，该模型预测DRI和HBI分别可以被氧化到10 pct和2 pct。然后将该模型进行实验室模拟测试和工业模拟高炉（SBF）测试以进行验证。 SBF测试的结果表明，在用于测试的气体成分的情况下，DRI / HBI的氧化在700℃至950℃的温度范围内发生。预期DRI中铁的形态会在粘结区开始时以变化的厚度显示Fe-FeO-Fe层。 HBI型煤中的氧化主要限于其外表面。这些结果表明DRI / HBI的氧化对内聚区的影响将不显着。

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  • 来源
    《Metallurgical and Materials Transactions B》 |2006年第5期|727-732|共6页
  • 作者

    P. Kaushik; R. J. Fruehan;

  • 作者单位

    Steelmaking and Refractories Process Research Mittal Steel USA RampampD Centre 46312 E. Chicago IN;

    the Materials Science and Engineering Department Carnegie Mellon University 15213 Pittsburgh PA;

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