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Smelting Reduction Studies: Scope and Limitations

机译：冶炼减少研究：范围和限制

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It is well accepted that the blast furnace will continue as the main route for iron-making for many more years. However, its limitations have motivated researchers to look for alternative routes, particularly, those where non-coking coal is used for liquid iron production. Smelting reduction (SR), where coal and oxygen are used to produce liquid iron and power is now receiving serious attention. Several smelting reduction reactors are now operating in pilot plant scale and one or two have reached commercial status. This paper presents a brief review of the scope and limitations of laboratory smelting reduction studies reported by various workers in the literature. Importance of different factors, eg types of slag melting systems, energy consumption, nature of raw materials, reductant, slag foaming, reaction kinetics, etc are briefly discussed. In SR technologies, substantial reduction of iron oxide takes place in molten slag phase and this results in generation of large amounts of gases in the reactor. Therefore, slag foaming and kinetics are two important aspects. Some results of an investigation carried out recently in this laboratory are also presented. The work has been carried out using 5 - 60 per cent FeO in slag in a 35 kW capacity plasma reactor. The reduction is carried out using solid carbon as reductant, carbon being drawn from the graphite crucible only. A few experimental data on reduction by coal and pig iron are also reported. Included is a special discussion on uncertainties present in a study of this type. The paper also presents some other studies of industrial relevance which exploit iron oxide reduction in the slag phase.
机译：众所周知，高炉将继续作为铁制剂多年的主要途径。然而，它的局限性具有激励的研究人员来寻找替代路线，特别是那些非焦煤用于液体铁生产的途径。冶炼减少（SR），其中煤和氧气用于生产液体铁，力量现在受到严重关注。几个冶炼还原反应器现在正在进行试点植物规模，一两个达到商业地位。本文介绍了各种工人在文献中报告的实验室冶炼减少研究的范围和限制的简要述评。简要讨论了不同因素的重要性，例如炉渣熔化系统，能耗，原料的性质，还原剂，渣发泡，反应动力学等。在SR技术中，在熔融渣阶段进行大量减少氧化铁，这导致在反应器中产生大量气体。因此，炉渣发泡和动力学是两个重要方面。还提出了最近在该实验室进行的调查结果。在35 kW容量等离子体反应器中使用5-60％的Feo进行了该工作。使用固体碳作为还原剂，从石墨坩埚中抽出的固体碳进行。还报道了一些关于煤和猪铁还原的实验数据。包括关于对这种类型的研究中存在的不确定性的特别讨论。本文还介绍了对氧化氧化铁阶段的氧化铁阶段氧化铁减少的其他一些研究。

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