Abstract

Mill scale is treated as a waste product by the steel industry, so it is essential to recycle and reuse this waste for recovery of metallic iron and its single oxide derivative. Most of the study in the field of mill scale reduction focuses on the static mill scale reduction. Optimizing the process in dynamic conditions becomes more difficult because of the complexity involved inside the process. In the present method, mill scale having particle size ranges from 106 to 53 µm was converted to single-phase oxide Fe₂O₃ by blowing pure oxygen at 1100 °C and then it was subjected to a reducing atmosphere of 50% H₂ and 50% N₂ (1:1) at 875 ± 5 °C at a varying reactor angle from 2° to 5° and different mass flow rates varying from 0.037 to 0.148 kg/min. A generalized experimental model (GEM) has been formulated for the degree of reduction of oxide, which encompasses twelve parameters consisting of reactor design and process parameters. A Buckingham theorem was used to obtain dimensionless parameter for the degree of reduction, and a logical correlation using the proposed model has been established.

Graphical Abstract

中文翻译：

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工艺参数对氧化厂氧化皮逆流反应器还原的影响及其与数学模型的相互关系

摘要

钢铁工业将氧化皮作为废品处理，因此必须回收利用该废料以回收金属铁及其单一氧化物衍生物。减少轧机氧化皮领域的大多数研究都集中在静态轧机氧化皮降低上。由于过程内部涉及复杂性，因此在动态条件下优化过程变得更加困难。在本方法中，通过在1100℃下吹纯氧，将粒度范围为106至53μm的轧制氧化皮转变成单相氧化物Fe ₂ O ₃，然后使其经受50％H ₂的还原气氛和50％N ₂（1：1）在875±5°C下，反应器角度从2°到5°不等，质量流量从0.037到0.148 kg / min不等。已针对氧化物的还原程度制定了通用实验模型（GEM），该模型包含由反应器设计和工艺参数组成的十二个参数。利用白金汉定理获得了降阶程度的无量纲参数，并利用所提出的模型建立了逻辑相关性。

图形概要