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A Thermodynamic Model Toward the Comprehension of Ferrous Burden Softening and Melting Using FactSage Macro-Processing
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2019-09-17 , DOI: 10.1007/s11663-019-01684-z
Ismael Vemdrame Flores , Aline Lima da Silva , Nestor Cezar Heck , Maurício Covcevich Bagatini

The softening and melting properties of iron-bearing materials play a decisive role in the formation of the cohesive zone, which greatly affects blast furnace gas flow distribution and heat-transfer efficiency. To improve the understanding regarding the evolution of condensed phases during reduction, softening, and melting, a thermodynamic model has been developed using FactSage™ thermodynamic software and macro-processing. The model was constructed using a series of equilibrium stages and splitters to determine flow directions of streams and to consider kinetic inhibitions. For all iron-bearing materials studied, the methodology proposed for modeling was capable of obtaining reduction degrees in very good agreement to its experimental data. The evolution of solid phases was qualitatively comparable to the available literature, with Fayalite, Kirschsteinite, Melilite, and FeO as the main solid phases in equilibrium before slag formation. The comparison between the profiles of the calculated slag mass fraction and the experimental pressure drop showed a close relation between these properties. Moreover, the level of heterogeneity of each raw material may play a significant role in the interpretation of its results.

中文翻译:

使用 FactSage 宏观处理理解铁料软化和熔化的热力学模型

含铁材料的软化和熔化性能对粘结带的形成起着决定性作用,极大地影响高炉气流分布和传热效率。为了提高对还原、软化和熔化过程中凝聚相演变的理解,使用 FactSage™ 热力学软件和宏观处理开发了一个热力学模型。该模型是使用一系列平衡阶段和分流器构建的,以确定流的流动方向并考虑动力学抑制。对于所研究的所有含铁材料,建议的建模方法能够获得与其实验数据非常一致的还原度。固相的演变与现有文献在质量上具有可比性,Fayalite、Kirschsteinite、Melilite 和 FeO 作为炉渣形成前平衡中的主要固相。计算出的渣质量分数曲线与实验压降之间的比较表明这些特性之间存在密切关系。此外,每种原材料的异质性水平可能对其结果的解释起到重要作用。
更新日期:2019-09-17
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