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Metallurgical and Materials Transactions B

, Volume 50, Issue 6, pp 2681–2693 | Cite as

A Thermodynamic Model Toward the Comprehension of Ferrous Burden Softening and Melting Using FactSage Macro-Processing

  • Ismael Vemdrame FloresEmail author
  • Aline Lima da Silva
  • Nestor Cezar Heck
  • Maurício Covcevich Bagatini
Article
  • 108 Downloads

Abstract

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.

Notes

Acknowledgments

The authors express their gratitude to CAPES-PROEX, CNPq, and FAPEMIG for stimulating and supporting research.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Ismael Vemdrame Flores
    • 1
    Email author
  • Aline Lima da Silva
    • 2
  • Nestor Cezar Heck
    • 3
  • Maurício Covcevich Bagatini
    • 1
  1. 1.Ironmaking Processes Laboratory (LPS)Federal University of Minas Gerais (UFMG)Belo HorizonteBrazil
  2. 2.Metallurgical and Materials DepartmentFederal University of Minas Gerais (UFMG)Belo HorizonteBrazil
  3. 3.Computational Thermodynamics for Metallurgy and Materials (NTCm Group)Federal University of Rio Grande do Sul (UFRGS)Porto AlegreBrazil

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