2010 O. J. P. Gonzalez Mathematical Modeling of the Melting Rate of Metallic Particles in the Electric Arc Furnace isijinternational.50.9

The melting process of direct reduced iron (DRI) is a critical aspect of its utilization in Electric Arc Furnaces (EAF), yet challenges remain in fully understanding the mechanisms involved. This study aims to elucidate the melting and dissolution phenomena of DRI within a multiphase system, including liquid slag, liquid steel, evolving gases, and solid particles. The methodology utilizes both experimental and mathematical modeling approaches, noting previous findings that outlined the influence of process variables on dissolution kinetics, such as particle size and thermal conductivity. The research discusses how the formation of a frozen shell around added materials affects melting time and rates. Results indicate that variations in stirring conditions and slag temperature significantly alter the characteristics of the melting process, demonstrating that larger particles require extended melt times while maintaining similar dissolution behavior to smaller particles. The findings contribute to the existing literature by providing a deeper understanding of the thermal dynamics of DRI melting, which is essential for optimizing EAF operations and enhancing product quality. Overall, this study highlights the complexity of melting DRI and the factors that influence its efficiency and effectiveness in steelmaking applications.