Thermodynamic analysis of zinc ferrite (ZnFe₂O₄) formation inside the HIsarna off-gas system

Thermodynamic analysis of zinc ferrite (ZnFe₂O₄) formation inside the HIsarna off-gas system

Hosseini, A. (TU Delft Team Yongxiang Yang)
Moosavi-Khoonsari, Elmira (Tata Steel)
Meijer, Koen (Tata Steel)
Hage, Johannes (Tata Steel)
Peeters, Tim (Tata Steel)
Offerman, S.E. (TU Delft Team Erik Offerman)
Yang, Y. (TU Delft Team Yongxiang Yang)

2022

HIsarna reactor is characterized by a high raw materials versatility and is therefore attractive for processing secondary iron sources. Among the materials that can be recycled through HIsarna, zinc-bearing material has drawn a special attention. Based on the plant data, once dust-containing Zinc was injected into the main reactor, a final collected dust with a zinc content of 16% was achieved which opened up possibilities of higher enrichment for direct reuse in Zn smelting as a secondary source and an alternative for Zn ore (the primary source). However Zn vapor can react with iron oxide to form zinc ferrite (ZnFe₂O₄), which is an undesired product. Hence, the main focus of this study is to minimize the formation of ZnFe₂O using thermodynamic (FactSage) and computational fluid dynamic tools. After detecting regions with high potential of ZnFe₂O₄ formation, proper geometrical and operational modifications of the off-gas system is proposed to minimize the formation of zinc ferrite.

CO–H mixture combustion
dog leg
equilibrium graph
frog leg
HIsarna
Thermodynamic analysis
zinc ferrite formation

http://resolver.tudelft.nl/uuid:5de4c6b3-5f3b-43c5-9cc2-1a0f5fe89561

https://doi.org/10.1080/03019233.2022.2124491

0301-9233

Ironmaking & Steelmaking: processes, products and applications, 50 (2023) (5), 485-499

Institutional Repository

journal article

© 2022 A. Hosseini, Elmira Moosavi-Khoonsari, Koen Meijer, Johannes Hage, Tim Peeters, S.E. Offerman, Y. Yang