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Zheng, Heng
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Publications (7/7 displayed)
- 2024Optimizing methane plasma pyrolysis for instant hydrogen and high-quality carbon productioncitations
- 2023Evaluation of Slag Foaming Behavior Using Renewable Carbon Sources in Electric Arc Furnace-Based Steel Productioncitations
- 2023Phase Transition of Magnetite Ore Fines During Oxidation Probed by In Situ High-Temperature X-Ray Diffractioncitations
- 2023The Behavior of Phosphorus in the Hydrogen-Based Direct Reduction—Smelter Ironmaking Routecitations
- 2023The Behavior of Direct Reduced Iron in the Electric Arc Furnace Hotspotcitations
- 2022Long-Term Reoxidation of Hot Briquetted Iron in Various Prepared Climatic Conditionscitations
- 2022Surface Morphology and Structural Evolution of Magnetite-Based Iron Ore Fines During the Oxidationcitations
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article
The Behavior of Direct Reduced Iron in the Electric Arc Furnace Hotspot
Abstract
Hydrogen-based direct reduction is a promising technology for CO2 lean steelmaking. The electric arc furnace is the most relevant aggregate for processing direct reduced iron (DRI). As DRI is usually added into the arc, the behavior in this area is of great interest. A laboratory-scale hydrogen plasma smelting reduction (HPSR) reactor was used to analyze that under inert conditions. Four cases were compared: carbon-free and carbon-containing DRI from DR-grade pellets as well as fines from a fluidized bed reactor were melted batch-wise. A slag layer’s influence was investigated using DRI from the BF-grade pellets and the continuous addition of slag-forming oxides. While carbon-free materials show a porous structure with gangue entrapments, the carburized DRI forms a dense regulus with the oxides collected on top. The test with slag-forming oxides demonstrates the mixing effect of the arc’s electromagnetic forces. The cross-section shows a steel melt framed by a slag layer. These experiments match the past work in that carburized DRI is preferable, and material feed to the hotspot is critical for the EAF operation.