Study on the influence of highly oxygen enrichment and H<sub>2</sub>-rich oxygen blast furnace atmospheres on softening-melting behaviors of vanadium titanomagnetite mixed burden

CHEN Mao; CHEN Buxin; MA Kaihui; TANG Wenbo; LIU Lingling; HU Meilong

doi:10.7513/j.issn.1004-7638.2025.03.017

Volume 46 Issue 3

Jun. 2025

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2025 > 46(3): 112-121

CHEN Mao, CHEN Buxin, MA Kaihui, TANG Wenbo, LIU Lingling, HU Meilong. Study on the influence of highly oxygen enrichment and H2-rich oxygen blast furnace atmospheres on softening-melting behaviors of vanadium titanomagnetite mixed burden[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 112-121. doi: 10.7513/j.issn.1004-7638.2025.03.017

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CHEN Mao, CHEN Buxin, MA Kaihui, TANG Wenbo, LIU Lingling, HU Meilong. Study on the influence of highly oxygen enrichment and H₂-rich oxygen blast furnace atmospheres on softening-melting behaviors of vanadium titanomagnetite mixed burden[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 112-121. doi: 10.7513/j.issn.1004-7638.2025.03.017

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Study on the influence of highly oxygen enrichment and H₂-rich oxygen blast furnace atmospheres on softening-melting behaviors of vanadium titanomagnetite mixed burden

doi: 10.7513/j.issn.1004-7638.2025.03.017

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
2.
School of Materials Science and Engineering, Chongqing University, Chongqing 400040, China

Received Date: 2025-02-26
Publish Date: 2025-06-30

Abstract

Abstract

This study investigates the effects of oxygen-enriched, oxygen blast furnace, and H₂-rich oxygen blast furnace atmospheres on the softening-melting behaviors, permeabilities, and gas utilization efficiency of vanadium titanomagnetite mixed burden. The results indicate that under oxygen-rich blast furnace atmosphere, the softening start temperature of furnace burden decreases, while the softening end temperature, melting start temperature, and dripping temperature increase. Consequently, both the softening and melting intervals become widened. However, the permeabilities and total reduction gas utilization efficiency decline. Under the H₂-rich oxygen blast furnace atmosphere, the introduction of H₂ leads to an increase in the softening start temperature, softening end temperature, and melting start temperature. Additionally, the softening interval expands, while the melting interval narrows, resulting in the improved gas permeability and enhanced H₂ utilization efficiency. Further investigation reveals that variations in the reducing gas compositions significantly influence the chemical compositions of both slags and hot metals. Under the oxygen-enriched atmosphere, the Ti(C,N) content in slag decreases markedly, whereas under fully oxygen-enriched, H₂-rich conditions, the TiC content in the slag, as well as [Si], [V] and [Ti] concentrations in hot metal, increase substantially. This study provides a theoretical basis for green low-carbon technologies in vanadium titanomagnetite smelting, and offers important experimental support for improving smelting efficiency and reducing carbon emissions.
- vanadium titanomagnetite,
- oxygen-enriched atmosphere,
- H₂-rich oxygen blast furnace,
- softening-melting,
- gas utilization rate

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