Interface Behavior and Interaction Mechanism between Vanadium-Titanium Magnetite Carbon Composite Briquette and Sinter in Softening-Melting-Dripping Process

Zhao, Wei; Chu, Mansheng; Guo, Hongwei; Liu, Zhenggen; Yan, Biao

doi:10.2355/isijinternational.isijint-2020-309

Cited by 6 publications

(5 citation statements)

References 38 publications

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“…6). 38,39) In stage Ⅱ of the pressure drop curve, the amount of dropping slag decreases with the increasing N 2 concentration, that is, the amount of residual slag in the crucible is increased (Fig. 4); and with the increase of temperature, the Ti(C, N) produced by the reaction of residual slag and coke increases.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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In COREX process, the top gas recycling (TGR) is an effective recovery and utilization technology for the high-quality gas by-produced from the melter gasifier, which can reduce its fuel consumption and emissions, and is of great significance to low carbon ironmaking. However, low concentration N 2 is contained in the top gas, it is unfavorable to the smelting of V-Ti bearing burden because the high temperature solid solution Ti(C, N) is formed in the semi-coke bed and deteriorates the burden permeability of the melter gasifier. The effect of N 2 concentration (0-10 vol%) on the softening, melting and dropping behavior of V-Ti bearing burden is investigated under simulated COREX conditions. Results show that the increasing N 2 concentration will promote the formation of Ti(C, N), increase the slag viscosity and its wettability to coke, greatly increase the burden dropping temperature, which reduces the slag dropping rate from 68.2% to 18.8%. In addition, slag foaming is caused and the gas permeability of V-Ti bearing burden is deteriorated. The vanadium contents of dropping iron and residual iron are decreased from 0.051 wt% and 0.166 wt% to 0.043 wt% and 0.161 wt%, when the N 2 concentration in reducing gas changes from 0 vol% to 10 vol%. If the pressure drop needs to be controlled below 20 kPa, the N 2 concentration in the reducing gas should not exceed 5 vol%, that is, the top gas injection volume should be less than 60%.

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Section: Discussionmentioning

confidence: 99%

“…4); and with the increase of temperature, the Ti(C, N) produced by the reaction of residual slag and coke increases. Eventually, they leads to the slag thickening and foaming, 38,39) resulting in a sharp rise in pressure drop curve, and the deterioration of the gas permeability of the V-Ti bearing burden (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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“…The basicity of vanadium-titanium sinter directly affects the formation, position, thickness, permeability, and heat exchange of the cohesive zone (softening zone) in the blast furnace. It also influences the formation and nature of the initial slag in the blast furnace, which in turn affects the slagging system and thermal system of the furnace [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Vanadium–Titanium Sinter Basicity on Cohesive Dripping Properties of Blast Furnace Comprehensive Burden

Ning,

Wang,

Yang

2024

Minerals

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Vanadium–titanium ore possesses significant mining and utilization value. The basicity of vanadium–titanium sinter has a direct impact on the formation, location, thickness, permeability, and heat exchange of the cohesive zone in the blast furnace. This paper investigated the influence of increasing the basicity of the sinter on the comprehensive burden’s cohesive dripping properties in the blast furnace, while keeping the final slag basicity constant. This study was conducted through cohesive dripping property experiments. The findings indicated that as the sinter basicity in the comprehensive burden structure increased and the corresponding increase in the proportion of pellets occurred, the softening performance of the comprehensive burden improved, the cohesive zone became thinner, the lower edge of the cohesive zone shifted upward, and the softening melting properties became better in general. With an increase in the sinter basicity, the dripping difference pressure of the comprehensive burden decreased, and the dripping rate firstly increased and then decreased. An increase in the sinter basicity of the comprehensive burden structure promoted V reduction, and the V element yield and Cr element yield of the sinter were both increased; the optimal sinter basicity was 2.5, and the corresponding pellet proportion was 42%.

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“…The cohesive zone not only governs the secondary distribution of the gas flow and determines the separation of slag and iron 1-4), but is also the area of greatest pressure drop within the blast furnace 5-7). Depending on the state of the burden, the cohesive zone is separated into softening zone and melting zone [8][9][10][11]. The initial formation of the liquid phase in slag affects the upper edge of softening zone 12), and the properties of the slag phase determines the pressure drop of melting zone 13).…”

Section: Introductionmentioning

confidence: 99%

Relationship between Slag Phase and Softening & Melting Properties of Cohesive Zone

Fan,

Zhang

2023

ISIJ Int.

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In this paper, Softening & Melting experiments with different charge ratios are carried out and compared with typical slag phase properties. The relationship between the charge ratio and the softening & melting properties is non-linear correlation. The liquid phase generation process of the slag corresponds to the softening zone and the viscosity change process of the slag phase after the liquid phase is fully generated corresponds to the melting zone. In the softening interval the properties of FeO-CaO-SiO 2 system play a dominant role, while in the melting interval the properties of FeO-CaO-Al 2 O 3 -SiO 2 system play a dominant role. This provides ideas for the study of the limiting links in the soft fusion zone of complex systems.

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Interface Behavior and Interaction Mechanism between Vanadium-Titanium Magnetite Carbon Composite Briquette and Sinter in Softening-Melting-Dripping Process

Cited by 6 publications

References 38 publications

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Influence of Vanadium–Titanium Sinter Basicity on Cohesive Dripping Properties of Blast Furnace Comprehensive Burden

Relationship between Slag Phase and Softening & Melting Properties of Cohesive Zone

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