Effects of Ash Amount and Molten Ash’s Behavior on Initial Fe–C Liquid Formation Temperature due to Iron Carburization Reaction

Ohno, Ko Ichiro; Tsurumaru, Shohei; Babich, Alexander; Maeda, Takayuki; Senk, Dieter; Gudenau, Heinrich Wilhelm; Kunitomo, Kazuya

doi:10.2355/isijinternational.55.1245

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…The pre-heat-treated coke was soaked into HCl solution and HF solution during predetermined time for ash removal treatment. 8) Residues amount of ash were measured by gravimetric measurement after combustion at 1 088 K under air atmosphere as JIS M 8812. The residues amount of ash after the acid treatment were dependent on duration of this treatment as shown in Fig.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…This reaction has been researched by many researchers with many different aspects. [4][5][6][7][8] From the reports from them, it generally could be understood that higher fixed carbon and lower ash containing carbonaceous material has an advantage for the carburization reaction. And also, higher graphitization degree of fixed carbon makes obvious difficult to progress the reaction.…”

Section: Effect Of Carbonaceous Materials Surface Texture On Iron Carbmentioning

confidence: 99%

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Effect of Carbonaceous Material Surface Texture on Iron Carburization Reaction under Loading Condition

et al. 2019

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Section: Experimental Methodologymentioning

confidence: 99%

Section: Effect Of Carbonaceous Materials Surface Texture On Iron Carbmentioning

confidence: 99%

Effect of Carbonaceous Material Surface Texture on Iron Carburization Reaction under Loading Condition

et al. 2019

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“…Figure 11 shows the comparison of the I V /I G values of the coke samples, graphite and two types of charcoal. 34) The I V /I G of graphite is very small because of its high crystallinity, while those of charcoal with low crystallinity are approximately 0.5. The I V /I G of the coke samples are approximately 0.35, which is higher than the intermediate value of that of graphite and charcoal.…”

Section: Carburization Behavior Of Iron Tablet By Platymentioning

confidence: 99%

Effect of Silica in Ash of Coke on Carburization and Melting of Iron

2021

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Reducing energy consumption in ironmaking process is essential for decreasing the amount of carbon dioxide emission from the blast furnace process. To effectively reduce carbon dioxide emission, a faster reduction of iron ore, as well as the acceleration of carburization and melting of the reduced iron is important. Understanding the ash behavior of coke in blast furnace is necessary for controlling carburization because ash prevents carburization. In this study, the following were investigated:1) Condensation behavior of the ash components on the surface of coke by gasification under the simulated blast furnace condition 2) Melting behavior of iron tablet by the direct contact with coke plate 3) In-situ observation of the melting behavior of coke-iron composite and effect of deashing treatment 4) In-situ observation of the melting behavior of Fe-Si alloy using graphite The results revealed that ash condenses on the coke surface via gasification, and the ash coverage ratio of the coke surface increases with increasing in the coke reactivity. In addition, the melting of iron by carburization with coke proceeds at lower temperature when the coke reactivity is high. However, the effect of ash coverage on this behavior is significantly higher than that of coke reactivity, and an increase in the ash coverage ratio suppresses the carburization and melting of iron. In addition, during holding at high temperature, SiO 2 in ash is reduced to Si, and it alloys with metallic iron. Furthermore, an increase in Si concentration in metallic iron increases the melting temperature of Fe-Si system. Consequently, carburization and melting iron are suppressed.

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“…It was indicated that ash of carbonaceous material has an obvious effect on carbon dissolution into iron by many reports, [11][12][13][14][15][16][17][18][19][20] including our previous works. 19,20) Knowledge of carbon dissolution behavior coexisting with ash is necessary to correctly understand wettability between molten iron and practical carbonaceous material, because the every practical carbonaceous material, coal, coke etc., basically includes not negligible amount of ash. Although there are some reports about effect of the ash on the liquid iron wettability, their results have problems from the conventional sessile method and from complexity of natural ash in the practical carbonaceous material.…”

Section: )mentioning

confidence: 99%

Effect of Carbon Dissolution Reaction on Wetting Behavior between Liquid Iron and Carbonaceous Material

et al. 2015

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A low carbon operation is an unfavorable situation for liquid permeability around cohesive zone, because liquid volume will increase against solid coke in there. In order to keep a healthy operation with this technique, information of wetting behavior between liquid iron and coke should be correctly understood. However, there is not enough information about wetting behavior between them, because of many difficulties about wettability measurement from an active reaction between iron and carbonaceous materials. In this study, a sessile drop method with molten sample injection system was applied to measurement of wetting behavior between liquid iron and carbonaceous material at 1 673 K for excluding reaction between samples before starting measurement. Carbonaceous material's substrates were made from mixture powder of graphite and alumina by hot press at 1 873 K. From the results, following knowledge was revealed. Molten iron samples un-saturated with carbon showed bigger values of contact angles, 110°-120°, at initial stage, than apparent constant values of them, 85°-100°, at latter stage. It indicated a reaction between iron and carbonaceous materials had obvious effect on wetting behavior between them due to decrease an interfacial energy during the reaction. Mixed alumina powder in the substrate prevented to wetting behavior of iron sample on carbonaceous materials, and they changed their apparent constant contact angles from 115° to 130°. The alumina powder had effects on not only wetting behavior but also reaction between iron and carbonaceous materials.KEY WORDS: wettability; carbon dissolution; sessile drop method with molten sample injection system; simulant coke; molten iron; carbonaceous material's substrate.

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Effects of Ash Amount and Molten Ash’s Behavior on Initial Fe–C Liquid Formation Temperature due to Iron Carburization Reaction

Cited by 12 publications

References 21 publications

Effect of Carbonaceous Material Surface Texture on Iron Carburization Reaction under Loading Condition

Effect of Carbonaceous Material Surface Texture on Iron Carburization Reaction under Loading Condition

Effect of Silica in Ash of Coke on Carburization and Melting of Iron

Effect of Carbon Dissolution Reaction on Wetting Behavior between Liquid Iron and Carbonaceous Material

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