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

Ohno, Ko Ichiro; Miyake, Takahiro; Yano, Shintaro; Nguyen, Cao Son; Maeda, Takayuki; Kunitomo, Kazuya

doi:10.2355/isijinternational.55.1252

Cited by 17 publications

(14 citation statements)

References 21 publications

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“…[10][11][12][13] In our previous studies, the apparent contact angles values at 1 673 K decreased during the initial contact period from 120, 123, 125° to 87, 90, 105° of Fe-3.70, 4.26, 4.90 mass% C samples, respectively. 10,11) And, the apparent contact angles also increased with increasing of the initial carbon concentrations of the Fe-C sample.…”

Section: Apparent Contact Angles Between Fe-c Samplementioning

confidence: 71%

“…11) In the previous study, intrusion of iron in the substrates after contact period of 1 800 s was observed. In other words, carbon atoms dissolved into the Fe-C sample at high temperature due to the carbon dissolution reaction, which led to the appearance of the region for occupancy of the liquid Fe-C in the substrate.…”

Section: Effect Of Carbon Dissolution On the Apparent Con-mentioning

confidence: 88%

“…10,11) These studies reported the large change in wetting behaviour in the initial period of contact. Carbon dissolution reaction and interfacial morphology in this contact period are possibility to be the main reasons to strongly influence the wetting behaviour between the liquid iron and the substrate.…”

Section: )mentioning

confidence: 99%

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Effect of Carbon Dissolution Reaction on Wetting Behaviour of Molten Fe–C Alloy on Graphite Substrate in the Initial Contact Period

et al. 2017

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A wetting behaviour of Fe-C sample on carbonaceous materials has been extensively investigated to understand the liquid flow behaviour in lower part of blast furnace. The previous studies reported a large change in apparent contact angle in the initial contact period in the wetting between the Fe-C sample and the carbonaceous materials substrate. The carbon dissolution reaction and the interfacial morphology in the initial contact period would strongly affect the wetting behaviour in this period. To further understand the wetting behaviour between the Fe-C sample and the substrate, the effects of the carbon dissolution reaction on the wetting behaviour in the initial contact period must be considered. 4.26,4.90 mass% C samples were fabricated using a high-frequency induction heating furnace under an inert gas atmosphere. The graphite substrate was made from 99.90% pure graphite powder using a hot press furnace under an argon gas atmosphere. The wetting behaviour of the graphite substrate with molten Fe-C sample is investigated using a sessile drop method with a molten sample injection and quenching systems. The results shown that the apparent contact angles significantly decreased from the initial apparent contact angle. The carbon concentration of the carbon-unsaturated Fe-C sample gradually increased and reached the saturation after the 300 s of contact. The formation of concave was observed and developed in the initial contact period due to the transfer of carbon atoms into the carbon-unsaturated Fe-C sample. The wetting behaviour was dependent on interfacial energy of solid-liquid phases before the formation of concave. After the formation of concave, the wetting behaviour dominantly depended on interfacial morphology change.KEY WORDS: wetting behaviour; initial contact period; sessile drop method with molten sample injection system; quenching system; carbon dissolution reaction; interfacial morphology; formation of concave.

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Section: Apparent Contact Angles Between Fe-c Samplementioning

confidence: 71%

Section: Effect Of Carbon Dissolution On the Apparent Con-mentioning

confidence: 88%

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Effect of Carbon Dissolution Reaction on Wetting Behaviour of Molten Fe–C Alloy on Graphite Substrate in the Initial Contact Period

et al. 2017

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“…The wettability between carbon and slag in a blast furnace was thoroughly described by Mukai et al 9) and Barrett et al 10) Measurements of the contact angle between the coke and liquid have been conducted in recent years considering the influence of ash. 11,12) The contact angle between pig iron and coke is 60-130°. 13) In addition, this angle changes with a change in the carbon or sulfur concentration in the iron.…”

Section: )mentioning

confidence: 99%

Droplet Motion on Non-smooth Solid Surface

et al. 2015

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Liquid dripping in a packed bed of coke in a blast furnace decreases the gas permeability and production stability. Enhancing the liquid flow is desirable to increase the productivity of the blast furnace process. The wettability between the liquid and coke affects the dripping behavior. In present study, the contact angle of a moving droplet on a non-smooth solid surface was investigated considering dripping slag and pig iron droplets in a packed bed of coke. The advancing and receding contact angles of water and mercury on a substrate were measured at room temperature while controlling the wettability and roughness. The angles between the cut surface of the coke and water or mercury were also measured. The roughness of the solid surface affected the movement of the adhering droplets, but the effect of the roughness was significantly altered by the wettability. It was found that the resistance to movement of the liquid increased and decreased under good and poor wettability conditions, respectively. Because the wettability of the liquid phase in the blast furnace changed depending on the temperature and composition of molten slag or iron, the force on a liquid droplet from the coke surface changed depending on the position and composition of the hot metal and molten slag in the coke bed.

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“…[1][2][3][4][5] In turn, this causes the blast furnace to perform more favourably and efficiently, and consequently, reduces fuel consumption of the blast furnace and suppresses CO 2 emissions. Therefore, the behaviour of the liquid phase dripping through this area is significant to the blast furnace operation.…”

Section: Introductionmentioning

confidence: 99%

Role of Al<sub>2</sub>O<sub>3</sub> in Interfacial Morphology and Reactive Wetting Behaviour between Carbon-unsaturated Liquid Iron and Simulant Coke Substrate

et al. 2016

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Wetting between liquid iron and coke influences liquid flow in the lower part of a blast furnace, which strongly affects the operation of the furnace. With increasing fluidity, the blast furnace performs more favourably and efficiently. To further improve blast furnace operation, the wetting behaviour of liquid iron on coke must be correctly understood. The effects of ash in the coke on reactive wetting in concave formations, such as holes formed at the contact area, must be considered. This study aims to elucidate the effects of the ash component in coke on the reactive wetting behaviour of carbon-unsaturated liquid iron on a simulant coke substrate and concave formations thereof. In this study, reactive wetting between the iron samples and the substrates was measured by a sessile drop method with a molten injection system at 1 673 K. The results revealed that the apparent contact angle significantly decreased with time in the first 300 s after contact. After 300 s, the contact angle stabilized at a constant equilibrium value. The initial contact angles depended not only on the carbon concentration of the liquid iron, but also on the Al 2 O 3 content in the substrates. Concave geometries formed when the carbon-unsaturated iron samples were wetted on substrates containing 0, 5, and 10 vol% Al 2 O 3 . The effect of Al 2 O 3 on the carbon dissolution reaction was the main factor affecting the reactive wetting behaviour of substrates against liquid iron.

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

Cited by 17 publications

References 21 publications

Effect of Carbon Dissolution Reaction on Wetting Behaviour of Molten Fe–C Alloy on Graphite Substrate in the Initial Contact Period

Effect of Carbon Dissolution Reaction on Wetting Behaviour of Molten Fe–C Alloy on Graphite Substrate in the Initial Contact Period

Droplet Motion on Non-smooth Solid Surface

Role of Al<sub>2</sub>O<sub>3</sub> in Interfacial Morphology and Reactive Wetting Behaviour between Carbon-unsaturated Liquid Iron and Simulant Coke Substrate

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