Behavior of Ironmaking Slag Permeation to Carbonaceous Material Layer

Saito, Kazutomo; Ohno, Ko Ichiro; Miki, Tsuneharu; Sasaki, Yasushi; Hino, Misutaka

doi:10.2355/isijinternational.46.1783

Cited by 27 publications

(21 citation statements)

References 8 publications

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“…5,6) On the other hand, under a poor wettability condition, a capillary force holds up the liquid at a narrow neck of the packed bed. 7,8) The hold-up of the liquid is influenced by the contact angle, surface tension, and packed layer structure, as described above. 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.…”

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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Section: )mentioning

confidence: 99%

Droplet Motion on Non-smooth Solid Surface

et al. 2015

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“…Consequently, the coal-based CCA reduction behaviors with the slag composition 'a', 'b' and 'c' have been well studied. [6][7][8][9][10] However, these slag compositions are not suitable © 2014 ISIJ for high Al2O3 iron ore due to the increase of slag volume. Thus, to effectively and extensively use high Al2O3-containing iron ores with CCA reduction process, alternative slag design must be developed.…”

Section: Introductionmentioning

confidence: 99%

Metal-slag Separation Behaviors of Pellets Consisted of Iron, Graphite and CaO–Al2O3 Based Slag Powders

et al. 2014

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In-situ observations of metal-slag separation behaviors between CaO-Al2O3 based slag, iron and graphite powder mixed pellets by a confocal laser-scanning microscope (CLSM) have been carried out to find the effective way to use high Al2O3 iron ore in CCA reduction processes. Since a particular type of high Al2O3 iron ore such as laterite contains small amount of NiO and Cr2O3, the effect of NiO and Cr2O3 on the metal-slag separation behaviors were also studied. The observed metal-slag separation behaviors were analyzed based on the equilibrium phase fractions calculated by FactSage and carbon diffusion simulation in an iron sphere particle with a spot carbon source condition. Based on these in-situ observations and carbon diffusion results, starting temperature of metal-slag separation was found to correspond to the eutectic temperature of CaO-Al2O3 based slag. The iron carburization was initiated by slag melting and most of iron particles were melted within about 20 s after slag melting. The rapid carburization after slag melting was introduced by the good wettability between solid iron and molten slag. NiO and Cr2O3 additions did not change the fundamental behaviors of metal-slag separation at least up to about 3 mass%. Based on these results, it was confirmed that high Al2O3 content iron ore can be used in CCA reduction process by using CaO-Al2O3 based slag.KEY WORDS: metal-slag separation; high Al2O3 iron ore; iron carburization; spot source diffusion; CaOAl2O3 based slag.

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“…2,3) On the other hand, in the case of non-wetting holdup, liquid accumulates on the site of concentrated, packed bed particles. 4,5) In this way, the amount of liquid in the packed bed depends on surface tension, contact angle, and the structure of the packed bed. As represented by Young's formula, the wettability is evaluated using the static contact angle, which is determined by the interface energy between the gas, liquid, and solid.…”

Section: Introductionmentioning

confidence: 99%