Study of slag/metal interface in ladle treatment

Dayal, Pranesh; Beskow, Kristina; Björkvall, Johan; Sichen, Du

doi:10.1179/174328106x149842

Cited by 28 publications

(31 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results indicate that the impurities can be removed more efficiently in dispersed phase than in bulk phase, even though the industrial slag has enough potential to remove the impurities from the bulk phase from the point view of equilibrium partition ratio. Dayal et al 4) have reported the formation of metal emulsion using industrial Fe-slag system in 65 tones induction and gas stirred ladles, and water/oil system under the gas bubbling. In Fe-slag system, the metal droplets were almost uniformly distributed in the slag phase, even though the sampling positions and stirring conditions were different.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al^|^ndash;Cu Alloy and Molten Salt System

et al. 2012

View full text Add to dashboard Cite

In steel refining process, an increase of interfacial area between the metal and slag through the metal droplets emulsified into the slag, so-called "metal emulsion", is one prevailing view for improving the reaction rate. The formation of metal emulsion was experimentally evaluated using Al-Cu alloy as metal phase and chloride salt as slag phase under the bottom bubbling condition. Samples were collected from the center of the salt phase in the container. Large number of metal droplets were separated from the salt by dissolving it into water. The number, surface area, and weight of the droplets increased with the gas flow rate and have local maximum values. The formation and sedimentation rates of metal droplets were estimated using a mathematical model. The formation rate increased with the gas flow rate and has a local maximum value as a function of gas flow rate, while the sedimentation rate is independent of the gas flow rate under the bottom bubbling condition. Three types of formation mode of metal emulsion, which occurred by the rupture of metal film around the bubble, were observed using high speed camera. During the process, an elongated column covered with metal film was observed with the increasing gas flow rate. This elongated column sometimes reached to the top surface of the salt phase. In this case, it is considered that fine droplets were not formed and in consequence, the weight of metal emulsion decreased at higher gas flow rate.KEY WORDS: metal emulsion; interfacial area; steelmaking; formation rate; sedimentation rate; formation mechanism of metal droplet.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al^|^ndash;Cu Alloy and Molten Salt System

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The accelerated rate of reactions at high gas flow rate has been attributed to this phenomenon in some cases. 19,20) On the other hand, Dayal and coworkers 5,7) found small metal droplets in the bulk of the slag, while no slag droplet has been detected in the metal bath.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of droplet generation and emulsification have been investigated through low temperature water modeling [4][5][6][14][15][16] as well as high temperature studies of slag-metal interactions. 1,2,5,[8][9][10] For example, dispersion of paraffin oil in water and mercury in paraffin oil have been reported by Tanaka and Guthrie. 14) In separate works on mercury/water-glycerin and mercury/alcohol systems, 15,16) it has been found that a film of the lower liquid on the bubble surface is carried to the upper phase and when the bubble bursts, many small droplets are generated.…”

Section: Introductionmentioning

confidence: 99%

“…Several experimental and mathematical studies [4][5][6][7][8][9][10][11][12][13] have been carried out on slag/metal droplet generation in the systems agitated by gas injection. The mechanism of droplet generation and emulsification have been investigated through low temperature water modeling [4][5][6][14][15][16] as well as high temperature studies of slag-metal interactions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cold Model Study of Emulsification Behavior in Bottom Blown Metallurgical Baths Covered with Thick Slag

Khajavi

Barati

2010

ISIJ Int.

View full text Add to dashboard Cite

In the processes with two interacting immiscible liquids, the overall rate of the inter-phase reactions is typically controlled by chemical reaction at the interface, mass transport within each phase, or combination of both. Under these conditions, the overall rate of the reaction between the two phases is closely related to the behaviour of their interface, the interfacial area in particular. In this work, aiming to study emulsification and the associated interfacial area increase in bottom blown metallurgical systems, water modeling was used. For two different water-oil systems, the droplet size distribution, water-oil interfacial area increase, and their dependence on gas flow rate and physical properties of the liquids were studied. The total interfacial energy and the fractions dissipated in forms of surface and potential energy were calculated.

show abstract

“…In addition, enhancing turbulence at the slag/steel interface is required to achieve a desirable desulphurization result [1]. Argon gas stirring (AGS) and electromagnetic stirring (EMS) are the two dominant methods in the ladle refining process [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Flow, Temperature, and Concentration Distribution Features of Combined Gas and Bottom-Electromagnetic Stirring in a Ladle

Deng

et al. 2018

Metals

View full text Add to dashboard Cite

Abstract:A novel method of combined argon gas stirring and bottom-rotating electromagnetic stirring in a ladle refining process is presented in this report. A three-dimensional numerical model was adopted to investigate its effect on improving flow field, eliminating temperature stratification, and homogenizing concentration distribution. The results show that the electromagnetic force has a tendency to spiral by spinning clockwise on the horizontal section and straight up along the vertical section, respectively. When the electromagnetic force is applied to the gas-liquid two phase flow, the gas-liquid plume is shifted and the gas-liquid two phase region is extended. The rotated flow driven by the electromagnetic force promotes the scatter of bubbles. The temperature stratification tends to be alleviated due to the effect of heat compensation and the improved flow. The temperature stratification tends to disappear when the current reaches 1200 A. The improved flow field has a positive influence on decreasing concentration stratification and shortening the mixing time when the combined method is imposed. However, the alloy depositing site needs to be optimized according to the whole circulatory flow and the region of bubbles to escape.

show abstract

Study of slag/metal interface in ladle treatment

Cited by 28 publications

References 16 publications

Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al^|^ndash;Cu Alloy and Molten Salt System

Influence of Bottom Bubbling Rate on Formation of Metal Emulsion in Al^|^ndash;Cu Alloy and Molten Salt System

Cold Model Study of Emulsification Behavior in Bottom Blown Metallurgical Baths Covered with Thick Slag

Numerical Study on Flow, Temperature, and Concentration Distribution Features of Combined Gas and Bottom-Electromagnetic Stirring in a Ladle

Contact Info

Product

Resources

About