MgO Solubility in Steelmaking Slags

Tayeb, Mohammed A.; Assis, Andre N.; Sridhar, Seetharaman; Fruehan, R. J.

doi:10.1007/s11663-015-0352-8

Cited by 35 publications

(17 citation statements)

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“…This was discussed in detail elsewhere. [16] Based on the initial target values and the results from chemical analysis, mass balances were conducted with respect to phosphorus to ensure the initial compositions were consistent with the final compositions for the entire system (metal + slag). The standard deviation limits were calculated based on the observed mass balance errors for all experiments.…”

Section: Resultsmentioning

confidence: 99%

“…A corresponds to the total surface area including the area of any metal droplets present due to possible emulsification of the metal phase, k is the mass transfer coefficient of P in the steel, and q S is the density of the metal. In a related publication [18] by the authors, a new correlation was developed using the data in this paper, another investigation of EAF-type slags and Suito's results. The details on the development and rationale are given elsewhere.…”

Section: Discussionmentioning

confidence: 99%

“…The current study data seems to have good agreement with previous studies. In a future publication, [18] the authors will investigate phosphorus partition in EAF-type slags, the effect of alumina and propose an improved correlation to predict the equilibrium phosphorus partition.…”

Section: Discussionmentioning

confidence: 99%

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Phosphorus Equilibrium Between Liquid Iron and CaO-SiO2-MgO-Al2O3-FeO-P2O5 Slag Part 1: Literature Review, Methodology, and BOF Slags

Assis

Tayeb

Sridhar

et al. 2015

Metall Mater Trans B

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Although the phosphorus reaction in steelmaking has been extensively studied, it continues to be a relevant topic as low phosphorus iron sources become less available and more expensive, necessitating the need for more accurate predictions of the partitioning of phosphorous as function of slag composition and temperature. The current study revisits some of the relevant literature on the topic and details the methodology and experimental setup used in recent studies on phosphorus equilibrium between liquid iron and slags. New data for BOF-type slags are presented, where equilibrium was approached from both metal and slag sides i.e., phosphorus was transferred from metal to slag and vice versa. It was found that slags with basicities higher than 2.5 and FeO contents around 20 to 25 wt pct can promote extensive dephosphorization, and high L P , ((pct P)/[pct P]), values were observed i.e., greater than 500.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Phosphorus Equilibrium Between Liquid Iron and CaO-SiO2-MgO-Al2O3-FeO-P2O5 Slag Part 1: Literature Review, Methodology, and BOF Slags

Assis

Tayeb

Sridhar

et al. 2015

Metall Mater Trans B

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“…[4] In the case of phosphorus refining in the BOF, much work has been carried out on the thermodynamic equilibrium between the metal and slag, [5][6][7] giving evidence to the kinetic inhibition of the potential partition possible. [8] This lack of equilibrium could either be caused by lack of homogeneity in the slag layer of the BOF, (reducing the local driving force for phosphorus partition into the slag), or through kinetic restrictions through a deficiency of required interface for refining to transpose across/mass transfer controlling delivery of impurities to the interface.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Cause of Spontaneous Emulsification of a Free Steel Droplet; Validation of the Chemical Exchange Pathway

Spooner

Assis

Warnett

et al. 2016

Metall Mater Trans B

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Small Fe-based droplets have been heated to a molten phase suspended within a slag medium to replicate a partial environment within the basic oxygen furnace (BOF). The confocal scanning laser microscope (CSLM) has been used as a heating platform to interrogate the effect of impurities and their transfer across the metal/slag interface, on the emulsification of the droplet into the slag medium. The samples were then examined through X-ray computer tomography (XCT) giving the mapping of emulsion dispersion in 3D space, calculating the changing of interfacial area between the two materials, and changes of material volume due to material transfer between metal and slag. Null experiments to rule out thermal gradients being the cause of emulsification have been conducted as well as replication of the previously reported study by Assis et al. [1] which has given insights into the mechanism of emulsification. Finally chemical analysis was conducted to discover the transfer of oxygen to be the cause of emulsification, leading to a new study of a system with undergoing oxygen equilibration.

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“…This software Concerning the lowers MgO values obtained by the software, Tayeb et al 24 analyzed FactSage's ability to accurately predict MgO saturation. Figure 10 uses Gibbs energy minimization to calculate general phase diagram sections thermodynamically using the zero phase fraction line concept (ZPF).…”

Section: Mgo Saturationmentioning

confidence: 99%

Slag Foaming Fundamentals - A Critical Assessment

et al. 2017

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Slag foaming is part of steelmaking process and could bring several benefits: it helps to save energy, improves productivity, enhances the refractory service life, decreases noise pollution and protects the bath from nitrogen incorporation. Unfortunately, slag foaming is a highly dynamic process that is difficult to control. There are factors that limit the quality of the foam generated on the slag, such as: basicity, FeO content, surface tension, viscosity, carbon and oxygen injection. This paper aims to discuss the main factor that induces foaming, mathematical models proposed by different authors and the use of isothermal solubility diagram (ISD) to predict the foam quality.

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MgO Solubility in Steelmaking Slags

Cited by 35 publications

References 1 publication

Phosphorus Equilibrium Between Liquid Iron and CaO-SiO2-MgO-Al2O3-FeO-P2O5 Slag Part 1: Literature Review, Methodology, and BOF Slags

Phosphorus Equilibrium Between Liquid Iron and CaO-SiO2-MgO-Al2O3-FeO-P2O5 Slag Part 1: Literature Review, Methodology, and BOF Slags

Investigation into the Cause of Spontaneous Emulsification of a Free Steel Droplet; Validation of the Chemical Exchange Pathway

Slag Foaming Fundamentals - A Critical Assessment

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