Viscosities of LF Slags and Their Impact on Ladle Refining.

Jönsson, Pär; Jonsson, Lage; Sichen, Du

doi:10.2355/isijinternational.37.484

Cited by 56 publications

(49 citation statements)

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“…Recently, several works based on the numerical solutions based on mathematical modeling about both the slag layer and the melt flow fields have been reported. [9][10][11][12][13] However, little is known about the transient effect of slag layer on flow characteristics of gas stirred system and the exact explanation about the formation mechanism of plume eye is not made.…”

Section: Introductionmentioning

confidence: 99%

Transient Fluid Flow Phenomena in a Gas Stirred Liquid Bath with Top Oil Layer—Approach by Numerical Simulation and Water Model Experiments

et al. 2001

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Section: Introductionmentioning

confidence: 99%

Transient Fluid Flow Phenomena in a Gas Stirred Liquid Bath with Top Oil Layer—Approach by Numerical Simulation and Water Model Experiments

et al. 2001

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“…[16][17][18][19] To enable comparison of our findings with those of a previous study using a Sn alloy/chloride system, 3) the same experimental conditions as those in the previous study were adopted in the present study, including the sampling method, height of each liquid phase, gas flow rate, and composition of the Sn alloy.…”

Section: Methodsmentioning

confidence: 87%

Metal Emulsion in Sn Alloy/oxide System by Bottom Gas Injection

et al. 2017

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A metal emulsion is formed by the passage of gas bubbles through the interface between the metal phase and the slag phase in the steelmaking process. Emulsified metal droplets have great potential to improve the chemical reaction efficiency during motion in bulk slag. Several studies have focused on the formation mechanism of metal droplets and on the influence of the physical properties of the system on this mechanism. In this study, Sn alloy and sodium tetraborate were used to simulate molten steel and slag, respectively. Gas bubbles were introduced from the bottom of a molten metal bath at various gas flow rates. Slag containing metal droplets at the center of the slag phase was sampled, and the metal droplets were extracted by the dissolution of the oxide in a solvent. The number and diameter of the droplets were measured using a digital microscope. Under the same experimental conditions, the number of metal droplets in the oxide system was smaller but their size was larger than those in a previously investigated Sn alloy/chloride system. In both the systems, the total mass of metal droplets formed by a single bubble increased with an increase in the volume of the gas bubble, and when the volume of the gas bubble was small, the total mass of droplets in the oxide system was smaller than that in the chloride system. The sedimentation rate and coefficient in the oxide system were lower than those in the chloride system.

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“…variação da viscosidade com relação a diferentes temperaturas é muito significativa, podendo quadriplicar seu valor em temperaturas mais baixas. Este é um aspecto muito negativo, pois a viscosidade tem efeitos muito expressivos no processo de refino secundário, e é importante determinar seu valor para desenvolver práticas de refino mais precisas [4]. À medida que ocorre a dissolução de C 2 S a viscosidade diminui, com seu ponto mínimo coincidindo com o ponto de saturação de MgO nas três curvas.…”

Section: Fração De Fases E Viscosidade Para Basicidade Binária 15unclassified

“…A viscosidade é uma das propriedades da escória e pode ser definida como a resistência ao escoamento de um fluido quando submetido a uma força externa. Essa propriedade é fortemente influenciada pela composição e temperatura, e controla muitas das interações entre escória e refratário e reações entre escória e aço, sendo fundamental na limpeza inclusionária [3,4]. Em geral, à medida que a viscosidade da escória aumenta, diminui a capacidade da escória de absorver inclusões [5].…”

Section: Introductionunclassified

Estudo Da Viscosidade De Escórias De Refino Secundário Através Da Termodinâmica Computacional

Netto¹,

Bielefeldt²,

Vilela³

et al. 2017

Anais Do Enemet - Encontro Nacional De Estudantes De Engenharia Metalúrgica, De Materiais E De Minas

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ResumoNa fabricação de aços, uma das funções do refino secundário é a remoção das inclusões não metálicas geradas durante o processo. A viscosidade da escória influencia sobremaneira nas trocas de massa entre banho metálico e escória, sendo, portanto, uma de duas propriedades mais importantes. Em vista disso, este trabalho tem como objetivo estudar escórias de refino secundário quanto à sua viscosidade, analisando os principais fatores que influenciam esta propriedade. A partir de dados de composição química de amostras de escória de uma qualidade de aço comercial, foram feitas simulações termodinâmicas utilizando o software FactSage. Foram obtidas informações sobre as fases presentes no processo, frações sólida e líquida, ponto de saturação de MgO e viscosidade efetiva da escória. Com base nesses resultados, concluiu-se que o aumento da basicidade tende a aumentar a fração sólida e a viscosidade, mas ao chegar à sua saturação de sólidos, o aumento da basicidade age na parte líquida da escória, quebrando as cadeias de silicato nela presentes e diminuindo a sua viscosidade. Além disso, percebeu-se que a viscosidade efetiva dessas escórias é bastante elevada devido à presença de altas frações sólidas, podendo resultar em problemas para o aço estudado.Palavras-chave: Escória; Refino secundário; Viscosidade; Termodinâmica computacional. STUDY OF SECONDARY REFINING SLAGS' VISCOSITY THROUGH COMPUTATIONAL THERMODYNAMICS AbstractIn steel production, one of the purposes of secondary refining is to remove nonmetallic inclusions generated during the process. Slag's viscosity influences mass exchange between metal bath and slag, being, therefore, one of the slag's most important properties. Thus, this article aims as goal to study secondary refining slags' viscosity, analyzing the main factors that influence this property. From chemical composition of slag samples' data of one commercial steel type, thermodynamics simulations were conducted with the software FactSage. Information were obtained from phases present in the process, solid and liquid fractions, MgO saturation point and effective viscosity of the slag. Based on these results, it was concluded that the basicity's raise tends to increase solid fraction and viscosity, but as it reaches the solids saturation, the basicity's raise acts on the liquid slag, breaking its silicate chains and reducing its viscosity. In addition, it was possible to notice that the effective viscosity of these slags is quite high due to the presence of high solid fractions, which may result in problems for the studied steel.

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Viscosities of LF Slags and Their Impact on Ladle Refining.

Cited by 56 publications

References 0 publications

Transient Fluid Flow Phenomena in a Gas Stirred Liquid Bath with Top Oil Layer—Approach by Numerical Simulation and Water Model Experiments

Transient Fluid Flow Phenomena in a Gas Stirred Liquid Bath with Top Oil Layer—Approach by Numerical Simulation and Water Model Experiments

Metal Emulsion in Sn Alloy/oxide System by Bottom Gas Injection

Estudo Da Viscosidade De Escórias De Refino Secundário Através Da Termodinâmica Computacional

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