Rate of SiO2 Inclusion Removal from Molten Cu to Slag under Mechanical Stirring Condition.

Okumura, Keiji; Hirasawa, Masahiro; Sano, Masamichi; Mori, Kazumi; Hakamada, Naruhiko; Kitazawa, Makoto

doi:10.2355/isijinternational.35.826

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…[22,23,24] Szekely investigated the removal of solid particles from molten aluminum during the spinning nozzle flotation process. [22] Okumura et al studied the removal of SiO 2 inclusions from molten Cu to the slag under gas injection stirring conditions.…”

Section: A Defectsmentioning

confidence: 99%

“…[22] Okumura et al studied the removal of SiO 2 inclusions from molten Cu to the slag under gas injection stirring conditions. [23] Miki et al investigated inclusion removal during steel RH degassing, considering bubble flotation as one of the inclusion-removal methods. [25] There is no complete fundamental knowledge concerning the inclusion removal by bubble flotation in liquid steel systems.…”

Section: A Defectsmentioning

confidence: 99%

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Inclusion removal by bubble flotation in a continuous casting mold

Zhang

Aoki

Thomas

2006

Metall Mater Trans B

174

129

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Fundamentally based computational models are developed and applied to quantify the removal of inclusions by bubbles during the continuous casting of steel. First, the attachment probability of inclusions on a bubble surface is investigated based on fundamental fluid flow simulations, incorporating the turbulent inclusion trajectory and sliding time of each individual inclusion along the bubble surface as a function of particle and bubble size. Then, the turbulent fluid flow in a typical continuous casting mold, trajectories of bubbles, and their path length in the mold are calculated. The change in inclusion distribution due to removal by bubble transport in the mold is calculated based on the computed attachment probability of inclusions on each bubble and the computed path length of the bubbles. In addition to quantifying inclusion removal for many different cases, the results are important to evaluate the significance of different inclusion-removal mechanisms. The modeling approach presented here is a powerful tool for investigating multiscale phenomena in steelmaking and casting operations to learn how to optimize conditions to lower defects.

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Section: A Defectsmentioning

confidence: 99%

Section: A Defectsmentioning

confidence: 99%

Inclusion removal by bubble flotation in a continuous casting mold

Zhang

Aoki

Thomas

2006

Metall Mater Trans B

174

129

View full text Add to dashboard Cite

show abstract

“…It is important to remove nonmetallic inclusions from molten steel by agglomeration, coalescence and flotation [1][2][3][4][5] for the purpose of obtaining clean steel. Many experimental and theoretical studies have been done on the agglomeration behavior of fine particles in liquid: agglomeration structure by using a fractal dimension, [6][7][8][9][10][11] wettability of particles, 12,13) heterogeneous agglomeration with a different surface electrification and size, [14][15][16][17][18] particle collision frequency in turbulent flow, 19,20) particle-size grouping.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Agglomeration Behavior of Fine Particles in Liquid among Various Mixing Operations

et al. 2018

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A two-step mechanism in nucleation of solid silica from Fe-O-Si melt

Zhao

Wang

Tian

et al. 2018

J. Theor. Comput. Chem.

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In order to control the structure and size distribution of silica inclusions in high purity steel, it is necessary to understand the nucleation mechanism of solid silica in molten steel. In high temperature reactions, crystallization begins with nucleation, which plays a crucial role in determining the structure and size of solid products. Nucleation originates in the formation of product intermediates. The structure and thermodynamic properties of silica clusters as the intermediate of solid silica products during nucleation were calculated by density functional theory. Comparison of thermodynamic properties of silica clusters and silicon deoxidation equilibrium experiment in liquid iron results shows the silica clusters with most of the dissolved silicon and oxygen in equilibrium; the molten iron silicon deoxidation reaction ([Si] [Formula: see text] [O] [Formula: see text] cannot reach thermodynamic equilibrium state, and some deoxidation products could only exist in the form of silica clusters but not the solid silica. Therefore, the nucleation process of solid silica in Fe-O-Si melt can be considered as a two-step process with silica clusters as intermediates. Finally, there are two paths of solid silica inclusion formation: one is that in the molten iron, the dissolved silicon reacts with the dissolved oxygen to form silica clusters, and clusters further nucleate and grow up; the second one is that silica clusters directly crystallized during the cooling process of the melt.

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Rate of SiO2 Inclusion Removal from Molten Cu to Slag under Mechanical Stirring Condition.

Abstract: A kinetic study has been made on SiO. inclusion

Cited by 4 publications

References 1 publication

Inclusion removal by bubble flotation in a continuous casting mold

Inclusion removal by bubble flotation in a continuous casting mold

Comparison of Agglomeration Behavior of Fine Particles in Liquid among Various Mixing Operations

A two-step mechanism in nucleation of solid silica from Fe-O-Si melt

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