• Title/Summary/Keyword: 매크로 편석

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Coupled Turbulent Flow, Heat and Solute Transport in Continuous Casting Processes with EMBR (EMBR을 이용한 연속주조공정에서 난류 유동, 상변화 및 매크로 편석에 대한 연구)

  • Kang, Kwan-Gu;Ryou, Hong-Sun;Hur, Nahm-Keon
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1195-1200
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    • 2004
  • A fully coupled fluid flow, heat, and solute transport model was developed to investigate turbulent flow, solidification, and macrosegregation in a continuous casting process of steel slab with EMBR. Transport equations of mass, momentum, energy, and species for a binary iron-carbon alloy system were solved using a continuum model. The electromagnetic field was described by the Maxwell equations. A finite-volume method was employed to solve the conservation equations associated with appropriate boundary conditions. The effects of intensity of magnetic field and carbon segregation were investigated. The electromagnetic field reduces the velocity of molten flow in the mold and an increase in the percentage of C in steel results in a decrease of carbon segregation ratio.

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Removal of Fe from Metallurgical Grade Si by Directional Solidification (일방향 응고에 의한 금속급 실리콘 중 Fe 제거)

  • Sakong, Seong-Dae;Son, Injoon;Sohn, Ho-Sang
    • Resources Recycling
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    • v.30 no.4
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    • pp.20-26
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    • 2021
  • Solar grade silicon (SoG-Si) has been commercially supplied mainly from off-grade high-purity silicon manufactured for electronic-grade Si (EG-Si). Therefore, for wider application of solar cells, the development of a refining process at a considerably lower cost is required. The most cost-effective and direct approach for producing SoG-Si is to purify and upgrade metallurgical-grade Si (MG-Si). In this study, directional solidification of molten MG-Si was conducted in a high-frequency induction furnace to remove iron from molten Si. The experimental conditions and results were also discussed with respect to the effective segregation coefficient, Scheil equation, and Peclet number. The study showed that when the descent velocity of the specimen decreased, the macro segregations of impurities and ingot purities increased. These results were derived from the decrease in the effective segregation coefficient with the decrease in the rate of descent of the specimen.