Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Oxygen Equilibrium and the Solubility of MgO in CaO-FetO-MgO-SiO2(≤5mass%)-ΣMxOy Slags and Molten Iron

CaO-FetO-MgO-SiO2(≤5mass%)-ΣMxOy계 슬래그의 MgO포화용해도와 용철 간 산소평형

  • Shin, Dong-Yeop (Division of Material Science and Engineering, Inha University) ;
  • Lee, Joo-Ho (Division of Material Science and Engineering, Inha University) ;
  • Hong, Seong-Hun (Division of Material Science and Engineering, Inha University) ;
  • You, Byung-Don (Division of Material Science and Engineering, Inha University) ;
  • Seo, Seong-Mo (Technical Research Laboratories, POSCO) ;
  • Park, Jong-Min (Technical Research Laboratories, POSCO)
  • 신동엽 (인하대학교 공과대학 신소재공학부) ;
  • 이주호 (인하대학교 공과대학 신소재공학부) ;
  • 홍성훈 (인하대학교 공과대학 신소재공학부) ;
  • 유병돈 (인하대학교 공과대학 신소재공학부) ;
  • 서성모 (POSCO 기술연구원) ;
  • 박종민 (POSCO 기술연구원)
  • Received : 2010.03.23
  • Published : 2010.08.22
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Abstract

Oxygen equilibrium and the solubility of MgO have been measured in the $CaO-Fe_tO-MgO-SiO_2({\leq}5mass%)-{\Sigma}M_xO_y$ slag in equilibrium with liquid iron in the temperature range of 1550 to $1700^{\circ}C$. The effect of oxides on the MgO solubility, and a method for calculating the solubility of MgO using slag composition and temperature,were discussed. The solubility of MgO is increased with increasing temperature and $Fe_tO$ content, and with decreasing basicity (C/S). The effect of ${\Sigma}M_xO_y$ on the solubility of MgO is a dilution effect due to the increase in slag volume. The activity and activity coefficient of $Fe_tO$ decreased with increasing basicity (B). The effect of temperature on the activity was negligible. The value of ${\rho}=Fe^{3+}/Fe^{2+}$ increased with the increase of the slag basicity (B") and the decrease of the $Fe_tO$ content in the slag.

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