Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Thermodynamic of Phosphorus in FeO-MnO-CaO-SiO2-MgOsatd. Slag Systems

FeO-MnO-CaO-SiO2-MgOsatd. 슬래그에서의 P의 열역학적 거동

  • Cho, Moon Kyung (Yonsei University, Department of Metallurgical Engineering) ;
  • Park, Kyung Ho (Korea Institute of Geoscience and Mineral Resources (KIGAM), Mineral Resources Research Division) ;
  • Min, Dong Joon (Yonsei University, Department of Metallurgical Engineering)
  • 조문경 (연세대학교 공과대학 신소재공학부 금속시스템공학과) ;
  • 박경호 (한국지질자원연구원 광물자원연구부) ;
  • 민동준 (연세대학교 공과대학 신소재공학부 금속시스템공학과)
  • Received : 2008.11.07
  • Published : 2009.03.25
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Abstract

Recently, new extraction technology for manganese nodule has been developed as alternative noble metallic resources. It is important to understand thermodynamic behaviors of phosphorus in low basic slag system from the viewpoint of the refining processing optimization. Thermodynamic behaviors of phosphorus in the $FeO-MnO-CaO-SiO_2-MgO_{satd.}$ slag system were investigated at 1723 K with various oxygen potential and slag composition of low basicity. The experimental results for dependence of phosphorus on oxygen potential and slag basicity indicated that the dissolution mechanism of phosphorus into slag of low basicity could be derived as follows; $[P]+5/4O_2+(O^{2-})=({PO_{3.5}}^{2-})$ Present experimental results implied that stability of phosphorus in slag would be depended on both of $O^{2-}$ (basicity) and content of $Ca^{2+}$ in molten slag. The thermodynamic effect of FeO, MnO and $Na_2O$ on low basicity on phosphate capacity was discussed.

Keywords

Acknowledgement

Supported by : 한국지질자원연구원

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