Activity of Phosphorus Oxide in CaO-MnO-SiO2-PO2.5 (-MgO, FetO) Slags.

• Sobandi Ahmad

  Graduate School, Muroran Institute of Technology

• Katayama Hiroshi G.

  Department of Materials Science and Engineering, Muroran Institute of Technology

• Momono Tadashi

  Department of Materials Science and Engineering, Muroran Institute of Technology

Abstract

The CaO–MnO–SiO₂–PO_2.5(–MgO, Fe_tO) slags were equilibrated with liquid copper alloys in a molybdenum crucible under a flowing CO₂/H₂ atmosphere in the temperature range of 1573 to 1673 K.<br> The activity coefficient of PO_2.5, γ_{PO_2.5}, and the phosphate capacity, C_PO₄^3-=(%PO₄^3-)/P_P₂^1/2P_O₂^5/4, of the slags were expressed as follows:<br><br>log γ_{PO_2.5} = –2.59 {(%CaO)+0.33(%MnO)+0.55(%MgO)–0.90(%Fe_tO)–0.77(%PO_2.5)}/(%SiO₂)+1400/T–5.75<br>log C_PO₄^3- = 2.60{(%CaO)+0.33(%MnO)+0.55(%MgO)–0.90(%Fe_tO)–0.77(%PO_2.5)}/(%SiO₂)+40400/T–6.48<br><br> The phosphorus distributions between hot metal and the slag were examined, based on the thermodynamic data obtained in the present study. From comparison with the plant data, it was concluded that the thermodynamic data obtained in the present study are satisfactorily applicable to the thermodynamic assessment of hot metal pretreatment with high MnO slag.

Journal

• ISIJ International

  ISIJ International 38 (8), 781-788, 1998

  The Iron and Steel Institute of Japan

Keywords

• thermodynamics
• dephosphorization
• high MnO slag
• Cu–Mn–P alloy
• hot metal
• activity coefficient
• phosphorus oxide
• phosphate capacity

Details

• CRID: 1390282681430888448
• NII Article ID: 10002460282
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.38.781
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/38/8/38_8_781/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed