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| Thermodynamics of Dephosphorization Reaction for Producing Low Phosphorus Steel in Converter |
| LIU Kun1,LIU Liu2,HE Ping2,CUI Yang1,ZHU Guo-sen1,LI Hai-bo1 |
1. Strip Technology Department, Shougang Research Institute of Technology, Beijing 100043, China
2. Metallurgical Process Department, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract In order to produce low phosphorus steel with w(［P］)≤0.010%, thermodynamics of dephosphorization reation in converter was investigated systematically.The main factors of influencing phosphorus distribution ratio LP between slag and metal in converter were analyzed, the quantitative method of determining activity coefficient of P2O5 and oxygen partial pressure of dephosphorization reaction was studied, and selective oxidation problem of carbon and phosphorus element in molten steel was also discussed. The results show that: LP is mainly affected by oxygen partial pressure, activity coefficient of P2O5 and reaction temperature; activity coefficient of P2O5 may be more accurately calculated by the modified Кожуров regular solution model. Dephosphorization reaction is controlled by oxygen partial pressure of the slag, which depends on carbon content in molten steel, slag basicity and temperature. For traditional combined blown converter, the process conditions of producing low phosphorus steel with w(［P］)≤0010% are as follows: final slag basicity w(CaO)/w(SiO2)≥3.0, the final slag w(MgO)≤9.0%, the end-point carbon content w(［C］)≤0.065%, end-point temperature at 1873-1923K range.
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Received: 08 April 2011
Published: 16 January 2012
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2012, Vol. 47 
