Phosphorus distribution between MgO-saturated CaO-FetO-SiO2-P2O5-MnO slags and liquid iron.
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The phosphorus distribution ratios between CaO-MgOsat.-FetO-SiO2-P2O5(≤3wt%)-MnO(2-5wt%) or CaO-MgOsat.-FetO-SiO2-P2O5(4-5wt%) Slags and liquid iron have been obtained in the temperature range from 1550 to 1650°C. The dephosphorization quotients can be expressed by the following three different equations.(i) log (P2O5)/([P]2(FetO)5)=0.145[(%CaO)+0.3(%MgO) -0.5(%P2O5)+0.6(%MnO)]+22810/T-20.506(ii) log (P2O5)/([P]2(FetO)5)=7.87 log[(%CaO) +0.3(%MgO)-0.05(%FetO)-0.5(%P2O5) +0.6(%MnO)]+22240/T-27.124(iii) log (P)/([P](T.Fe)5/2)=0.0720[(%CaO)+0.3(%MgO) +0.6(%P2O5)+0.6(%MnO)]+11570/T-10.520The activity coefficient of P2O5 by Turkdogan and Pearson's treatment can be expressed as follows: log γP2O5=-1.02(23NCaO+17NMgO+8NFetO -26NP2O5+13NMnO)-22990/T+9.490In the plot of logarithms of activity coefficient of FetO against mole fraction of SiO2, the values for log γFetO tend to increase with increase of the P2O5 content and with the addition of MnO in the range of NSiO2<0.1.
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The Iron and Steel Institute of Japan | 論文
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