Abstract
Experiments have been made to study the phosphorus distribution between liquid iron and MgO saturated CaO-MgO-FeOx-SiO2 slags containing 1 to 4% CaF2 in the temperature range 1550 to 1650°C. The effect of CaF2 on the equilibrium quotient kp(=(%P2O5)/{[%P]2(%FeO)5}) was found to be nearly equal to that of CaO on the weight percentage base. The equilibrium quotient kp is expressed as logkp=8.22log[(%CaO)+(%CaF2)+0.3(%MgO) -0.05(%FeO)]+21460/T-27.02 or logkp=0.156[(%CaO)+(%CaF2)+0.3(%MgO)] +20730/T-19.48The effect of CaF2 on the activity coefficient of P2O5 was also studied by the Turkdogan and Pearson's treatment. The following expression for the activity coefficient of P2O5 is given for the slags containing CaF2. logγP2O5=-1.01(23NCaO+21NCaF2+17NMgO+8NFeO) -26300/T+11.24It was found from the plot of the activity coefficient of FeO vs. the mole fraction of SiO2 that the activity of FeO increases with the addition of CaF2.
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