Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effect of Calcium Fluoride on Phosphorus Distribution between MgO-saturated Slags of the System CaO-MgO-FeOx-SiO2 and Liquid Iron
Hideaki SUITORyo INOUE
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1982 Volume 68 Issue 10 Pages 1541-1550

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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 from 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 a weight percentage base. The equilibrium quotient kp is expressed as log kp-8.22log[(%CaO)+(%CaF2)+0.3(%MgO)-0.05(%FeO)]+21460/T-27.02
or log kp-0.156[(%CaO)+(%CaF2)+0.3(%MgO)]+20730/T-19.48
The effect of CaF2 on the activity coefficient of P2O5 was also studied by TURKDOGAN and PEARSON'S treatment. The following expression for the activity coefficient of P2O5 was given for CaF2-containing slags.
logγP2O5=-1.01(23NCaO+21NCaF2+17NMgO+8NFeO)-26300/T+11.24
It was found from the plot of the activity coefficient of FeO versus mole fraction of SiO2 that activities of FeO increased with addition of CaF2.

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© The Iron and Steel Institute of Japan
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