ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Sulphur Equilibrium Distribution between CaO-CaF2-SiO2-Al2O3 Slags and Carbon-saturated Iron
Simeon Ratchev SimeonovIvancho Nikolov IvanchevAvgust Vasilev Hainadjiev
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1991 Volume 31 Issue 12 Pages 1396-1399


Slags containing CaO, CaF2, SiO2 and Al2O3 have found wide application with refining processes in ironmaking and steelmaking practice and ladle metallurgy. A study of sulphur equilibrium partition between CaO-CaF2-SiO2-Al2O3 slags and carbon-saturated iron in temperature range 1 450-1 600°C was carried out in present work.
The sulphur equilibrium distribution increases with replacing SiO2 by CaO and SiO2 by CaF2, while it decreases with substitution of CaO by CaF2 at 1 500°C, PCO=0.1 MPa if other variables like wt% CaF2, wt% Al2O3 or (wt%Al2O3+wt%SiO2) are kept constant. Based on experimental data the equation of temperature dependency was found to be:
log LS=8.2–(9700/T)
The activity coefficient of sulphur (fS) in carbon saturated iron was determined at 1 500°C as 6.9. Based on obtained equilibrium data for LS, sulphide capacity of investigated quaternary slag system was calculated.

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