1991•ISIJ InternationalOpen access

Sulphur Equilibrium Distribution between CaO-CaF2-SiO2-Al2O3 Slags and Carbon-saturated Iron.

Simeon Ratchev Simeonov, Ivancho Nikolov Ivanchev, Avgust Vasilev Hainadjiev

Abstract

Slags containing CaO.CaF2' Si02 and AI203 have found wide application with refining processes in iron- making and steelmaking practice and ladle metallurgy.A study of su[phur equilibrium partition between CaO-CaF2-Si02-Al203slags and carbon-saturated iron in temperature range 1 450-1 600'C was carried out in present work.The suiphur equilibrium distribution increases with replacing Si02 by CaOand Si02 by CaF2' while it decreases with substitution of CaOby CaF2at 1 500'C.Pc0=0,1 MPa if other variables like wto/o CaF2' wto/o Al203 or (wto/oAl203+wto/oSi02) are kept constant.Based on experimental data the equation of temperature dependency was found to be: 9 700 log L 8.2 -TThe 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, suiphide capacity of investigated quaternary slag system was calculated,

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Key concepts: Steelmaking, Partition coefficient, Slag (welding), Sulfur, Ladle, Metallurgy, Carbon fibers, Refining (metallurgy)