발간논문

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Vol.32, No.5, 538 ~ 545, 1994
Title
Influence of Slag Basicity on the mechanism of Sulphur Transport during the Molten Steel Desulphurization
곽사호 , 고제만 , 임병모 Sa Ho Gwak , Je Man Koh , Boung Mo Lim
Abstract
The mechanism of sulphur transport from steel bath into slag droplets produced during slag injection processes has been investigated by simulation experiments using the slags of different compositions. Powdered slags were introduced onto the surface of small steel melts in alumina crucibles at 1550℃ and the ensuing sulphur profiles in the steel and slag were determined by microprobe analysis. The results are as follows : 1) The desulphurization ability of molten steel appears to be best when the slag basicity is high. 2) The concentration and transport rate of sulphur within a slag is increased with high slag basicity; the mode of sulphur distribution is stepwise in basic slags while parabolic in acid. 3) Sulphur in the molten steel moved to the slag during the reaction and in the sulphur content in the steel at the interface was reached at the quasi-equilibrium state in a short reaction time. 4) The mechanism of sulphur transport seems to be controlled by a diffusion procsss in the slag side, which is in turn related to the viscosity of the slag.
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