摘要
The thermodynamic characteristics of desulfurization reaction(CaO)+[S]=(CaS)+[O]is analyzed based on the detailed composition of liquid steel and slag of Steel Plate Hot Commercial(SPHC)in Jiuquan Iron&Steel Corporation(JISC),where the activities of CaO,CaS and Al2O3 in molten slag are calculated by thermodynamic software FactSage for a more accurate result.The critical values of[O%]/[S%]for desulfurization at different temperature is are obtained,typically 0.09 at 1873K,which shows directly that it should deoxidize adequately for obtaining a favorable desulfurization condition.In addition,the thermodynamic analysis indicates that the actual dissolved O is much higher than that of equilibrium calculation which shows Al-O reaction in LF is far away from equilibrium,but it is perfect agreement with the computing results when taking the activity of Al2O3 as 1 that due to the inclusion component in LF is mainly Al2O3.Besides,with the temperature rise,the sulfur partition ratio increases softly meanwhile the reaction between Al and O is limited to a great degree resulting in the increase a dissolved oxygen in liquid steel that decreases the sulfur partition ratio seriously.As a result,the sulfur partition ratio appears to decrease with temperature increase in Al killed steel.
