Thermodynamic Analysis of Desulfurization and Its Connection With Deoxidation and Temperature for SPHC in JISC During LF Refining Process
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.
LF refining desulfurization deoxidation sulfur partition ratio
GUOJing CHENG Zi-jian CHENG Shu-sen CHENG Ze-wei ZOUMing MA Ming-sheng
State Key Laboratory of Advanced Metallurgy, University of Science and Technology of Beijing, Beijin State Key Laboratory of Advanced Metallurgy, University of Science and Technology of Beijing, Beijin Chinas Hongxing Stock Company of Jiugang, Jiugang 735000, Gansu, China
国际会议
The 2nd International Symposium on Clean Steel(第二届洁净钢生产技术学术研讨会)
沈阳
英文
135-140
2011-08-23（万方平台首次上网日期，不代表论文的发表时间）