SPHC钢LF精炼过程的抑制回硅与脱硫研究  

Study on Silicon Increase and Desulphurization During LF Treatment of SPHC Steel

作　　者：李云[1] 李宏[1] 徐志荣[2] 李艳芳[3] 王新华[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]唐山钢铁集团公司第一炼钢厂,河北唐山063016 [3]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《钢铁》2007年第2期28-30,共3页Iron and Steel

摘　　要：生产SPHC钢在LF处理脱硫过程中不能抑制回硅。根据热力学理论推导出降硅参数A/S和脱硫参数C/A,应用共存理论作用浓度模型,在试验渣系成分范围内计算CaO、SiO2、Al2O3的活度求解A/S和C/A,探讨了它们与w(CaO)/w(Al2O3)、w(CaO)/w(SiO2)的关系。分析结果认为,控制w(CaO)/w(Al2O3)、w(CaO)/w(SiO2)在合适的范围内,可以有效地分别或同时抑制回硅和脱硫。与试验结果对照得知,A/S和C/A分别与LF渣系的抑制回硅和脱硫能力相对应,根据A/S和C/A进行控制是可行的。It is very difficult to inhibit silicon pick-up during desulfurization in LF treatment of SPHC steel. According to thermodynamic analysis,the silicon content decrease parameter A/S and desulphurization parameter C/A are put forward. The activities of CaO, SiO2 and Al2O3 are calculated with the model of mass action concentration of coexistence theory for experimental slags. Thus the parameters A/S and C/A are calculated and the relationship between ω（CaO）/ω（Al2O3 ） ,ω（CaO）/ω（SiO2 ） and the parameters A/S, C/A are discussed. Firstly, if the ω（CaO）/ ω（Al2O3 ）,ω（CaO）/ω（SiO2 ） are controlled within a rational range, it is possible to inhibit silicon increase and desulphurize by refining slag individually or simultaneously. Additionally, it is known that A/S can denote the refining slag＇s ability of decreasing the silicon pick-up from slag and C/A can denote slag＇s ability of desulphurization from experiment results. Finally,it is proved that it＇s feasible to control the slag composition according to A/S and C/A for achieving low silicon content or low sulphur or for both of them of molten steel.

关 键 词：SPHC钢 LF精炼 回硅 

分 类 号：TF769[冶金工程—钢铁冶金]