脱硫剂化学组成对硅钢RH脱硫过程影响模拟  

Simulation for RH desulphur of silicon steel regarding chemical constituents of fluxes

作　　者：陈玉鑫 王建辉[2] 孙亮[2] CHEN Yuxin;WANG Jianhui;SUN Liang(CALDERYS CHINA,Beijing 100028;Steel Dept.,Beijing Shougang Holdings Co.,Ltd.,Tangshan 064404,China)

机构地区：[1]凯得力耐火材料(中国)有限公司,北京100028 [2]北京首钢股份有限公司炼钢部,河北唐山064404

出　　处：《电工钢》2024年第6期32-35,共4页ELECTRICAL STEEL

摘　　要：以往RH炉脱硫剂的化学组成对脱硫工艺影响的研究,主要集中于实验研究,对其物理化学反应机理并未做出详细阐述。使用FactSage软件对RH炉脱硫剂主要组分和辅助组分对脱硫的影响进行了模拟研究。研究发现,轻处理模式p=4 kPa真空压力下,硅钢冶炼RH炉中不会产生SiS气体、Ca蒸气和Mg蒸气;深真空模式p=50 Pa真空压力下,脱硫剂中MgO和CaO可与钢水中铝元素反应进而发生气化,MgO几乎100%被还原成Mg蒸气;Ca、SiS蒸气的生成,随着温度、渣钢比上升,尤其在1500℃以上时迅速增加;SiS气体的生成受到[Al]含量增加的抑制,渣量增加和硅含量增加有利于SiS气体的生成。三元相图模拟显示,存在一个生成100%液渣和CaS的区域,该区域成分的脱硫剂脱硫效果最佳。建议最佳的脱硫剂成分(质量分数)设计为:CaO=52%~60%,Al_(2)O_(3)=36%~48%,CaF_(2)=0~12%。Current studies for constituents of RH desulphur fluxes are mainly focusing on lab or industrial tirals,merely nothing about the thermal dynamics.The paper involved by FactSage in the process technologies about the influences by main constituents and assistant constituents of desulphur fluxes.It was found that in light treatment moldel with p=4 kPa,no gases of SiS,Ca or Mg generate in Silicon steel RH furnace,however in deep vacuum treatment model with p=50 Pa,nearly 100%of MgO and part of CaO is reduced by aluminium inside molten silicon steel and SiS gas get out simutaneously.Gases of Ca and SiS increase with higher temperature,esp.>1500℃,and higher slag steel ratio.Generation of SiS gas is depressed by inceasing aluminium content,in the contrary,encouraged by increasing silicon content.Ternary diagram calculations revealed that there is a typical range of flux constituents for best desulpur practice with 100%slag liquid and CaS phase,which includes,w(CaO)=52%~60%,w(Al_(2)O_(3))=36%~48%,w(CaF_(2))=0~12%.

关 键 词：RH精炼 脱硫剂 模拟 组分 

分 类 号：TF777.1[冶金工程—钢铁冶金] O224[理学—运筹学与控制论]