碱度对保护渣结晶温度及结晶矿相的影响  

Influence of Basicity on Crystallization Temperature and Crystalline Phase of Mould Powder

作　　者：张翼飞 韩秀丽 刘丽娜 张韩 

机构地区：[1]华北理工大学矿业工程学院,河北唐山063009

出　　处：《钢铁钒钛》2015年第5期103-107,共5页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51174073)资助项目;国家钢铁联合研究基金(U1360106)资助项目

摘　　要：结合亚包晶钢保护渣的矿物成分和冶金性能特点,在实验室自制不同碱度的亚包晶钢保护渣,采用工艺矿物学方法,探讨碱度对保护渣结晶温度和结晶矿相的影响规律。结果表明：随碱度值的增加（0.9～1.3）,保护渣的结晶温度逐渐升高,热流密度先降低后升高再降低,对应的渣膜结晶率先增大后减小再增大,且渣膜结晶率均较高,达到75%以上。不同碱度对应渣膜的结晶矿物种类相同,主要组成矿物为枪晶石和硅灰石。随碱度增加,枪晶石含量不断增加,晶形逐渐增大;硅灰石含量不断减少,晶形逐渐变小。该研究成果对优化亚包晶钢保护渣具有重要指导意义。Based on chemical compositions and metallurgical properties of mould powder for hypoperitectic steel,the crystallization temperature and crystalline phase of experimental flux film in different basicity under laboratory conditions were observed by the method of process mineralogy. The results showed that with basicity（ 0. 9 ～ 1. 3） increasing,crystallization temperature increased,the heat flux initially decreased then increased and decreased again,the corresponding crystallization rate of flux films present increasing then decreasing and increasing. Meanwhile,the crystallization rate of flux films was very high,reaching to more than 75%. The crystalline minerals of flux films at different basicity were the same,mainly cuspidine and wollastonite. With the increase of basicity,cuspidine content continued to increase while wollastonite content gradually decreased. These results are expected to provide valuable reference on optimizing mould powder for hypoperitectic steel.

关 键 词：连铸 保护渣 碱度 结晶温度 矿相结构 

分 类 号：TF703.6[冶金工程—钢铁冶金]