摘要
钒钛磁铁精矿的入炉方式是攀钢优化高炉炉料结构的重要内容,对V和Ti在软熔滴落过程中的迁移以及Ti(C,N)的生成有重要影响。目前钒钛烧结矿是攀钢高炉的主要炉料,约一半的钒钛磁铁精矿通过烧结矿进入高炉。通过对钒钛烧结矿在软熔滴落过程中的物相组成和化学成分的变化规律进行研究发现,在烧结矿的软熔滴落过程中,Ti、V、Si、Mg、Al等元素逐渐从钛赤铁矿、钛磁铁矿、铁酸钙等物相迁移到渣相中,同时炉渣吸收焦炭的硫分和灰分。金属铁中Ti、Si、S和C的质量分数已达到甚至超过正常生产时的水平,V的质量分数虽远低于正常生产时的水平,但在金属铁中的收得率远高于Ti、Si、S。烧结矿炉渣冷却后形成的主要物相是黄长石,其次是钙钛矿和辉石。Ti和V主要赋存于钙钛矿中,其次是黄长石和辉石中。在软熔过程中,生成的碳氮化钛很少;在重熔滴落过程中,渣中碳氮化钛显著增加。
The charging mode of vanadium-bearing titanomagnetite concentrate is an important matter for optimizing the burden structure of blast furnace in Pangang,which also has an important influence on the migration of V and Ti in the process of softening and melting process and the formation of Ti(C,N).At present,vanadium-titanium sinter is the main burden of blast furnace in Pangang,and about half of vanadium-bearing titanomagnetite concentrate enters the blast furnace through sinter.Therefore,the change of phase and chemical composition of vanadium-titanium sinter in the process of softening and melting process was studied.In the softening and dripping process of sinter,Ti,V,Si,Mg,and Al gradually migrate from the phases of titanohematite,titanomagnetite,calcium ferrite to the slag phase,and the slag absorbs the sulfur and ash of coke.The mass fraction of Ti,Si,S and C in hot metal has reached or even exceeded that of normal production.Although the mass fraction of V is much lower than that in normal production,the yield in metallic iron is much higher than that of Ti,Si and S.The main phase of slag after cooling is melilite,followed by perovskite and pyroxene.Ti and V mainly exist in perovskite,followed by melilite and pyroxene.In the process of softening,little titanium carbonitride is produced.However,in the process of melting,the content of titanium carbonitride in slag increases significantly.
作者
谢洪恩
胡鹏
郑魁
朱凤湘
Xie Hong’en;Hu Peng;Zheng Kui;Zhu Fengxiang(Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第2期107-117,共11页
Iron Steel Vanadium Titanium
关键词
钒钛烧结矿
软熔
滴落
物相组成
化学成分
vanadium-titanium sinter
softening and smelting process
dripping process
phase composition
chemical composition
