摘要
传统保护渣主要以CaO和SiO_(2)为基料,辅以适量助熔剂如CaF_(2)等构成;而无氟保护渣则是选用B_(2)O_(3)、TiO_(2)等合适的助熔剂来替代CaF_(2)达到绿色环保的目的。从保护渣的碱度、化学成分和结晶性能三方面,分别综述了传统含氟渣系CaO-SiO_(2)-CaF_(2)和新型无氟渣系CaO-SiO_(2)-B_(2)O_(3)、CaO-SiO_(2)-TiO_(2)渣膜传热的影响规律,总结了近十年来冶金工作者对含氟和无氟保护渣渣膜传热的研究成果,得出无氟保护渣结晶矿相中硅硼酸钙和钙钛矿与传统保护渣中枪晶石具有相似的结晶行为,B_(2)O_(3)和TiO_(2)的含量在4%~8%和3%~11%可有效控制传热,从而减少铸坯纵裂纹的发生。并提出了开发新型高效无氟保护渣的进一步研究方向,即无氟渣中氟化物替代物的迁移赋存规律对渣膜传热性能的影响机理。
The traditional mold flux is mainly composed of CaO and SiO_(2)as the base material,supplemented by an appropriate amount of fluxing agent such as CaF_(2);and the fluorine-free mold flux is to choose B_(2)O_(3)、TiO_(2)and other suitable flux to replace CaF_(2)to achieve the role of green metallurgy.In this paper,the influence laws of heat transfer of the traditional fluorine mold flux CaO-SiO_(2)-CaF_(2)and new fluorine-free mold flux CaO-SiO_(2)-B_(2)O_(3)and CaO-SiO_(2)-TiO_(2)flux films are reviewed from three aspects of basicity,chemical composition and crystallization properties of the mold flux.Summarizes the metallurgical workers in nearly a decade of fluoride and fluorine-free mold fluxs film heat transfer of research results,it is concluded that the fluorine-free mold flux silicon calcium borate and perovskite crystal mineral phases and traditional mold flux cuspidine have similar crystallization behavior,the content of B_(2)O_(3)and TiO_(2)range from 4%to 8%and 3%to 11%can effectively control the heat transfer,thereby reducing the occurrence of slab longitudinal cracks.
作者
韩秀丽
闫晓鹏
刘磊
赵凯
王程
杜亮
Han Xiuli;Yan Xiaopeng;Liu Lei;Zhao Kai;Wang Cheng;Du Liang(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210)
出处
《特殊钢》
2021年第6期6-13,共8页
Special Steel
基金
国家自然科学基金资助项目(51774140、51574105)
河北省高校基本科研业务费项目(JQN2020038)
河北省研究生创新资助项目(CXZZBS2021101)。
关键词
结晶器保护渣
渣膜
无氟
传热性能
Mold Flux
Flux Film
Fluorine-Free
Heat Transfer Performance
