喷雾干燥法制备空心颗粒连铸保护渣  

Preparation of hollow particle mold flux for continuous casting by spray drying

作　　者：赵春宝 何峰 李晓阳 陈永彦 谢峻林 ZHAO Chunbao;HE Feng;LI Xiaoyang;CHEN Yongyan;XIE Junlin(Xixia Longcheng Metallurgical Materials Co.,Ltd.,Xixia 474550,Henan,China;School of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]西峡龙成冶金材料有限公司,河南西峡474550 [2]北京工业大学材料科学与工程学院,北京100124

出　　处：《中国冶金》2024年第6期110-117,共8页China Metallurgy

基　　金：河南省制造业高质量发展项目(074055);南阳市重大科技专项(2020ZDZX01)。

摘　　要：在连铸成型的过程中,铜结晶器需要在高温条件下连续使用保护渣材料,以满足钢水凝固坯壳与结晶器之间的传热、润滑等工艺要求。连铸成型对保护渣宏观结构、形貌、含水率等理化性能有着非常高的要求。利用旋转黏度仪对不同含水配置的保护渣泥浆黏度进行测试,利用喷雾干燥生产线对不同料性泥浆进行试验性生产,利用DSC-TG、SEM、粒度分析、铺展性测试等手段,对所制得的保护渣结构与性能表征结果开展研究,获得了较优性能的空心颗粒保护渣与其生产工艺参数。结果表明,随着泥浆中水加入量(质量分数)由33.7%增加到53.7%,其黏度由25.1 Pa·s降低到7.6 Pa·s,流动性增强。不同的喷雾干燥进口热风温度可适应的泥浆水含量范围有所不同,且对保护渣中的残余水含量影响较大。保护渣的粒度分布集中在[0.16,0.50)mm,其中[0.35,0.45)mm的保护渣占55%以上,安息角为29o。通过喷雾干燥方法制备出的保护渣有明显的空心球结构,颗粒的同心度与铺展性能良好。研究结果对利用喷雾干燥方法生产保护渣具有参考意义。During the continuous casting process,the copper crystallizer needs to continuously use mold flux materials under high temperature conditions to meet the process requirements of heat transfer and lubrication between the solidified steel shell and crystallizer.Continuous casting process has very high requirements for the macroscopic structure,morphology,moisture content and other physical and chemical properties of mold flux.The rotary viscometer was used to test the viscosity of mold flux slurries with different water content configurations.The spray drying production line was used to produce slurries of different materials.DSC-TG,SEM,particle size analysis,and spreading property test were used to characterize the structure and properties of the produced mold fluxes,and hollow particle mold flux with better performance and production process parameters were obtained.The results show that,as the amount of water added to the slurry increases from 33.7%to 53.7%(mass fraction),its viscosity decreases from 25.1 Pa·s to 7.6 Pa·s,and its fluidity is enhanced.Different inlet hot air temperature of spray drying can adapt to different range of slurry water content,and it has a greater impact on the residual water content of mold flux.The particle size distribution of mold fluxes is concentrated in 0.16-0.50 mm,of which 0.35-0.45 mm mold flux accounts for more than 55%,with a resting angle of 29o.The mold flux prepared by spray drying method has obvious hollow ball structure,and the concentricity and spreading performance of particles are good.The research results have reference significance for the production of mold flux by spray drying method.

关 键 词：喷雾干燥 空心保护渣 残余水含量 结构 铺展性能 

分 类 号：TF777[冶金工程—钢铁冶金]