K_(2)O对连铸保护渣润滑及传热性能的影响  

Effect of K_(2)O on the lubrication and heat transfer performance of continuous casting mold flux

作　　者：朱立光 郭超飞 郭志红[1,2] 韩宝臣 王现辉 谢天伟 赵海瑞 程林 ZHU Liguang;GUO Chaofei;GUO Zhihong;HAN Baochen;WANG Xianhui;XIE Tianwei;ZHAO Hairui;CHENG Lin(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Hebei Short Process Steel Making Technology Innovation Center,Shijiazhuang,Hebei 050018,China;Zhi Xin Qian'an Electromagnetic Materials Beijing Shougang Company Limited,Tangshan,Hebei 064404,China)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]河北省短流程炼钢技术创新中心,河北石家庄050018 [3]首钢智新电磁材料(迁安)股份有限公司,河北唐山064404

出　　处：《河北科技大学学报》2025年第2期207-214,共8页Journal of Hebei University of Science and Technology

基　　金：国家区域联合基金(U21A20114);河北省自然科学基金(E2022208019);河北省创新能力提升计划项目(23561007D);河北省重大科技支撑计划项目(242Q9910Z)。

摘　　要：为了改善连铸保护渣的润滑性能,提高控制传热能力,利用旋转黏度计、红外发射技术(IET)、红外光谱仪、拉曼光谱仪和X射线衍射仪(XRD)等,研究了K_(2)O对连铸保护渣性能的影响。结果表明:当[WTBX]ω(K_(2)O)=0~6%时,随着K_(2)O含量增加,保护渣的黏度(1300℃)呈先下降后升高的趋势,且ω(K_(2)O)=2%时,黏度和转折温度均为最低值;从熔渣微观结构可以看出,熔渣中简单结构单元Q 0和Q 1先升高后降低,复杂结构单元Al-O-Al和Si-O-Al先降低后升高,熔渣的复杂程度及整体聚合度呈先降低后升高的趋势;随着K_(2)O含量增加,促进了结晶相Bredigite(Ca_(7)Mg(SiO_(4))_(4))的析出,抑制了结晶相枪晶石(Ca_(4)Si_(2)F_(2)O_(7))的析出,导致保护渣的热流密度逐渐降低。综合来看,当ω(K_(2)O)=2%时,K_(2)O可以提高保护渣的润滑性能和控制传热能力,研究结果可为连铸生产提供理论参考。To improve the lubrication performance and heat transfer control capability of continuous casting mold flux,the effects of K_(2)O on its properties were systematically investigated by using a rotary viscometer,infrared emissivity technique(IET),infrared spectrometer,Raman spectrometer,and X-ray diffractometer(XRD).The results indicate that when the K_(2)O content increases from 0 to 6 wt.%,the viscosity of the mold flux(at 1300℃)initially decreases and then increases,and reaching its minimum value at 2 wt.%K_(2)O,along with the lowest transition temperature.Microstructural analysis reveals that the proportions of simple structural units(Q 0 and Q 1)in the molten slag firstly increase and then decrease,while complex structural units(Al-O-Al and Si-O-Al)exhibit the opposite trend.This leads to an initial reduction followed by an increase in the overall structural complexity and polymerization degree of the slag.Furthermore,increasing K_(2)O content promotes the precipitation of the Bredigite phase(Ca_(7)Mg(SiO_(4))_(4))while suppressing the formation of the Cuspidine phase(Ca_(4)Si_(2)F_(2)O_(7)),resulting in a gradual decline in the heat flux density of the mold flux.Comprehensive analysis demonstrates that the optimal K_(2)O content of 2 wt.%significantly enhances both lubrication performance and heat transfer regulation of the mold flux,which provides theoretical reference for optimizing continuous casting processes.

关 键 词：炼钢 连铸 保护渣 润滑 传热 

分 类 号：TF777[冶金工程—钢铁冶金]