浸入式水口氧化铝结瘤堵塞机制  

Mechanism of Alumina Clogging on Submerged Entry Nozzle

作　　者：李红霞[1] 顾强 刘国齐[1] 袁磊 职建军[3] LI Hongxia;GU Qiang;LIU Guoqi;YUAN Lei;ZHI Jianjun(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.Ltd,Luoyang 471039,Henan,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Baoshan Iron and Steel Co.,Ltd,Shanghai 201900,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司,先进耐火材料国家重点实验室,河南洛阳471039 [2]东北大学冶金学院,沈阳110819 [3]宝山钢铁股份有限公司,上海201900

出　　处：《硅酸盐学报》2024年第2期381-389,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51932008);中原科技创新领军人才(204200510011)。

摘　　要：浸入式水口(SEN)结瘤堵塞已成为中国高品质钢和高性能特殊钢质量和效率提升的关键问题,至今仍未得到有效解决。本实验研究了SEN壁面和钢液中氧化铝夹杂物荷电性。结果表明:连铸过程中SEN荷负电,并随着拉坯速度的提高荷电量增大;钢液中氧化铝夹杂物荷正电,静电力为氧化铝夹杂物向SEN壁面迁移的重要驱动力;高温模拟试验和实际工况试验均表明氧化铝夹杂物会向阴极移动并附着在Al_(2)O_(3)-C材料上,并随着电场强度的增大,附着物厚度增厚。本工作揭示了SEN氧化铝结瘤新机理,为后续研究提供了方向。Introduction In the continuous casting of aluminum-killed steel,alumina(Al_(2)O_(3))clogging frequently forms on the submerged entry nozzle(SEN)inner wall,causing SEN clogging.SEN clogging has several negative influences,i.e.,flow field instability,reduced continuous casting efficiency,deteriorated billet quality,decreased quality of produced steel,and even interruption of continuous casting.The SEN clogging problem in the continuous casting of aluminum-killed steels has attracted much attention in metallurgy and refractory materials.Although many anti-clogging measures are proposed,the SEN clogging problem has not been solved yet.The main reason is that the mechanism of SEN clogging is still unclear.The clogging of SEN is mainly caused by the movement and adhesion of inclusions in molten steel to the SEN wall.It is thus necessary to clarify the mechanism of SEN clogging,especially force condition of inclusions in molten steel.Recent studies indicate that there is a correlation between the movement of oxide inclusions in molten metal and an applied electric field.The movement of inclusions under the action of electric field force is an important factor in SEN clogging.An effective way to solve SEN clogging problem is to analyze the effect of inclusions in refractory materials and molten steel from the perspective of electric field.In this paper,the charge of Al_(2)O_(3) inclusions in SEN wall and molten steel during continuous casting was investigated to reveal the mechanism of SEN clogging and blockage,and to develop a technology for preventing alumina clogging in SEN.This work can provide a theoretical and technical support for solving the technical problems of SEN clogging in iron and steel industry.Methods The powerful mixers(Erich Co.,Germany)were used for mixing.The blast drying oven was used to control the volatile matter of the material.The samples were prepared by four-column hydraulic press and isostatic press.The samples were heat treated under the condition of carbon embedded(i.e.,850℃ for 6 h).The

关 键 词：浸入式水口 氧化铝 结瘤堵塞 荷电 外加电场 

分 类 号：TQ175[化学工程—硅酸盐工业]