通过物理模拟试验,研究分析了底吹氩精炼钢包内夹杂物去除机理以及吹氩量对其的影响规律.结果表明:钢包中夹杂物的上浮主要是通过上升的钢液流携带,底吹氩量对夹杂物在钢包表面的钢-渣界面去除行为存在重要影响.吹氩量较小时,钢-渣界面稳定,夹杂物在浮力、毛细作用力等共同作用下穿过平坦的钢-渣界面而被吸收;吹氩量较大时,钢-渣界面波动大,渣眼周围发生卷渣,夹杂物被卷入的液滴吸收,随液滴进入渣层;吹氩量大,渣眼周围形成渣泡,夹杂物被渣泡吸收,随渣泡进入渣层.吹氩量达到一定时,夹杂物被钢-渣界面的吸收成为其被去除的限制性环节,且吹氩量较大时夹杂物去除效果最差,为实际吹氩精炼过程吹气量的控制提供了指导.
Based on a physical modeling of argon-stirred refining ladle,the effect of argon flow rate on the removal of non-metallic inclusions and its removal mechanism were studied. The results indicated that the floatation of inclusions to the steel-slag interface was mainly due to the rising movement of liquid steel. Argon blowing rate was one of the most important factors to remove inclusions at the steel-slag interface. When the argon flow rate was relatively low,inclu-sions would be absorbed at the steady steel-slag interface with the help of buoyancy force and other forces. With the in-crease of argon flow rate,a fluctuant steel-slag interface occurred,and some slag droplets were entrapped into steel close to the open eye. Some inclusions would be captured by these slag droplets and then float up into top slag. When the gas flow rate was high enough,some slag droplets containing some gas bubbles formed. inclusions were captured by these slag bubbles and then removed into top slag as well. When the gas flow rate increased to a certain value,the ab-sorption of inclusions at the steel-slag interface became the controlling step of inclusion removal,and the removal result became worse. The results of present study could provide a guidance for the control of argon flow during industrial refin-ing process.
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