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通过理论计算和分析,研究了夹杂物颗粒在钢-渣界面处夹杂物去除层内的运动特性及去除率。结果表明:在夹杂物去除层内,Al2O3夹杂物颗粒的布朗扩散上浮临界尺寸为1.33μm,直径小于临界尺寸的夹杂物颗粒很难上浮去除;布朗碰撞的优势区域主要是直径为2.5μm以下的夹杂物颗粒之间以及直径为2.5～5μm夹杂物颗粒与0.5μm以下的微小颗粒之间的碰撞;直径为20～150μm的夹杂物颗粒在钢-渣界面去除层中9min内很容易完全上浮去除,而直径小于10μm的夹杂物颗粒去除率很低且升高缓慢,是提高钢液洁净度的主要控制对象。
Through theoretical calculation and analysis, the movement characteristics and removal rate of inclusions in inclusions at steel-slag interface were studied. The results show that in the inclusions removal layer, the inclusions whose Al2O3 inclusions have a Brownian diffusion of 1.33μm and whose diameter is smaller than the critical size are difficult to be removed by floating diffusion. The dominant regions of Brownian collision are mainly those with a diameter of 2.5μm or less Collision between inclusions and between 2.5 ~ 5μm inclusions and fine particles less than 0.5μm. The inclusions with diameter of 20 ~ 150μm are easy to float completely within 9min in the steel-slag interface removal layer , While the diameter of inclusions less than 10μm particle removal rate is low and slow increase, is to improve the cleanliness of the main control object of the liquid steel.