改质剂对LATS精炼钢包渣粘度的影响

Effect of Additives on Viscosity of LATS Refining Ladle Slag

为减少LATS合金化精炼钢包浸渍罩粘渣,研究了LATS精炼前后钢包渣粘度的变化,并分别用CaO+CaF2,CaO+B2O3及Li2O作为钢包渣的改质剂来降低渣粘度.采用旋转柱体法的粘度测试结果表明,LATS合金化精炼钢包渣的粘度高及LATS处理后渣的粘度进一步升高是造成浸渍罩粘渣的主要原因之一.实验所用3种改质剂均能有效降低钢包渣的粘度.在1500℃无改质剂时LATS处理后钢包渣粘度为6Pa-s,当加入10%CaO+CaF2后渣粘度低于3Pa-s,而加入10%CaO+B2O3或加入4%Li2O都可使渣粘度低于2Pa-s.

To avoid slag sticking onto the ladle snorkel during the process of ladle alloying treatment station （LATS）, the variation of the ladle slag viscosity before and after LATS refining process was studied. The additives including CaO＋CaF2, CaO＋B2O3 and Li2O were employed to decrease the viscosity of ladle slag. The rotary cylinder method was adopted in the viscosity testing experiments. The results showed that the viscosity of ladle slag was very high and further increased after LATS refining process, which was one of main reasons of slag sticking onto the snorkel. All the three kinds of additives employed in this study could decrease the viscosity of ladle slag remarkably. At 1500 ℃, the viscosity of ladle slag without additives is 6 Pa.s. By adding 10%（ω） CaO＋CaF2, the viscosity was decreased lower than 3 Pa.s. Whereas by adding 10%（ca） CaO＋B2O3 or 4%（Ca） Li2O, the viscosity was lower than 2 Pa.s.