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在 Mo Si2 炉上用二次正交回归实验方法进行了 Ca O- Al2 O3 基精炼渣对钢液脱氧影响的实验研究。发现精炼渣与钢中溶解氧的平衡时间为 2 0～ 30 min、平衡溶解氧含量为 0 .0 0 0 8%～0 .0 0 12 %,并得到了精炼渣在不同成分下的钢液全氧含量。另外 ,通过二次正交回归处理 ,得到了钢液全氧含量与精炼渣的光学碱度、渣中 Al2 O3 含量和 Ca F2 含量之间的关系式 ,并发现如下规律 :随着精炼渣光学碱度的提高 ,钢液全氧含量几乎呈直线减小 ;在用铝脱氧的条件下 ,钢液全氧含量基本上随精炼渣中 Al2 O3 含量的增加而增大 ;随着精炼渣中 Ca F2 含量的增加 ,钢液全氧含量呈先增大、后减小的趋势。本实验条件下最佳的渣系组成为 Ca O 5 7.2 9%,Al2 O3 9%,Mg O 10 %,Si O28.71%,Ca F2 15 %。
The influence of Ca-Al 2 O 3 -based refining slag on the deoxidation of molten steel was investigated by means of quadratic orthogonal regression on Mo Si 2 furnace. It is found that the equilibrium time between dissolved slag and dissolved oxygen in steel is 20 ~ 30 min, the equilibrium dissolved oxygen content is 0.00008% ~ 0.012%, and the molten steel with different composition of refined slag is obtained Total oxygen content. In addition, through the quadratic orthogonal regression, the relationship between the total oxygen content of molten steel and the optical basicity of slag, the content of Al 2 O 3 and the content of Ca 2 O in the slag was obtained, and the following rule was found: Alkalinity increased, the oxygen content of molten steel decreased almost linearly; with aluminum deoxidation conditions, the oxygen content of molten steel with the refining slag Al 2 O 3 content increases; with the refining slag Ca With the increase of F2 content, the oxygen content of molten steel first increases and then decreases. The best slag system under the experimental conditions is CaO 5 7.2 9%, Al 2 O 3 9%, MgO 10%, Si O 28.71% and Ca F2 15%.