CaO-Al_2O_3基精炼渣对钢液脱氧的影响

Deoxidation of Molten Steel with CaO-Al_2O_3 Based Refining Slag

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 deoxidization of molten steel with CaO-Al 2O 3 based refining slag was studied by methodology of quadratic orthogonal regression. The experimental results showed that the deoxidization equilibration time is 20-30 min and the equilibrium oxygen content is 0.000 8 %-0.001 2 %. The equilibrium total oxygen content was obtained when the refining slag and molten steel were equilibrium. The relationship between total oxygen content and optical alkalinity, Al 2O 3 content, CaF 2 content in the refining slag was obtained. The results showed that the total oxygen content linearly decreases with the increase of optical alkalinity and increases with the increase of the Al 2O 3 content when the deoxidizer is aluminium. The total oxygen content increases firstly, and then decreases when the CaF 2 content increases. The optimum composition of the refining slag is : CaO 57.29 %, Al 2O 3 9 %, MgO 10 %, SiO 2 8.71 % and CaF 2 15 %.