高铝钢精炼渣的热力学计算与分析

为了在高铝钢中得到最低的溶解氧含量,必须找到CaO-Al2O3-MgO体系中Al2O3活度最低点的位置。因此,利用炉渣结构的共存理论,结合CaO-Al2O3-MgO相图,利用Matlab软件计算了CaO-Al2O3-MgO体系中Al2O3活度。通过对不同模型计算出的CaO-Al2O3渣系中Al2O3活度值比较,表明其变化趋势基本相同。由共存理论对CaO-Al2O3-MgO体系中Al2O3活度进行计算得到,在一定的MgO含量下,随着CaO含量增加,炉渣中Al2O3活度降低;在一定的CaO含量下,随着MgO含量增加,炉渣中Al2O3活度降低,且Al2O3活度最低值在CaO和MgO均达饱和的区域。

Thermodynamic study on refining slags of high aluminum steel

In order to get the lowest dissolved oxygen content in high-aluminum steel, the location with the lowest Al₂O₃ activity in CaO-Al₂O₃-MgO system must be found. In this article, with the help of Matlab software, Al₂O₃ activity in CaO-Al₂O₃-MgO system is calculated, in compliance with the coexistence theory of slag structure and the CaO-Al₂O₃-MgO diagram. With comparison between Al₂O₃ activities in CaO-Al₂O₃ slag calculated in different Mathematical Models, a basically same change trend is found. Through calculation, if the content of MgO is certain, when the content of CaO increases, the Al₂O₃ activity in slag reduces; if the content of CaO is certain, when the content of MgO increases, the Al₂O₃ activity in slag reduces, and the lowest Al₂O₃ activity is reached in the section where both CaO and MgO contents are saturated.