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对超低氧试验钢精炼过程中镁铝尖晶石的形成机制和生成热力学计算分析表明:1873K时,MgO-Al2O3二元系夹杂物中MgO的质量分数超过17%时就能生成镁铝尖晶石;采用高碱度、w((CaO))/w((Al2O3))≈1、强还原性精炼顶渣对铝终脱氧钢液进行LF精炼时,在LF精炼中前期就实现Al2O3向MgO·Al2O3尖晶石的转变;钢液中的镁则是实现Al2O3向MgO·Al2O3尖晶石转变的中介和桥梁。而钢中镁含量是由酸溶铝控制的。因此,保持钢液中足够的铝含量是镁铝尖晶石生成的前提。生产过程中,当钢液的w([Al])达到0.03%时,w([Mg])只需要1.32×10-7以上就能生成MgO·Al2O3尖晶石。
The forming mechanism and formation thermodynamics of Mg-Al spinel during the process of refining of ultra-low oxygen steel show that MgO-Al2O3 spinel can be formed when the mass fraction of MgO in MgO-Al2O3 binary system exceeds 18% at 1873K In the process of LF refining of aluminum final deoxidation molten steel with high basicity, w ((CaO)) / w ((Al2O3)) ≈1, MgO · Al2O3 spinel transformation; magnesium in the molten steel is to achieve Al2O3 to MgO · Al2O3 spinel intermediates and bridges. The magnesium content in steel is controlled by acid-soluble aluminum. Therefore, to maintain adequate aluminum content in molten steel is the prerequisite for the formation of magnesium aluminate spinel. In the production process, when w ([Al]) reaches 0.03%, w ([Mg]) only needs 1.32 × 10-7 or more to produce MgO · Al2O3 spinel.