MgO含量对铝镁质浇注料性能的影响

Effect of MgO content on properties of Al_2O_3-MgO castable

借助ＳＥＭ和ＥＤＡＸ分析等手段研究了ＭｇＯ含量对铝镁质脱硅出铁沟浇注料性能的影响。结果表明：ＭｇＯ含量（质量分数，下同）提高至３％，能显著地提高浇注料对脱硅剂的抗渗透性能，这主要是由于浇注料中反应生成的 ＭｇＡｌ２Ｏ３能大量吸收脱硅剂中的ＦｅＯ（Ｆｅ２Ｏ３），形成尖晶石固溶体，引起熔渣粘度增大；但生成的ＭｇＡｌ２Ｏ３量过多时，会引起浇注料的组织结构疏松，降低浇注料的抗渣性能。浇注料中适宜的ＭｇＯ含量为３％－６％。

The effect of MgO content on the properties of Al2O3-MgO castable was studied by SEM and EDAX. The results show that MgO content plays an important role on the improvement of penetration resist- ance to desiliconizer. When the MgO content reaches 3% (mass percent) ,the penetration resistance is improved greatly because the spinel formed absorbs FeO(Fe2O3) in desiliconizer and increases viscosity of slag. However, the slag resistance of AI2O3 -MgO castable decreases when the MgO content is more than 6% because more pores form by expansion due to the formation of spinel. The appropriate content of MgO may be from 3% to 6% .