Dolomite refractories are widely used in the refining process of clean steel and are considered potential sources of Mg and Ca that form MgO·Al₂O₃ spinel and CaO-containing inclusions. In this study, dolomite refractories were immersed into Al-killed molten steel with either 0.05% Al or 0.25% Al. The dissolution behavior of Mg and Ca from the dolomite refractory was studied, and the inclusion transformation behavior was observed. The results revealed that MgO in the dolomite refractory was reduced by Al in the molten steel, and the Mg content depended on the Al content. On the contrary, CaO barely dissolved into the molten steel even though the Al content increased. After immersion in both the low Al (0.05% Al) and high Al (0.25% Al) steels, an interfacial layer consisting of solid MgO and liquid phase CaO–Al₂O₃–MgO was formed on the surface of the rods. The initial Al₂O₃ inclusions gradually changed into Al₂O₃ saturated MgO–Al₂O₃ spinel after 60 min in low-Al steel; but were quickly transformed into MgO-saturated MgO–Al₂O₃ spinel in high Al steel. No CaO-containing inclusions were detected in the molten steel regardless of the immersion time and Al content.

白云石耐火材料广泛用于洁净钢的精炼过程，被认为是形成 MgO·Al ₂ O ₃的 Mg 和 Ca 的潜在来源尖晶石和含 CaO 的夹杂物。在这项研究中，将白云石耐火材料浸入含 0.05% 铝或 0.25% 铝的铝镇静钢水中。研究了镁、钙在白云石耐火材料中的溶解行为，观察了夹杂物的转变行为。结果表明，白云石耐火材料中的MgO被钢水中的Al还原，Mg含量取决于Al含量。相反，即使Al含量增加，CaO也几乎不溶解到钢水中。浸入低Al（0.05% Al）和高Al（0.25% Al）钢后，在棒材表面形成由固体MgO和液相CaO-Al ₂ O ₃ -MgO组成的界面层。初始Al ₂ O ₃低Al钢中夹杂物在60 min后逐渐转变为Al ₂ O ₃饱和MgO-Al ₂ O ₃尖晶石；但在高铝钢中迅速转化为 MgO 饱和的 MgO-Al ₂ O ₃尖晶石。无论浸渍时间和Al含量如何，在钢水中均未检测到含CaO夹杂物。