In order to clarify the degradation behavior of MgO refractory by BOF slags containing CaCl₂, some laboratory experiments were carried out at steelmaking temperature to simulate the interaction between the refractory and slags. Three slag systems (viz. CaCl₂-free, CaCl₂-added and CaF₂-added slags) were considered in this study. It is found that a solid solution magnesiowustite (MW) layer can be observed at the boundary between the refractory and the slags, and its thickness increases with time. In the MW layer, MgO diffuses to the slag, while FeO diffuses oppositely to the refractory. The dissolution of MgO refractory into the CaCl₂-added slags reduces the solubility of CaCl₂ in the slags, and causes a CaCl₂ layer precipitated near the MW layer. The CaCl₂ layer acts as a barrier to hinder the diffusion of MgO and FeO, thus leading to a thinner MW layer and a lower MgO content in the slags in contrast to the CaCl₂-free slag. In the case of the CaF₂-added slag, the thickest MW layer and the highest MgO content are obtained. So, the addition of CaCl₂ into BOF slag would weaken the degradation of MgO refractory, while the addition of CaF₂ plays an opposite role.

为了阐明含 CaCl ₂的转炉渣对 MgO 耐火材料的降解行为，在炼钢温度下进行了一些实验室实验，以模拟耐火材料与渣之间的相互作用。本研究考虑了三种炉渣系统（即不含CaCl ₂、添加CaCl ₂和添加CaF ₂的炉渣）。研究发现，在耐火材料和炉渣的交界处可以观察到固溶镁镁石（MW）层，其厚度随着时间的推移而增加。在MW层中，MgO向熔渣扩散，而FeO向耐火材料的相反方向扩散。MgO 耐火材料溶解到添加 CaCl ₂的炉渣中降低了 CaCl 的溶解度₂，并导致在MW层附近析出CaCl ₂层。CaCl ₂层充当阻碍MgO和FeO扩散的屏障，因此与不含CaCl ₂的熔渣相比，导致熔渣中更薄的MW层和更低的MgO含量。在添加CaF ₂的炉渣的情况下，获得了最厚的MW层和最高的MgO含量。因此，在转炉渣中添加CaCl _{2会减弱MgO耐火材料的降解，而添加CaF 2}则起到相反的作用。