Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag,Steel Research International

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Corrosion Behavior of Lightweight MgO in High Basicity Tundish Slag
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-27 , DOI: 10.1002/srin.202100010
Chong Tan ₁ , Yu Liu ₁ , Guangqiang Li _{1,

2} , Cheng Yuan ₂ , Yufeng Tian ₃ , Yongshun Zou ₁ , Ao Huang ₁

Affiliation

Demand for energy saving in steelmaking process, lightweight refractories have attracted great attentions for the excellent thermal insulation. Herein, the corrosion behavior of the lightweight magnesia in the high basicity tundish slag is explored, and compared with that of fused magnesia. The results show that the impurities in the fused magnesia cause more dissolution of magnesia into slag after 60 min. Different from fused magnesia, the penetration layer is found in the lightweight magnesia, where the intercrystalline CaZrO₃–ZrO₂ phases are dissolved by the slag. The micropores in the lightweight magnesia provide passages for slag infiltration, but also accelerate the supersaturation of slag in refractory and impede the mass transfer. Furthermore, the residual CaZrO₃–ZrO₂ phases in transition layer hinder the further slag infiltration. After 60 min holding, the MgO content in molten slag contacted with lightweight magnesia is lower, implying that the lightweight magnesia is the promising refractory for tundish lining.

中文翻译：

轻质MgO在高碱度中间包渣中的腐蚀行为

炼钢过程中对节能的需求，轻质耐火材料以其优异的保温性能备受关注。在此，探讨了轻质氧化镁在高碱度中间包渣中的腐蚀行为，并与电熔氧化镁的腐蚀行为进行了比较。结果表明，电熔氧化镁中的杂质在 60 分钟后会导致氧化镁更多地溶解到炉渣中。与电熔氧化镁不同，渗透层存在于轻质氧化镁中，其中晶间 CaZrO ₃ –ZrO ₂相被炉渣溶解。轻质氧化镁中的微孔为熔渣渗透提供了通道，但也加速了耐火材料中熔渣的过饱和并阻碍了传质。此外，残留的 CaZrO ₃过渡层中的-ZrO ₂相阻碍了熔渣的进一步渗透。保温 60 分钟后，与轻质氧化镁接触的熔渣中 MgO 含量较低，表明轻质氧化镁是中间包衬里的有前途的耐火材料。

更新日期：2021-04-27

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