Abstract

Slag–metal reaction experiments in MoSi₂ resistance furnace combined with electroslag remelting (ESR) experiments in ESR furnace are used to study the effect of slag on zirconium distribution in ESR ingot by establishing a new mass transfer model of slag–metal reaction. The mass transfer model consists of Al + Al₂O₃, Si + SiO₂, Zr + ZrO₂, and Fe + FeO systems based on the penetration and film theories. Both experimental and simulated results show that the returned slag (CaF₂:CaO:Al₂O₃:MgO:ZrO₂ = 57:20:16:3:3) combined with extra 4% Al₂O₃ added into molten slag in the first slag-temperature-rising period can control the zirconium in ESR ingot ranging from 0.35 to 0.40% and improve the homogeneous distribution of zirconium in ESR ingot. The returned slag of Exp.A containing low silica being used in Exp.C can not only contribute to the recycling of returned slag, but also improve the homogeneous distribution of Zr along the height of ESR ingot.

Graphical Abstract

中文翻译：

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含锆钢渣和电渣重熔生产工艺设计

摘要

通过建立新的渣-金属反应传质模型，利用MoSi ₂电阻炉中的渣-金属反应实验与ESR炉中的电渣重熔（ESR）实验，研究渣对ESR铸锭中锆分布的影响。基于渗透和薄膜理论，传质模型由Al + Al ₂ O ₃，Si + SiO ₂，Zr + ZrO ₂和Fe + FeO体系组成。实验和模拟结果均表明，返回的炉渣（CaF ₂：CaO：Al ₂ O ₃：MgO：ZrO ₂  = 57：20：16：3：3）与额外的4％Al ₂ O ₃结合在一起在第一炉渣温升期向熔渣中添加锆可以控制ESR铸锭中的锆含量在0.35％至0.40％之间，并改善ZSR在ESR铸锭中的均匀分布。Exp.C中使用的含有低二氧化硅的Exp.A的回流渣不仅可以促进回流渣的再循环，而且可以改善Zr沿ESR钢锭高度的均匀分布。

图形概要