In some applications, deep desulfurization and deoxidation of steels without the use of aluminum are required, using Si as a deoxidant instead, with double-saturated slags in the CaO-SiO₂-CaF₂-MgO system. This work studied the desulfurization and nonmetallic inclusion evolution for the system using an induction furnace and compared the results with FactSage kinetic simulations. Steel samples were taken from the steel melt and analyzed with ICP-MS and combustion analysis for chemistry, and SEM/EDS for nonmetallic inclusion quantity, size, and composition. The results indicate that the steel was deeply desulfurized, with a final sulfur partition coefficient of 580; MgO was reduced from the slag, yielding dissolved [Mg] that transformed liquid Mn–silicate inclusions into forsterite and MgO. Intentional reoxidation of the melt with oxidized electrolytic iron demonstrated a significant concentration of dissolved [Mg] in the steel, by the formation of additional forsterite and MgO upon reoxidation.

中文翻译：

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无铝炼钢：硅镇静钢与CaO-SiO2-CaF2-MgO渣接触的脱硫及非金属夹杂物演化

在某些应用中，需要在不使用铝的情况下对钢进行深度脱硫和脱氧，使用 Si 作为脱氧剂，在 CaO-SiO ₂ -CaF _{2 中}使用双饱和炉渣-MgO 系统。这项工作使用感应炉研究了系统的脱硫和非金属夹杂物演化，并将结果与​​ FactSage 动力学模拟进行了比较。从钢熔体中取出钢样品，用 ICP-MS 和燃烧分析进行化学分析，用 SEM/EDS 分析非金属夹杂物的数量、尺寸和成分。结果表明，该钢经过深度脱硫，最终硫分配系数为580；MgO 从炉渣中被还原，产生溶解的 [Mg]，将液态锰硅酸盐夹杂物转化为镁橄榄石和 MgO。通过在再氧化时形成额外的镁橄榄石和 MgO，有意用氧化的电解铁对熔体进行再氧化表明钢中溶解的 [Mg] 浓度很高。