The removal of sulfur impurities from refining slag by external electric field is an important research direction of metallurgical solid waste recycling. In this study, Fourier transform infrared spectrometer, Raman spectroscopy, X-ray diffraction analyzer, rotating viscometer, and four-electrode conductivity tester were used to obtain the relationship between composition, structure, and properties of CaO–SiO₂–Al₂O₃–MgO–CaF₂ refining slag system. The effect of slag properties on the transfer efficiency of sulfur element enhanced by electric field was analyzed based on pulsed electric field experiment. The results showed that, when CaO/Al₂O₃ ratio changed from 1.2 to 2.0, the depolymerization of slag network structure and the disappearance of high-melting-point phases made the viscosity to decrease and the electrical conductivity to increase. When the MgO content changed from 4 to 12 wt%, under the influence of slag network depolymerization and the precipitation of high-melting-point phases, the viscosity decreased first and then increased, and the electrical conductivity trend was opposite. With the increase of F⁻ content in the range of 3–7 wt%, the viscosity decreased first and then increased due to the depolymerization of slag network structure and the bonding of excess F⁻ irons, and the electrical conductivity trend was opposite. According to the sulfur migration in refining slag, 0.5 h was determined as the suitable time parameter of applied electric field. When the voltage was 0–4 V, the electric field and the simplification of slag network structure can obviously promote the sulfur removal from slag. When the voltage was 6 V, the sulfur element in slag increased with the increase of CaO/Al₂O₃ ratio, and one reason was an increase in electrical resistance.

Graphical Abstract

中文翻译：

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典型成分对精炼渣理化性质的影响及电场增强硫迁移

外电场去除精炼渣中的硫杂质是冶金固废回收利用的重要研究方向。本研究采用傅里叶变换红外光谱仪、拉曼光谱仪、X射线衍射仪、旋转粘度计和四电极电导率测试仪，获得了CaO-SiO ₂ -Al ₂ O ₃的组成、结构和性能之间的关系。 -MgO-CaF ₂精炼渣系统。基于脉冲电场实验，分析了渣性质对电场增强硫元素转移效率的影响。结果表明，当 CaO/Al ₂ O ₃比例从1.2变为2.0，渣网结构解聚和高熔点相消失，使粘度降低，电导率增加。当MgO含量从4 wt%变化到12 wt%时，在渣网解聚和高熔点相析出的影响下，黏度先下降后上升，电导率趋势相反。随着 F ^{-含量在 3-7 wt% 范围内的增加，由于渣网结构的解聚和过量 F -}的结合，粘度先下降后上升。电导率趋势相反。根据精炼渣中硫的迁移情况，确定0.5 h为施加电场的合适时间参数。当电压为0~4 V时，电场和渣网结构的简化可以明显促进渣中硫的脱除。当电压为6 V时，渣中的硫元素随着CaO/Al ₂ O ₃比的增加而增加，其原因之一是电阻增加。

图形概要