The acceleration of the carburizing and melting processes in reduced iron is critical for reducing energy consumption and CO₂ emissions produced by the steel industry. The aims of the study were to clarify the carbon dissolution reactions and diffusion processes in molten slag. A combined approach utilizing Raman spectroscopy and XPS was employed to investigate the relationship between carbon-containing species and slag composition in the CaO–SiO₂–Al₂O₃ slag system. The Raman spectra indicated that carbon dissolved in slag in the form of carbides, carbonates, and graphitic structures. The proportion of carbide ions in the slag increased from 64.2% to 74.7%, and the proportion of graphitic structures decreased from 19.7% to 7.4% as the slag’s basicity increased. The carbon dissolution mechanism in slag involved the reaction of carbon with dissolved oxide ions and oxygen-containing anions in the slag. This formed carbon-containing species such as CO₃²⁻, C₂²⁻, and graphitic structures that diffused in the slag and subsequently underwent carburization and deposition at the iron interface.

加速还原铁的渗碳和熔化过程对于减少钢铁工业产生的能源消耗和CO ₂排放至关重要。该研究的目的是阐明熔渣中的碳溶解反应和扩散过程。采用拉曼光谱和 XPS 相结合的方法研究了 CaO-SiO ₂ -Al ₂ O ₃渣体系中含碳物质与渣成分之间的关​​系。拉曼光谱表明碳以碳化物、碳酸盐和石墨结构的形式溶解在炉渣中。随着炉渣碱度的增加，炉渣中碳化物离子的比例从64.2%增加到74.7%，石墨结构的比例从19.7%下降到7.4%。炉渣中碳的溶解机理涉及碳与炉渣中溶解的氧离子和含氧阴离子的反应。这形成了含碳物质，例如CO ₃ ²⁻、C ₂ ²⁻和石墨结构，它们在炉渣中扩散，随后在铁界面处发生渗碳和沉积。