In view of the non-renewable reductant resources and carbon neutralization in the process of copper slag cleaning in an electric furnace, this study proposed to use waste cooking oil as reductant to replace fossil energy. Combined with the phase equilibrium theory and experimental results, the harm of excessive magnetite in the copper smelting slag to the cleaning process was clarified. The reduction thermodynamics of magnetite by using WCO is analyzed. A series of copper slag cleaning experiments with different WCO dosages along with various temperatures and settling durations was systematically carried out in a laboratory-scale electric furnace. The distribution of matte particles in each slag layer after cleaning was investigated in detail, which indicates that the copper content in the upper slag layer can be reduced to 0.56 wt pct via WCO reduction, realizing the green cleaning of copper slag.

中文翻译：

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废食用油在电炉中炼铜除渣

针对电炉铜渣清理过程中还原剂资源不可再生和碳中和的问题，本研究提出以废食用油作为还原剂替代化石能源。结合相平衡理论和实验结果，阐明了铜冶炼渣中磁铁矿过量对清洗过程的危害。分析了WCO对磁铁矿的还原热力学。在实验室规模的电炉中系统地进行了一系列不同 WCO 用量、不同温度和沉降时间的铜渣清洗实验。详细考察了清洗后各渣层中无光泽颗粒的分布情况，表明上渣层的铜含量可以降低到0。