Abstract In this study, a 70% H2–30% N2 mixture was used to simulate waste cooking oil pyrolysis gas products for reduction of copper slag. The microstructure of slag before and after reduction was analyzed, and the distribution characteristics of copper and iron components during the reduction process were evaluated. The results show that there is always a sedimentation behavior of the matte in the slag during the cleaning process. The residual matte in the cleaned slag is mainly related to chemically dissolved copper. A clear layering was observed between slag and matte after the reduction process. These findings provide support for the recovery of matte from copper slag using waste cooking oil as a green reductant.

中文翻译：

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铜渣氢还原铜、铁成分分布

摘要 在这项研究中，70% H2–30% N2 混合物被用来模拟废食用油热解气体产品以减少铜渣。分析还原前后炉渣的显微组织，评价还原过程中铜、铁成分的分布特征。结果表明，在清洗过程中，炉渣中的锍始终存在沉淀行为。清洗后的渣中残留的锍主要与化学溶解的铜有关。在还原过程之后，在炉渣和锍之间观察到清晰的分层。这些发现为使用废食用油作为绿色还原剂从铜渣中回收锍提供了支持。