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<p>Platinum group metals (PGMs) are known as the “vitamins of modern industry.” The reapplication of PGMs in recycled spent automobile catalysts (SAC) is a key strategy to solve the imbalance between supply and demand of PGM resources. Aiming at the defects of high melting temperature or low recovery rate of the single capture method, an Fe–Cu bimetallic synergistic capture technology was proposed, which realized low-temperature synergistic capture by using the low melting point characteristics and physical properties of the Fe–Cu alloy. The experimental results indicate that the recovery rate of Fe–Cu synergistic capture can be increased from 97.2% of single Fe/Cu capture to 99.3% at 1400&#xa0;℃, and it is found that the change of the capture system leads to a significant difference in the quality of the Me-PGMs alloy. According to this phenomenon, the internal sedimentation–crystallization mechanism is clarified. The addition of Cu is more conducive to promoting the aggregation of the bottom alloy, which has practical significance for improving the separation efficiency of slag and metal in industrial production. The establishment of the phase field model clarified that the formation of the core–shell structure Fe–Cu-PGMs conforms to the phase separation mechanism. The multi-parameter coupling law for temperature, slag phase composition, capture agent addition amount, and holding time was systematically studied. The optimal test parameters in the feasible region were mCaO/mAl₂O₃ = 1.49, capture agent addition amount of 10 wt.%, and holding at 1400&#xa0;℃ for 60&#xa0;min. The results show that the development of a multi-metal synergistic effect can break through the technical bottlenecks of the existing single-metal capture system and provide theoretical support for the efficient recovery and process economic optimization of PGMs in industrial scenarios.</p> Graphical Abstract <p></p>

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Iron–Copper Synergistic Low-Temperature Melting Capture Technology Improves the Recovery Rate of Platinum Group Metals in Spent Automobile Catalysts

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Chao Sun,
  • Yong Li,
  • Qingfeng Xiong,
  • Han Yang,
  • Jibiao Han,
  • Wangrui Ma,
  • Rude Lian

摘要

Platinum group metals (PGMs) are known as the “vitamins of modern industry.” The reapplication of PGMs in recycled spent automobile catalysts (SAC) is a key strategy to solve the imbalance between supply and demand of PGM resources. Aiming at the defects of high melting temperature or low recovery rate of the single capture method, an Fe–Cu bimetallic synergistic capture technology was proposed, which realized low-temperature synergistic capture by using the low melting point characteristics and physical properties of the Fe–Cu alloy. The experimental results indicate that the recovery rate of Fe–Cu synergistic capture can be increased from 97.2% of single Fe/Cu capture to 99.3% at 1400 ℃, and it is found that the change of the capture system leads to a significant difference in the quality of the Me-PGMs alloy. According to this phenomenon, the internal sedimentation–crystallization mechanism is clarified. The addition of Cu is more conducive to promoting the aggregation of the bottom alloy, which has practical significance for improving the separation efficiency of slag and metal in industrial production. The establishment of the phase field model clarified that the formation of the core–shell structure Fe–Cu-PGMs conforms to the phase separation mechanism. The multi-parameter coupling law for temperature, slag phase composition, capture agent addition amount, and holding time was systematically studied. The optimal test parameters in the feasible region were mCaO/mAl₂O₃ = 1.49, capture agent addition amount of 10 wt.%, and holding at 1400 ℃ for 60 min. The results show that the development of a multi-metal synergistic effect can break through the technical bottlenecks of the existing single-metal capture system and provide theoretical support for the efficient recovery and process economic optimization of PGMs in industrial scenarios.

Graphical Abstract