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Solvometallurgy is an innovative approach to extract metals from primary and secondary resources. It relies on the use of eco-friendly and cost-effective nonaqueous solvents, such as deep eutectic solvents (DESs), to extract and recover metals of interest, while promising to minimize water consumption and the use of harsh acid/base chemicals in processing circuits. This work presents the outcome of a series of 24 h solvometallurgical leaching tests using waste printed circuit boards (PCBs) at a mild temperature of 65 °C. Four DESs were investigated, containing choline chloride (ChCl) as the hydrogen bond acceptor (HBA), ethylene glycol (EG), malonic acid (MA), acetic acid (AA), and levulinic acid (LA) as the hydrogen bond donors (HBDs), and iodine (I2). Among the DESs tested, ChCl:AA:I2 emerged as the most effective and selective solvent, extracting 94% of Cu, 78% of Ni, and 88% of Au, with 37% and 6% co-extraction of Fe and Al, respectively.

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Solvometallurgical Extraction of Critical Strategic and Precious Metals from Waste Printed Circuit Boards

  • 会议论文

  • 发表日期：

    2025年

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  • Sara Saffaj,
  • Diego Mantovani,
  • Georgios Kolliopoulos

摘要

Solvometallurgy is an innovative approach to extract metals from primary and secondary resources. It relies on the use of eco-friendly and cost-effective nonaqueous solvents, such as deep eutectic solvents (DESs), to extract and recover metals of interest, while promising to minimize water consumption and the use of harsh acid/base chemicals in processing circuits. This work presents the outcome of a series of 24 h solvometallurgical leaching tests using waste printed circuit boards (PCBs) at a mild temperature of 65 °C. Four DESs were investigated, containing choline chloride (ChCl) as the hydrogen bond acceptor (HBA), ethylene glycol (EG), malonic acid (MA), acetic acid (AA), and levulinic acid (LA) as the hydrogen bond donors (HBDs), and iodine (I2). Among the DESs tested, ChCl:AA:I2 emerged as the most effective and selective solvent, extracting 94% of Cu, 78% of Ni, and 88% of Au, with 37% and 6% co-extraction of Fe and Al, respectively.