Presentation Information
[2K0201-07-04]Evaluation of Mineral Processing Methods as Pretreatment for Gold Leaching from Roasted Waste Printed Circuit Boards
○Melito Salvador Oculares1[Student presentation: Doctoral course], Ilhwan Park2, Ryoei Watanabe1, Mayumi Ito2 (1. Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Japan、2. Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Japan)
Chairperson: 伊藤 真由美（北海道大学）、パク イルファン（北海道大学）
Keywords:
e-waste,roasted waste printed circuit boards,mineral processing,gold concentration
Declining gold grades in natural ores pose challenges to future gold supply and are expected to increase the volume of mine tailings, potentially leading to greater environmental impacts. These challenges highlight the need to identify viable secondary sources of gold. Over the past two decades, electronic waste has been recognized as a valuable secondary resource for gold. Its utilization supports urban mining and promotes a circular economy through material recycling. Furthermore, the application of sustainable hydrometallurgical techniques for gold extraction from roasted waste printed circuit boards (WPCBs) can further strengthen circular economy initiatives.
This study evaluates the role of mineral processing as an effective pretreatment step prior to the hydrometallurgical extraction of gold from roasted WPCBs. Several techniques—including Dense Medium Separation (DMS), shaking table, Knelson concentrator, Falcon concentrator, and froth flotation—were investigated across the feed particle size ranges where each method typically operates most effectively. Both feed and products were characterized using XRF, SEM-EDX, and ICP-AES. The results indicate that while these methods present challenges for the selective concentration of gold from roasted WPCBs, they are effective at removing calcium- and silicon-bearing materials, which constitute the primary gangue. These findings suggest that, although the processes successfully achieve gangue rejection, further modifications are required to enhance gold enrichment ratios.
This study evaluates the role of mineral processing as an effective pretreatment step prior to the hydrometallurgical extraction of gold from roasted WPCBs. Several techniques—including Dense Medium Separation (DMS), shaking table, Knelson concentrator, Falcon concentrator, and froth flotation—were investigated across the feed particle size ranges where each method typically operates most effectively. Both feed and products were characterized using XRF, SEM-EDX, and ICP-AES. The results indicate that while these methods present challenges for the selective concentration of gold from roasted WPCBs, they are effective at removing calcium- and silicon-bearing materials, which constitute the primary gangue. These findings suggest that, although the processes successfully achieve gangue rejection, further modifications are required to enhance gold enrichment ratios.
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