Process imrpovement on recovery of raw materials from multilayer composites
Вантажиться...
Дата
2025
Науковий керівник
Назва журналу
Номер ISSN
Назва тому
Видавець
КПІ ім. Ігоря Сікорського
Анотація
At end of life, waste PCBs (WPCBs) represent both a valuable resource—containing copper, nickel, precious metals, and polymeric materials—and an environmental hazard if landfilled or incinerated. This work develops and optimizes a modular, closed-loop recycling line that (1) delaminates epoxy resin from fiberglass and embedded metal via dimethyl sulfoxide (DMSO) extraction, comparing conventional thermal swelling with microwave-assisted processing to maximize resin yield, preserve fiber integrity, and assess solvent recyclability; (2) mills the residual PCB fragments under a design-of-experiments framework to tune particle size distribution (2–10 mm) and energy use, including evaluation of process-control additives; (3) fractionates milled material through sequential magnetic, eddy-current, electrostatic, and density separation, optimizing separation thresholds and recovering ferrous, non-ferrous, and non-metallic streams; (4) conducts hydrometallurgical extraction on the mixed metal fraction, including alkali pre-treatment, acid leaching (with oxidant enhancement), solvent-extraction, and electrowinning to produce high-purity metal products; and (5) scales the optimized processes from laboratory (2 L) to pilot (200 L) stirred reactors under geometric similitude. Finally, mass and energy balances, closed-loop solvent and water recycling. Key technical uncertainties—including solvent–resin selectivity, milling energy–liberation trade-offs, leaching kinetics in complex residues, scale-up hydrodynamics, and solvent recovery losses—are systematically investigated. The resulting platform offers a viable path toward circular, sustainable PCB recycling with minimized waste and maximized resource recovery.
Опис
Ключові слова
circular economy, organic extraction, PCB recycling, hydrometallurgical extraction, prototype design, циркулярна економіка, органічна екстракція, переробка друкованих плат, гідрометалургійна екстракція, проєктування прототипу
Бібліографічний опис
Miliauskas, G. Process imrpovement on recovery of raw materials from multilayer composites / Gytis Miliauskas, Gintaras Denafas // Матеріали XХV Міжнародної науково-практичної конференції «Екологія. Людина. Суспільство» пам’яті д-ра Дмитра СТЕФАНИШИНА (12 червня 2025 р., м. Київ, Україна). – Київ : КПІ ім. Ігоря Сікорського, 2025. – С. 253-259. – Бібліогр.: 10 назв.