Co-pyrolysis of waste printed circuit boards with iron compounds for Br-fixing and material recovery

Chen, Weifang; Shu, Yongkai; Li, Yonglun; Chen, Yanjun; Wei, Jianbo

doi:10.1007/s11356-021-15506-w

Cited by 25 publications

(4 citation statements)

References 36 publications

(29 reference statements)

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“…Furthermore, iron salts offer another solution for eliminating bromine and improving product quality. Results show that FeCl 2 not only suppresses the formation of organic bromides but also improves the cracking of macromolecules derived from waste PCBs pyrolysis . When loading FeCl 2 into the waste porous gasification slag, the large surface area of slag increases both contact time and area, thereby improving the debromination efficiency from 67.2% to 81.6% …”

Section: Recent Advancements In Thermochemical Treatmentsmentioning

confidence: 99%

“…Results show that FeCl 2 not only suppresses the formation of organic bromides but also improves the cracking of macromolecules derived from waste PCBs pyrolysis. 85 When loading FeCl 2 into the waste porous gasification slag, the large surface area of slag increases both contact time and area, thereby improving the debromination efficiency from 67.2% to 81.6%. 86 Another innovative "treating wastes with wastes" method is using electric arc furnace dust (EAFD), which contains multiple metallic elements, like zinc, lead, and iron.…”

Section: In Situ Catalytic Pyrolysismentioning

confidence: 99%

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Recent Advancements in Pyrolysis of Halogen-Containing Plastics for Resource Recovery and Halogen Upcycling: A State-of-the-Art Review

Ma,

Kumagai,

Saito

et al. 2024

Environ. Sci. Technol.

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Plastic waste has emerged as a serious issue due to its impact on environmental degradation and resource scarcity. Plastic recycling, especially of halogen-containing plastics, presents challenges due to potential secondary pollution and lower-value implementations. Chemical recycling via pyrolysis is the most versatile and robust approach for combating plastic waste. In this Review, we present recent advancements in halogen-plastic pyrolysis for resource utilization and the potential pathways from "reducing to recycling to upcycling" halogens. We emphasize the advanced management of halogen-plastics through copyrolysis with solid wastes (waste polymers, biomass, coal, etc.), which is an efficient method for dealing with mixed wastes to obtain high-value products while reducing undesirable substances. Innovations in catalyst design and reaction configurations for catalytic pyrolysis are comprehensively evaluated. In particular, a tandem catalysis system is a promising route for halogen removal and selective conversion of targeted products. Furthermore, we propose novel insights regarding the utilization and upcycling of halogens from halogen-plastics. This includes the preparation of halogen-based sorbents for elemental mercury removal, the halogenation−vaporization process for metal recovery, and the development of halogendoped functional materials for new materials and energy applications. The reutilization of halogens facilitates the upcycling of halogen-plastics, but many efforts are needed for mutually beneficial outcomes. Overall, future investigations in the development of copyrolysis and catalyst-driven technologies for upcycling halogen-plastics are highlighted.

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Section: Recent Advancements In Thermochemical Treatmentsmentioning

confidence: 99%

Section: In Situ Catalytic Pyrolysismentioning

confidence: 99%

Recent Advancements in Pyrolysis of Halogen-Containing Plastics for Resource Recovery and Halogen Upcycling: A State-of-the-Art Review

Ma,

Kumagai,

Saito

et al. 2024

Environ. Sci. Technol.

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“…Although waste-printed circuit boards only account for about 3% of all produced e-waste, the complex toxic components used in WPCBs, which involve heavy metals and brominated flame retardants, make them hazardous waste that must be treated very cautiously [31][32][33]. Moreover, considering the fact that various valuable metals, polymers, glass fiber, and toxic components were simultaneously integrated in such small volumes, the recovery and recycling of WPCBs become particularly intractable.…”

Section: Recovery and Characterization Of Wpcb Non-metallic Componentsmentioning

confidence: 99%

High Value-Added Reutilization of Waste-Printed Circuit Boards Non-Metallic Components in Sustainable Polymer Composites

Hu,

Zeng,

Lin

et al. 2023

Molecules

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The reutilization non-metallic components from a waste-printed circuit board (WPCB) has become one of the most significant bottlenecks in the comprehensive reuse of electronic wastes due to its low value and complex compositions, and it has received great attention from scientific and industrial researchers. To effectively address the environmental pollution caused by inappropriate recycling methods, such as incineration and landfill, extensive efforts have been dedicated to achieving the high value-added reutilization of WPCB non-metals in sustainable polymer composites. In this review, recent progress in developing sustainable polymer composites based on WPCB non-metallic components was systematically summarized. It has been demonstrated that the WPCB non-metals can serve as a promising reinforcing and functional fillers to significantly ameliorate some of the physical and chemical properties of polymer composites, such as excellent mechanical properties, enhanced thermal stability, and flame retardancy. The recovery strategies and composition of WPCB non-metals were also briefly discussed. Finally, the future potentials and remaining challenges regarding the reutilization of WPCB non-metallic components are outlined. This work provides readers with a comprehensive understanding of the preparation, structure, and properties of the polymer composites based on WPCB non-metals, providing significant insights regarding the high value-added reutilization of WPCB non-metals of electronic wastes.

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“…In recent years, the mainstream of the recycling approaches of PCBs has focused on chemical process approaches [ 9 ], including co-pyrolysis [ 10 ], hydrometallurgy with nitric acid [ 11 ], and bio-metallurgical processes by biosorption and bioleaching [ 12 ]. These processes are very time-consuming, high energy-demanding, and may release significant pollutants into the atmosphere [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Gravity and Electrostatic Separation for Recovering Metals from Obsolete Printed Circuit Board

Oliveira

Tori²,

Zanetti

et al. 2022

Materials

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This study proposed an evaluation of enrichment processes of obsolete Printed Circuit Boards (PCBs), by means of gravity and electrostatic separation, aiming at the recovery of metals. PCBs are the most important component in electronic devices, having high concentrations of metals and offering a secondary source of raw materials. Its recycling promotes the reduction in the environmental impacts associated with its production, use, and disposal. The recovery method studied started with the dismantling of the PCB, followed by a comminution and granulometric classification. Subsequent magnetic, gravity, and electrostatic separations were performed. After the separations, a macroscopic visual evaluation and chemical analysis were carried out, determining the metal content in the concentrate products. The results obtained from gravity separation showed a product with metallic concentrations of 89% and 76% for particle sizes of 0.3–0.6 mm and 0.6–1.18 mm, respectively. In electrostatic separation, the product obtained was 88% for the lower particle size (<0.3 mm) and 62% for particles sizes >1.18 mm.

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Co-pyrolysis of waste printed circuit boards with iron compounds for Br-fixing and material recovery

Cited by 25 publications

References 36 publications

Recent Advancements in Pyrolysis of Halogen-Containing Plastics for Resource Recovery and Halogen Upcycling: A State-of-the-Art Review

Recent Advancements in Pyrolysis of Halogen-Containing Plastics for Resource Recovery and Halogen Upcycling: A State-of-the-Art Review

High Value-Added Reutilization of Waste-Printed Circuit Boards Non-Metallic Components in Sustainable Polymer Composites

Gravity and Electrostatic Separation for Recovering Metals from Obsolete Printed Circuit Board

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