Research on the pyrolysis kinetics of resin powder on waste printed circuit board with different particle sizes at different heating rates: inspiration for the pyrolysis mechanism

Autor: Dun Wu, Longjin Jiang, Guizhen Ding, Wenfei Chi
Rok vydání: 2021
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 147:8047-8059
ISSN: 1588-2926
1388-6150
DOI: 10.1007/s10973-021-11102-9
Popis: Pyrolysis technology plays an increasingly important role in treating waste circuit boards, recycling metals in circuit boards, and recycling non-metallic components such as resins and glass fibers. However, the pyrolysis mechanism of printed circuit board (PCB) without any electronic components and with a small amount of copper foil is not comprehensive at present. The pyrolysis characteristics and pyrolysis mechanism were studied under different particle size conditions and different heating rates. The study found that the pyrolysis of waste printed circuit board (PCB) resin powder can be divided into four stages: evaporation of residual water on the surface or dissipation of other small molecules, oxidation of side chain groups of epoxy resin, decomposition of tetrabromobisphenol A and decomposition of pyrolysis residues. Kissinger, Flynn–Wall–Ozawa (FWO), Tang and other methods were used to solve the kinetic parameters of thermal decomposition reaction of samples, and it was found that the activation energy and pre-exponential factor of large particles (0.5–0.9 mm) are lower than those of small particles (
Databáze: OpenAIRE
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