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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

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Abstract

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 (< 0.5 mm). In addition, the experimental curve determined by z(α) master plots method mainly accords with Mampel power model (P3): \(G\left( \alpha \right) = \alpha^{\frac{1}{2}}\), and random nucleation and subsequent growth model (Avrami-Erofeev A2): \(G\left( \alpha \right) = \left[ { - \ln \left( {1 - \alpha } \right)} \right]^{\frac{1}{2}}\) in the main pyrolysis interval.

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Acknowledgements

We acknowledge supports from the Anhui Province Major Scientific and Technological Research Projects (201903a07020019) and the Anhui Province "115" Innovation Industry Team (13th batch).

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Authors and Affiliations

  1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China

    Dun Wu

  2. Anhui Provincial Bureau of Coal Geology, Exploration Research Institute, Hefei, 230088, China

    Dun Wu & Wenfei Chi

  3. School of Resources and Environmental Engineering, Anhui University, Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, 230601, Anhui, China

    Guizhen Ding

  4. Anhui ChaoYue Environmental Protection Technology Co., Ltd, Chuzhou, 239000, China

    Longjin Jiang

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  1. Dun Wu
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  2. Guizhen Ding
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Correspondence to Dun Wu or Wenfei Chi.

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Wu, D., Ding, G., Chi, W. et al. 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. J Therm Anal Calorim 147, 8047–8059 (2022). https://doi.org/10.1007/s10973-021-11102-9

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