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Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

Author

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  • Jing Sun

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

  • Wenlong Wang

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

  • Zhen Liu

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

  • Qingluan Ma

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

  • Chao Zhao

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

  • Chunyuan Ma

    (National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China)

Abstract

This paper describes a kinetic study of the decomposition of waste printed circuit boards (WPCB) under conventional and microwave-induced pyrolysis conditions. We discuss the heating rates and the influence of the pyrolysis on the thermal decomposition kinetics of WPCB. We find that the thermal degradation of WPCB in a controlled conventional thermogravimetric analyzer (TGA) occurred in the temperature range of 300 °C–600 °C, where the main pyrolysis of organic matter takes place along with an expulsion of volumetric volatiles. The corresponding activation energy is decreased from 267 kJ/mol to 168 kJ/mol with increased heating rates from 20 °C/min to 50 °C/min. Similarly, the process of microwave-induced pyrolysis of WPCB material manifests in only one stage, judging by experiments with a microwave power of 700 W. Here, the activation energy is determined to be only 49 kJ/mol, much lower than that found in a conventional TGA subject to a similar heating rate. The low activation energy found in microwave-induced pyrolysis suggests that the adoption of microwave technology for the disposal of WPCB material and even for waste electronic and electrical equipment (WEEE) could be an attractive option.

Suggested Citation

  • Jing Sun & Wenlong Wang & Zhen Liu & Qingluan Ma & Chao Zhao & Chunyuan Ma, 2012. "Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating," Energies, MDPI, vol. 5(9), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:9:p:3295-3306:d:19802
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    References listed on IDEAS

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    1. Lam, Su Shiung & Russell, Alan D. & Chase, Howard A., 2010. "Microwave pyrolysis, a novel process for recycling waste automotive engine oil," Energy, Elsevier, vol. 35(7), pages 2985-2991.
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    2. José Juan Alvarado Flores & José Guadalupe Rutiaga Quiñones & María Liliana Ávalos Rodríguez & Jorge Víctor Alcaraz Vera & Jaime Espino Valencia & Santiago José Guevara Martínez & Francisco Márquez Mo, 2020. "Thermal Degradation Kinetics and FT-IR Analysis on the Pyrolysis of Pinus pseudostrobus , Pinus leiophylla and Pinus montezumae as Forest Waste in Western Mexico," Energies, MDPI, vol. 13(4), pages 1-25, February.
    3. Zhou, Yuli & Wang, Wenlong & Sun, Jing & Fu, Lunjing & Song, Zhanlong & Zhao, Xiqiang & Mao, Yanpeng, 2017. "Microwave-induced electrical discharge of metal strips for the degradation of biomass tar," Energy, Elsevier, vol. 126(C), pages 42-52.
    4. Sun, Jing & Wang, Wenlong & Yue, Qinyan & Ma, Chunyuan & Zhang, Junsong & Zhao, Xiqiang & Song, Zhanlong, 2016. "Review on microwave–metal discharges and their applications in energy and industrial processes," Applied Energy, Elsevier, vol. 175(C), pages 141-157.
    5. Song, Zhanlong & Liu, Li & Yang, Yaqing & Sun, Jing & Zhao, Xiqiang & Wang, Wenlong & Mao, Yanpeng & Yuan, Xueliang & Wang, Qingsong, 2018. "Characteristics of limonene formation during microwave pyrolysis of scrap tires and quantitative analysis," Energy, Elsevier, vol. 142(C), pages 953-961.
    6. El Khaled, D. & Novas, N. & Gazquez, J.A. & Manzano-Agugliaro, F., 2018. "Microwave dielectric heating: Applications on metals processing," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2880-2892.
    7. Li, Longzhi & Tan, Yongdong & Sun, Jifu & Zhang, Yue & Zhang, Lianjie & Deng, Yue & Cai, Dongqiang & Song, Zhanlong & Zou, Guifu & Bai, Yonghui, 2021. "Characteristics and kinetic analysis of pyrolysis of forestry waste promoted by microwave-metal interaction," Energy, Elsevier, vol. 232(C).
    8. Song, Zhanlong & Yang, Yaqing & Sun, Jing & Zhao, Xiqiang & Wang, Wenlong & Mao, Yanpeng & Ma, Chunyuan, 2017. "Effect of power level on the microwave pyrolysis of tire powder," Energy, Elsevier, vol. 127(C), pages 571-580.
    9. Soyoung Han & Yong-Chul Jang & Yeon-Seok Choi & Sang-Kyu Choi, 2020. "Thermogravimetric Kinetic Study of Automobile Shredder Residue (ASR) Pyrolysis," Energies, MDPI, vol. 13(6), pages 1-16, March.

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