Characterization of solid, liquid and gaseous products from waste printed circuit board pyrolysis

Chen, Weifang; Chen, Yan-Jun; Shu, Yongkai; He, Yan; Wei, Jinbo

doi:10.1016/j.jclepro.2021.127881

Cited by 34 publications

(7 citation statements)

References 41 publications

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“…In addition, the absorption band at 1152 cm −1 represents C−O−C, and the absorption band at 735 cm −1 represents epoxy group [37] . The absorption band at 476 cm −1 may be due to the stretching vibration of C−Br [38] . However, compared with raw materials, conventional pyrolysis and conventional steam atmosphere pyrolysis, the stretching vibration of C−Br in microwave steam atmosphere pyrolysis is almost absent.…”

Section: Resultsmentioning

confidence: 99%

“…Chen et al . pyrolyzed waste printed circuit boards at 450 °C–800 °C [38] . By analyzing the pyrolysis oil, it was found that the main components of the pyrolysis oil, phenol and alkylated phenol, changed with temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Chen et al pyrolyzed waste printed circuit boards at 450 °C-800 °C. [38] By analyzing the pyrolysis oil, it was found that the main components of the pyrolysis oil, phenol and alkylated phenol, changed with temperature. The experimental study of Hall et al showed that the initial components of pyrolysis oil were bisphenol A and 4-propyl-2-benzyl alcohol, [16] which were then decomposed into various phenolic products.…”

Section: Pyrolytic Oil Analysismentioning

confidence: 99%

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Bromine Migration and Product Analysis of Waste Printed Circuit Boards during Microwave Steam‐Gasification‐Assisted Pyrolysis

Li,

Liu,

Xia

et al. 2023

ChemistrySelect

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Bromine in waste printed circuit boards has caused serious harm to the environment. How to deal with it safely is a problem. In this paper, the debromination of waste printed circuit boards by microwave gasification pyrolysis was studied, and the properties of pyrolysis products and the migration of bromine were analyzed. The optimum pyrolysis conditions of microwave steam atmosphere were 600 °C, 1000 W, 50 min, 2 mL/min. Compared with conventional pyrolysis and conventional steam pyrolysis, less solid products (60.39 wt %) were obtained, and more metal copper was enriched. The content increased from 27.46 % and 28.35 % to 30.63 %, respectively, and the diffraction peak intensity of copper was also enhanced. There is no obvious change in the type of functional groups of the solid product, and its microscopic morphology is smoother. Compared with conventional pyrolysis, the phenolic compounds in pyrolysis oil decreased, and increased compared with conventional steam pyrolysis. The content of H2 in the pyrolysis gas increased significantly, and the content of CO decreased significantly. Compared with conventional pyrolysis, the bromine content in pyrolysis gas and pyrolysis oil decreased from 94.5 % and 5.5 % to 1 %, respectively, and more bromine (98 %) in the raw material entered the aqueous solution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Pyrolytic Oil Analysismentioning

confidence: 99%

See 1 more Smart Citation

Bromine Migration and Product Analysis of Waste Printed Circuit Boards during Microwave Steam‐Gasification‐Assisted Pyrolysis

Li,

Liu,

Xia

et al. 2023

ChemistrySelect

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“…5,6 The abundance of these valuable elements is much higher than the natural abundance, 7 so it is important to promote the resource utilization of these "secondary resources" for environmental capacity and sustainable economic development. 8,9 At present, the common WPCB resource treatment methods include mechanical method, 10,11 chemical method, 12,13 incineration method, 14,15 pyrolysis method, 16,17 biological method, 18,19 and so forth. Regardless of the method, efficient extraction of metals is the key to resourceful treatment of WPCB.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the common WPCB resource treatment methods include mechanical method, , chemical method, , incineration method, , pyrolysis method, , biological method, , and so forth. Regardless of the method, efficient extraction of metals is the key to resourceful treatment of WPCB.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microwave Pretreatment on the Leaching and Enrichment Effect of Copper in Waste Printed Circuit Boards

Huang

et al. 2023

ACS Omega

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The use of efficient and clean methods for the recycling of waste circuit boards is an ongoing challenge. In this research, the effect of microwave pretreatment on the leaching and enrichment of copper from waste print circuit board (WPCB) was studied. The morphology and chemical structure of WPCB particles before and after microwave pretreatment were analyzed by SEM/EDS and Fourier infrared spectroscopy. Leaching experiments and copper enrichment tests were designed to investigate the effect of different microwave irradiation powers and microwave irradiation times on the copper leaching rate and copper enrichment rate in WPCB. The leaching experiment results showed that microwave pretreatment can effectively improve the leaching rate of WPCB. When the microwave irradiation power was 700 W, the irradiation time was 120 s, and the leaching time was 15 min, the copper leaching rate in WPCB was 57.01%, which was 24.34% higher than that in the untreated condition. The results of copper enrichment experiment show that microwave pretreatment can effectively improve the copper enrichment of WPCB. After microwave pretreatment, copper was effectively enriched in the 4–2 and 2–1 mm particle sizes. When the microwave irradiation time was 120 s, the copper enrichment rates in the 4–2 and 2–1 mm particle sizes were 1.74 and 1.66, which increased by 0.63 and 0.32, respectively, compared to the untreated condition. Microwave pretreatment enables the effective separation of metallic copper from non-metallic components in WPCB, increasing the exposure area of copper and promoting the monomer separation of copper, thus improving the leaching and enrichment of copper.

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Preliminary strategy and product analysis of microwave pyrolysis of waste printed circuit board

Liu,

Li,

Shu

et al. 2024

Can J Chem Eng

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In this study, microwave pyrolysis of waste printed circuit boards (WPCBs) was carried out in an inert atmosphere, and the effects of pyrolysis temperature and nitrogen flow rate on the yield and composition of pyrolysis products were investigated. With the increase of pyrolysis temperature, the yield of liquid product increases gradually, and the yield of solid product decreases gradually. At 600°C, the yield of each phase tends to be stable. When the temperature continues to rise, the content of H2 and CO decreases, and the content of C6 ~ C9 in the liquid product decreases. Microwave heating promotes the pyrolysis of brominated epoxy resin, which helps to improve the recovery rate of valuable substances and reduce the environmental impact of waste treatment. This study demonstrates that the microwave pyrolysis of WPCBs in nitrogen atmosphere has great potential in the green recovery process.

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Characterization of solid, liquid and gaseous products from waste printed circuit board pyrolysis

Cited by 34 publications

References 41 publications

Bromine Migration and Product Analysis of Waste Printed Circuit Boards during Microwave Steam‐Gasification‐Assisted Pyrolysis

Bromine Migration and Product Analysis of Waste Printed Circuit Boards during Microwave Steam‐Gasification‐Assisted Pyrolysis

Effect of Microwave Pretreatment on the Leaching and Enrichment Effect of Copper in Waste Printed Circuit Boards

Preliminary strategy and product analysis of microwave pyrolysis of waste printed circuit board

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