The effect of microwave pyrolysis on product characteristics and bromine migration for a non-metallic printed circuit board

Kuo Hsiung Lin, Jiun Horng Tsai, Chen Laun Lan, Hung Lung Chiang

研究成果: Article同行評審

14 引文 斯高帕斯(Scopus)

摘要

At present, it is necessary to carry out environmentally friendly treatment of non-metallic fractions (NMFs) of waste printed circuit board (WPCB) to improve resource utilization. NMFs of WPCB are pyrolyzed by microwave heating to determine the effect of different operating conditions on the characteristics of pyrolysis products. The results show that yields for residue, oil and gas are 59.03–67.63, 7.10–28.46 and 4.86–33.88 wt%. A high temperature promotes a decrease in oil yield and an increase in non-condensable gas yield. An increase in the NaOH dose results in a more significant cracking of the oil to gas. Increasing the concentration of NaOH increases the mass fraction of the total Br in residues (from 23.62 to 86.94 %), so the addition of NaOH is beneficial to the fixation of Br. A kinetics study shows that there are two thermal decomposition regions (398–625 K and 675–925 K), and NaOH-catalyzed pyrolysis reduces the activation energy to 18.91 and 31.95 kJ mol−1, respectively. The formation of Br-containing substances in the pyrolysis oil and gas can be inhibited if the bromine fixation in pyrolysis residue increases. NaOH-catalyzed pyrolysis can reduce bromine and also reduce energy recovery efficiency. This pyrolysis process still requires further research to improve the recovery of energy and valuable materials.

原文English
頁(從 - 到)147-155
頁數9
期刊Waste Management
153
DOIs
出版狀態Published - 2022 11月

All Science Journal Classification (ASJC) codes

  • 廢物管理和處置

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