Microwave-assisted chemical recovery of glass fiber and epoxy resin from non-metallic components in waste printed circuit boards

2021 ◽  
Vol 124 ◽  
pp. 8-16
Author(s):  
Kaiyou Huang ◽  
Jiongli Zheng ◽  
Wenyi Yuan ◽  
Xiaoyan Wang ◽  
Qingbin Song ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Epoxy Resin ◽  
Printed Circuit Boards ◽  
Chemical Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Microwave Assisted ◽  
Waste Printed Circuit Boards

Recycling Of the Epoxy Resin of the Waste Printed Circuit Boards Using Solvent Extraction

2011 ◽  
Vol 383-390 ◽  
pp. 3140-3144 ◽  
Author(s):  
Lin Zhuan Ma ◽  
Hua Wang ◽  
Shan Qing ◽  
Lin Zhuan Ma
Keyword(s):  
Solvent Extraction ◽  
Epoxy Resin ◽  
Flame Retardants ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
The Public ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Land Filling

Currently, the number of the waste printed circuit boards (WPCB) is increasing. The technologies of extracting and reclaiming of the value of the metallic fraction of WPCB have been used widely because of the major economic driving force. But the non-metallic fractions (NMFs), which take up almost 70wt% of waste WPCB, were mainly treated by combustion or land filling in the past. However, combustion of the NMFs will cause the formation of highly toxic polybrominated dibenzodioxins and dibenxofurans (PBDD/Fs). Land filling of the NMFs will lead to secondly pollution that caused by heavy meatals and brominated flame retardants (BFRs) leaching to the groundwater. Therefore, recycling of the NMFs from waste PCBs is drawing more and more attention from the public and the governments. How to recycle the NMFs environmental soundly has become a significant topic in recycling of WPCB. This paper briefly introduced that the damage of WPCB and the recycling methods of epoxy resin. The method was established for recycling of WPCB by using solvent extraction. And the optimal conditions were attained through experiments: the reaction temperature was 80°C、the reaction time was 3h、the concentration of nitrate acid was 8 mol/l, the amount of nitrate acid : the quality of WPCB was 50ml/10g.

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