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One PCB specimen from SCF CO2 treatment is picked up for demonstration. The specimen is a B1 board by SCF CO2 treatment at 4000 psi, 200 C for 6 hours with 7 mole % of water added as environmentally benign co-solvent to enhance the interactions between PCB resins and SCF CO2. Due to the equipment confinement, the recycling processes of the selected B1 board after SCF CO2 treatment is all manually performed. Although the result is a rough estimate of the PCB output after SCF CO2 treatment, it still can give us a clear indication of the advantages and potential of the supercritical fluid process in future PCB recycling processes. The selected B1 board is manually twisted to achieve a complete delaminating of its substrate. As described in section 5.2.1, the B1 substrate is comprised of 14 layers in which the 6th and 9th layer are copper layers, with all others classified as polymeric layers. The substrate is completely delaminated and two copper layers are removed out of the polymeric layers manually. The printed circuits and surface metals on both of the surface layers are manually removed and collected according to their general material classifications. Some printed circuits are also manually removed from several other polymer layers next to the surface layers and collected according to their general material classifications. In this way, the manual recycling results from B1 board after SCF CO2 treatment are classified into four groups namely polymers, coppers, mixture of surface metals and brominated flame retardant particles, and weight loss which is a very small fraction of materials lost during the material separation and collection process. The recycling process is manually performed and hence it is not possible to effectively separate the surface metals from its mixture with brominated flame retardant particles. The result is shown in table 9. Table 9 Recycling results from B1 board with SCF CO2 treatment at 4000 psi, 200 C for 6 hours with 7 mole % of water added Polymers Weight (g) 15.01 Weight percent 73.29 % Copper 3.58 17.48 % Mixture of surface metals & Brominated flame retardant 1.55 7.57 % Weight loss 0.34 1.66 % The collected polymers and coppers are almost in 100% purity and the high purity grade enables them to be directly reused in more applications, while the mixture of surface metals and brominated flame retardant still need other processes for separation and recovery. Conclusions After the systematic study of the pressure, temperature, time and co-solvent factors in SCF CO2 treatment of PCB specimen, some conclusions are made for this research. Following is the innovative contributions of this project for better understanding of the significance of the research. At last, some suggestions are made for future work. This project deals with the economic and environmental issues from the electronics recycling industry by conducting research on an alternative process for PCB recycling. The proposed process is using supercritical fluid to treat the PCB scraps and then to delaminate the board for polymer and copper recycling. The surface cracking formed in the PCB treatment could automatically remove the large quantities of surface metals. 29PDF Image | Recycling Printed Circuit Board Wastes Through Supercritical Fluid Delaminating
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