Research On Experiment And Mechanism Of Discarded PCB Reutilization Based On Supercritical Fluid Technology

The recycling treatment and reusing of abandoned electronic appliances can not only save limited resource and energy, but also efficiently protect the environment, and it is an important part in realizing the recycling economy and sustainable development strategy. Printed circuit board scraps (PCBs) are one kind of abandoned electronic appliance, which has great quantity, wide usage spectrum, high value, and may cause serious environmental pollution. Therefore, the PCBs' recycling technique and method attracts the attention from many research institutions at home and abroad.Based on the review of current research on the PCBs' recycling technique and method, this paper applies the new environmentally friendly technology-supercritical fluid to the recycling of abandoned PCBs, and do deep research on the development of experimental system, research design and recycling mechanism. Firstly, this paper gets a review of current research on the PCBs' recycling technique and method, their applying situations and their advantages and disadvantages. Then, it does research on basic methodology and applying situation of supercritical fluid technology. It develops intermittent supercritical CO2 fluid recycling experimental system with high temperature and high pressure, provides experimental platform, and use orthogonal experiment design method to design the experiment. Based on the gathering and analyzing of experimental data, it use SPSS to analyze the influence of temperature, pressure, response time and solvent on the PCBs' delamination, the interaction of these factors, the significance analyzing of these factors, and get the best experiment parameter after synthesizing all the factors. After systematically analyzing the structure and physical and chemical characteristics of the components of PCBs, it do deep research on the recycling mechanism. By testing the mass spectrum of sample, this paper anylizes the decompounding resultant and process of the resign material during the recycling and by establishing solubility model, it reseraches on the solubility of the resign material. At last, it compares the recycling method using supercritcial CO₂ with other methods, and gets its characteristics.