| 摘要(英) |
In recent years, countries around the world have paid more and more attention to issues such as carbon emissions, carbon taxes, and carbon reduction technologies. The European Union adopted the "European Plastics Strategy for the Circular Economy Model" and the Circular Economy Policy. The raw material recovery rate of waste electronic products needs to reach 70% in 2030. The purpose is to improve the design, manufacture, use and recycling of plastic products in the past. In order to solve the electronic waste generated by the industry and comply with the ESG policy trend, this research will develop an environmentally friendly, chemical-free waste liquid and excellent separation process for the recycling of waste PCB molded board dust. We have successfully processed kilogram-level PCB molded board dust by liquid swirl gravity separation. The copper content of the recovered upper layer of non-copper dust can be reduced to less than 2 wt%, and the lower layer of metal copper content can be increased to more than 50 wt%. In the follow-up, in order to improve the convenience of retrieving materials and the needs of closed systems, we will further develop a funnel-type liquid-vortex sorting process. After the improved process is sorted, the copper content of the recovered upper layer of non-copper dust can still be reduced to below 2 wt%. The copper content of the lower layer metal can be increased to 75 wt%.
In addition, this sorting process technology is not only suitable for the dust recovery of 38 um size, but also has the opportunity to achieve the reuse of sorting liquid distillation, and there is no discharge of chemical waste liquid such as strong acid and alkali during the sorting process, which is environmentally friendly. After sorting, the metal dust can be used in the fields of building materials, decoration materials, industrial plastic boards, PCB board raw materials, adhesives, etc. by means of blending and chemical degradation, so as to achieve the effect of giving circular value and realize carbon reduction. ESG indicators such as waste recycling and environmental friendliness. |
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