利用298/77 K循环工艺回收PCB中铜组分

Recycling of Non-Metallic Components in PCB Based on 298/77 K Cycle Treatment

摘要: 面对日益复杂的废弃印制电路板(PCB)污染严重及金属组分难回收的实际问题，引入298/77 K循环处理工艺，首先分析温度改变对PCB内部结构所造成的影响和PCB自身力学性能变化，进而通过比对静电分选和离心分选后的实际回收率，验证了298/77 K循环处理工艺的可行性。在此基础上，进一步引入磁选方式，测试了经298/77 K循环处理后，PCB的铜组分实际回收率，并测定回收后铜组分的实际纯度。结果表明，298/77 K循环处理工艺对PCB内部结构造成了重要影响；并使PCB的各项力学性能均实现明显下降；PCB金属组分实际产出量和铜组分回收率，相比于传统处理方式实现了明显提升；且回收纯度满足市场对于单质铜的要求。

Abstract: Facing the increasingly complex practical problems of serious pollution of waste printed circuit board (PCB) and difficult recovery of metal components, 298/77 K recycling treatment process is introduced. First, the influence of temperature change on the internal structure of PCB and the change of mechanical properties of PCB itself are analyzed. Then, the feasibility of 298/77 K recy-cling treatment process is verified by comparing the actual recovery after static and centrifugal separation. On this basis, magnetic separation method was further introduced to test the actual recovery of copper components from PCB after 298/77 K cycle treatment and to determine the actual purity of copper components after recovery. The results show that 298/77 K cyclic treatment process has an important impact on the internal structure of PCB. The mechanical properties of PCB were significantly reduced. The actual output of PCB metal components and the recovery of copper components have been significantly improved compared with traditional treatment methods. And the purity of recovery meets the market demand for copper.