Research on reusing technology for disassembling waste printed circuit boards

摘要

Waste printed circuit boards (WPCBs), which have lots of highly valuable components and toxic substances, are important subjects for disposal of waste electric and electronic equipment (WEEE). Nowadays material recycling and components reusing are still the main disposal methods of WPCBs. Increased crushing-sorting separation technology to extract valuable metals from WPCBs usually produce large amounts of resin powder which result in seriously secondary pollution. The study aims to the disassembly acceleration and separation of components without damage on WPCBs. The components reuse-oriented disassembly technology is studied, in which the key technologies of leaching and sealing-off. Fluoboric acid/ Hydrogen peroxide leaching system is discussed in detailed including solution concentration, reaction time and metal leaching rate. The experiments realize the dismantling of WPCBs by selectively dissolve solder and offer a new way to recycle valuable materials from WPCBs and prevent the environmental pollution effectively.