A REVIEW ON WASTE PRINTED CIRCUIT BOARD RECYCLING TECHNIQUES. SHYLIN H. JOSE, S. PAVENDHIRAN AND R.A. SANKARAN
The recycling of waste printed circuit boards (WPCBs) is an important subject not only from the point of view of environmental protection but also with respect to the recovery of valuable materials. The WPCBs receives wide concerns as the amounts of scrap printed circuit boards (PCBs) increases dramatically. However treatment for WPCBs is challenge due to the fact that PCBs are diverse and complex in terms of materials and components makeup as well as the original equipments manufacturing processes. Therefore it is urgent to develop a proper recycle technology for WPCBs. Many recycling technologies were reviewed in this paper. The WPCBs recycling process usually includes pretreatment, mechanical separation, Pyrometallurgy and chemical recycling. WPCBs recycling generally starts from the pretreatment stage, which include disassembly of the reusable and toxic parts. After pretreatment process, PCBs are treated using mechanical separation or Pyrometallurgy process. Mechanical separation involves a preliminary step were size reduction of the waste is formed followed by a step in which metallic and nonmetallic are separated and collected for further management. In the end, materials are finally recovered after chemical recycling process. The Pyrometallurgical process used to remove plastic and other organic materials with the aim of concentrating metals. In this review, metals fraction can be treated by Pyrometallurgy, Mechanical separation and Hydrometallurgy process.
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