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Separation of Non-Metallic Components in Waste Printed Circuit Boards (WPCBs) using Organic Solvent and Potassium Phosphate Solution  

Lee, Jae-Cheon (Mineral Resource Divisionn, Korea Institute of Geoscience and Mineral Resources)
Jeong, Jin Ki (Mineral Resource Divisionn, Korea Institute of Geoscience and Mineral Resources)
Kim, Jong Seok (School of Chemical Engineering, Chonbuk National University)
Publication Information
Applied Chemistry for Engineering / v.23, no.4, 2012 , pp. 367-371 More about this Journal
Abstract
Waste printed circuit boards (WPCBs) contain valuable metals such as Cu, Ni, Au, Ag, and Pd. For an effective recycling of WPCBs, it is essential to recover the valuable metals. In recent years, recycling processes have come to be necessary for separating noble metals from WPCBs due to an increasing amount of electronic device wastes. However, it is well known that glass reinforced epoxy resins in the WPCBs are difficult materials to separate into elemental components, namely metals, glass fibers and epoxy resins in the chemical recycling process. $K_3PO_4$ as a catalyst in dimethylformamide (DMF) and N-Methyl-2-pyrrolidone (NMP) was used to depolymerize epoxy resins for recovering metallic and non-metallic components from WPCBs. Reactions of WPCBs were carried out at temperatures $160{\sim}200^{\circ}C$ for 2~12 h. The recycled glass fiber from WPCBs was analyzed by thermogravimetric analyzer (TGA) and evaluated the degree of solubility of the epoxy resin for separation efficiencies of the WPCBs.
Keywords
WPCBs; recycling; valuable metals; chemical recycling;
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