Kim, Jang Won Lee, Albert S. Yu, Seunggun Han, Jeong Whan 2024-01-19T23:33:38Z 2024-01-19T23:33:38Z 2022-01-25 2018-01 0304-3894 https://pubs.kist.re.kr/handle/201004/121832 This paper reports the recycling of flexible printed circuit board (FPCB) waste through carbonization of polyimide by dual pyrolysis processes. The organic matter was recovered as pyrolyzed oil at low temperatures, while valuable metals and polyimide-derived carbon were effectively recovered through secondary high temperature pyrolysis. The major component of organics extracted from FPCB waste comprised of epoxy resins were identified as pyrolysis oils containing bisphenol-A. The valuable metals (Cu, Ni, Ag, Sn, Au, Pd) in waste FPCB were recovered as granular shape and quantitatively analyzed via ICP-OES. In attempt to produce carbonaceous material with increased degree of graphitization at low heat-treatment conditions, the catalytic effect of transition metals within FPCB waste was investigated for the efficient carbonization of polyimide films. The morphology of the carbon powder was observed by scanning electron microscopy and graphitic carbonization was investigated with X-ray analysis. The protocols outlined in this study may allow for propitious opportunities to salvage both organic and inorganic materials from FPCB waste products for a sustainable future. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV En masse pyrolysis of flexible printed circuit board wastes quantitatively yielding environmental resources Article 10.1016/j.jhazmat.2017.08.010 1 JOURNAL OF HAZARDOUS MATERIALS, v.342, pp.51 - 57 JOURNAL OF HAZARDOUS MATERIALS 342 51 57 N scie scopus 000414880800006 2-s2.0-85027530116 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article CATALYTIC GRAPHITIZATION AMORPHOUS-CARBON METALS NICKEL CHINA PD Flexible printed circuit board Recycling Pyrolysis Precious metals: carbon