title: Mineralogical analysis of dust collected from typical recycling line of waste printed circuit boards.
abstract: As dust is one of the byproducts originating in the mechanical recycling process of waste printed circuit boards such as crushing and separating, from the viewpoints of resource reuse and environmental protection, an effective recycling method to recover valuable materials from this kind of dust is in urgent need. In this paper, detailed mineralogical analysis on the dust collected from a typical recycling line of waste printed circuit boards is investigated by coupling several analytical techniques. The results demonstrate that there are 73.1wt.% organic matters, 4.65wt.% Al, 4.55wt.% Fe, 2.67wt.% Cu and 1.06wt.% Pb in the dust, which reveals the dust is worthy of reuse and harmful to environment. The concentration ratios of Fe, Mn and Zn can reach 12.35, 12.33 and 6.67 respectively by magnetic separation. The yield of dust in each size fraction is nonuniform, while the yield of -0.75mm size fraction is up to 51.15wt.%; as the particle size decreases, the content of liberated metals and magnetic materials increase, and metals are mainly in elemental forms. The F, Cl and Br elements combing to C in the dust would make thermal treatment dangerous to the environment. Based on these results, a flowsheet to recycle the dust is proposed.
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China. Electronic address: ymzhao_paper@126.com.
authors.forename: Yuemin
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Chenlong
authors.initials: C
authors.lastname: Duan
authors.affiliation: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Lizhang
authors.initials: L
authors.lastname: Wang
mesh_terms: D004391:Dust / Q000032:analysis*; D059029:Electronic Waste / Q000032:analysis; D055595:Mechanical Phenomena; D008670:Metals / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000032:analysis*; D010316:Particle Size; D059027:Recycling / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D004391:Dust; D008670:Metals; D008903:Minerals
keywords: Dust; Mechanical separation; Mineralogical analysis; Recycling; Waste printed circuit boards