title: Metals recovering from waste printed circuit boards (WPCBs) using molten salts.
abstract: Recycling of waste electrical and electronic equipments (WEEE) has been taken into consideration in the literature due to the large quantity of concerned wastes and their hazardous contents. The situation is so critical that EU published European Directives imposing collection and recycling with a minimum of material recovery [1]. Moreover, WEEEs contain precious metals, making the recycling of these wastes economically interesting, but also some critical metals and their recycling leads to resource conservation. This paper reports on a new approach for recycling waste printed circuit boards (WPCBs). Molten salts and specifically molten KOH-NaOH eutectic is used to dissolve glasses, oxides and to destruct plastics present in wastes without oxidizing the most valuable metals. This method is efficient for recovering a copper-rich metallic fraction, which is, moreover, cleared of plastics and glasses. In addition, analyses of gaseous emission show that this method is environmentally friendly since most of the process gases, such as carbon monoxide and dioxide and halogens, are trapped in the highly basic molten salt. In other respects, under operation without oxygen, a large quantity of hydrogen is produced and might be used as fuel gas or as synthesis gas, leading to a favourable energy balance for this new process.
authors.affiliation: LEPMI, UMR 5279, CNRS - Grenoble INP-Université de Savoie, Université Joseph Fourier, BP75, 38402 Saint Martin d'Hères, France.
authors.forename: L
authors.initials: L
authors.lastname: Flandinet
authors.forename: F
authors.initials: F
authors.lastname: Tedjar
authors.forename: V
authors.initials: V
authors.lastname: Ghetta
authors.forename: J
authors.initials: J
authors.lastname: Fouletier
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D003247:Conservation of Natural Resources / Q000379:methods; D059029:Electronic Waste / Q000032:analysis*; D005062:European Union; D008401:Gas Chromatography-Mass Spectrometry; D006219:Halogens / Q000032:analysis; D006878:Hydroxides / Q000737:chemistry; D007202:Indicators and Reagents; D008670:Metals / Q000302:isolation & purification*; D008838:Microcomputers; D008855:Microscopy, Electron, Scanning; D009930:Organic Chemicals / Q000032:analysis; D010084:Oxidation-Reduction; D017680:Potassium Compounds / Q000737:chemistry; D059027:Recycling / Q000379:methods; D012492:Salts / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D006219:Halogens; D006878:Hydroxides; D007202:Indicators and Reagents; D008670:Metals; D009930:Organic Chemicals; D017680:Potassium Compounds; D012492:Salts; D002245:Carbon Dioxide; D012972:Sodium Hydroxide; D002248:Carbon Monoxide; C029943:potassium hydroxide