title: Separation and recovery of glass, plastic and indium from spent LCD panels.
abstract: The present paper deals with physico-mechanical pre-treatments for dismantling of spent liquid crystal displays (LCDs) and further recovery of valuable fractions like plastic, glass and indium. After a wide experimental campaign, two processes were designed, tested and optimized. In the wet process, 20%, 15% and 40% by weight of the feeding panels are recovered as plastic, glass and indium concentrate, respectively. Instead, in the dry process, only two fractions were separated: around 11% and 85% by weight are recovered as plastic and glass/indium mixture. Indium, that concentrated in the -212μm fraction, was completely dissolved by sulphuric acid leaching (0.75molL-1H2SO4solution, 80°C, 10%vol H2O2, pulp density 10%wt/vol, leaching time 3h). 100% of indium can be extracted from the pregnant solution with 5%wt/vol Amberlite™ resin, at room temperature and pH 3 in 24h. Indium was thus re-extracted from the resin by means of a 2molL-1H2SO4solution, at room temperature and S/L of 40%wt/vol.
authors.affiliation: Department of Industrial Engineering, Information and Economics, University of L'Aquila, Via G. Gronchi 18, 67100 L'Aquila, Italy. Electronic address: francesco.ferella@univaq.it.
authors.forename: Francesco
authors.initials: F
authors.lastname: Ferella
authors.affiliation: Institute of Environmental Geology and Geo-Engineering (IGAG-CNR), Via Salaria km 29,300, 00015 Monterotondo, Roma, Italy.
authors.forename: Girolamo
authors.initials: G
authors.lastname: Belardi
authors.affiliation: Department of Industrial Engineering, Information and Economics, University of L'Aquila, Via G. Gronchi 18, 67100 L'Aquila, Italy.
authors.forename: Antonella
authors.initials: A
authors.lastname: Marsilii
authors.affiliation: Department of Industrial Engineering, Information and Economics, University of L'Aquila, Via G. Gronchi 18, 67100 L'Aquila, Italy.
authors.forename: Ida
authors.initials: I
authors.lastname: De Michelis
authors.affiliation: Department of Industrial Engineering, Information and Economics, University of L'Aquila, Via G. Gronchi 18, 67100 L'Aquila, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Vegliò
mesh_terms: D059029:Electronic Waste / Q000032:analysis; D005898:Glass; D007204:Indium / Q000302:isolation & purification*; D050866:Liquid Crystals / Q000737:chemistry*; D010969:Plastics; D059027:Recycling / Q000379:methods; D012037:Refuse Disposal / Q000379:methods*
chemical_list: D010969:Plastics; D007204:Indium
keywords: ITO; Indium; LCD; Recycling; WEEE