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Materials recovery from waste liquid crystal displays: A focus on indium

TitoloMaterials recovery from waste liquid crystal displays: A focus on indium
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2015
AutoriFontana, Danilo, Forte Federica, De Carolis R., and Grosso M.
RivistaWaste Management
Volume45
Paginazione325-333
ISSN0956053X
Parole chiave1, 10-phenanthroline, ABSs, acetic acid ethyl ester, Acetone, Aqueous biphasic system, aqueous phase, article, Chemical treatments, controlled study, crystal, electronic waste, Extraction, Hydrometallurgy, Indium, Indium concentration, Initial concentration, leaching, limonene, Liquid, liquid crystal display waste, Liquid crystal displays, Liquid nitrogen, macrogol, Materials recovery, Metal recovery, Metallurgy, partitioning, physical phase, pollutant removal, precipitation, priority journal, Recovery, Room temperature, Salt concentration, solubilization, Solvent extraction, Waste treatment
Abstract

In the present work the recovery of indium and of the polarizing film from waste liquid crystal displays was experimentally investigated in the laboratory. First of all, the polarizing film was removed by employing a number of different techniques, including thermal and chemical treatments. Leaching of indium was then performed with HCl 6. N, which allowed solubilisation of approximately 90% In (i.e. 260. mg In per kg of glass) at room temperature, without shredding. Indium recovery from the aqueous phase was then investigated through solvent extraction with polyethylene glycol (PEG)-based aqueous biphasic systems. Indium extraction tests through the PEG-ammonium sulphate-water system were conducted as a function of PEG concentration, salt concentration and molecular weight of PEG, using 1,10 phenanthroline as a ligand. The experimental results demonstrated that indium partitioning between the bottom (salt-rich) and the top (PEG-rich) phase is quite independent on the composition of the system, since 80-95% indium is extracted in the bottom phase and 5-20% in the top phase; it was also found that when PEG concentration is increased, the ratio between the bottom and the upper phase volumes decreases, resulting in an increase of indium concentration in the bottom phase (at [PEG]. =. 25% w/w, indium concentration in the bottom phase is 30% higher than the initial concentration before the extraction). © 2015 Elsevier Ltd.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84955210326&doi=10.1016%2fj.wasman.2015.07.043&partnerID=40&md5=94575a68bf7a150d6bca38492872c4e5
DOI10.1016/j.wasman.2015.07.043
Citation KeyFontana2015