engleski

Possibility of recycling of waste LCD residues in concrete industry

Over the last years, technological advancement in electric and electronic equipment have boosted economic growth and improved people's lives in countless ways. However, the growing dependence on electronic products in households and workplaces has set a new environmental challenge, how to manage with the fastest growing waste stream (Charles et al., 2017). Liquid crystal displays (LCDs) are nowadays widely used in TVs, laptops, desktops and any other device coupled with a screen. LCD panels belong to waste electronic and electric equipment (WEEE) that contain a wide range of compounds, some of which are toxic or hazardous, whereas others like base and precious metals are valuable and can be recovered. Recovery of scarce resources like the critical raw materials was pointed out in many European policies, especially antimony, beryllium, cobalt, fluorspar, gallium, germanium, graphite, indium, magnesium, niobium, PGMs, rare earths, tantalum, tungsten (Ferella et al., 2017). Since that LCD contains an indium, a great efforts were made to find an appropriate treatment to extract indium as it was described in (Zhang et al., 2015). On the other hand, several research were conducted in order to examine a possibility of using a milled waste LCDs glass in concrete (Wang, 2011) and ceramic industry (Lin et al., 2009). Those research were conducted before the highlighting of the possibility of indium extraction from waste LCDs. Since that waste LCD glass has been shown as a good substitute for aggregate in concrete prior to indium extraction treatment, the purpose of this paper was to examine the properties of fresh and hardened concrete when a treated milled LCD is used as a substitute for aggregate in concrete and compare the results with the results of concrete when an untreated milled LCD is used as a substitute for aggregate in concrete.

recycling ; waste LCD ; concrete

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