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 â212Â Î¼m fraction, was completely dissolved by sulphuric acid leaching (0.75Â molÂ Lâ1H2SO4solution, 80Â Â°C, 10%vol H2O2, pulp density 10%wt/vol, leaching time 3Â h). 100% of indium can be extracted from the pregnant solution with 5%wt/vol Amberliteâ¢ resin, at room temperature and pH 3 in 24Â h. Indium was thus re-extracted from the resin by means of a 2Â molÂ Lâ1H2SO4solution, at room temperature and S/L of 40%wt/vol.
|Titolo:||Separation and recovery of glass, plastic and indium from spent LCD panels|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|