Ferella Francesco, Belardi Girolamo, Marsilii Antonella, De Michelis Ida, Vegliò Francesco
Department of Industrial Engineering, Information and Economics, University of L'Aquila, Via G. Gronchi 18, 67100 L'Aquila, Italy.
Institute of Environmental Geology and Geo-Engineering (IGAG-CNR), Via Salaria km 29,300, 00015 Monterotondo, Roma, Italy.
Waste Manag. 2017 Feb;60:569-581. doi: 10.1016/j.wasman.2016.12.030. Epub 2016 Dec 27.
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 HSO solution, 80°C, 10%vol HO, 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 HSO solution, at room temperature and S/L of 40%wt/vol.
本文探讨了用于拆解废旧液晶显示器（LCD）并进一步回收塑料、玻璃和铟等有价值组分的物理机械预处理方法。经过广泛的实验研究，设计、测试并优化了两种工艺。在湿法工艺中，进料面板按重量计分别有20%、15%和40%回收为塑料、玻璃和铟精矿。相反，在干法工艺中，仅分离出两种组分：按重量计约11%和85%分别回收为塑料和玻璃/铟混合物。铟富集在-212μm的组分中，通过硫酸浸出（0.75mol/L H₂SO₄溶液，80°C，10%体积的H₂O₂，矿浆密度10%重量/体积，浸出时间3小时）可将其完全溶解。在室温及pH值为3的条件下，用5%重量/体积的Amberlite™树脂在24小时内可从浸出液中萃取100%的铟。然后在室温及固液比为40%重量/体积的条件下，用2mol/L H₂SO₄溶液从树脂中反萃铟。
