Hydrometallurgical Recovery of Indium from Flat-Panel Displays of Spent Liquid Crystal Televisions

A recovery process for indium from waste liquid crystal display panels was developed on the basis of hydrometallurgical technology. The powdered sample was leached with 3 M HCl to extract its various metal constituents (indium, aluminum, tin, etc.). The mutual separation and subsequent recovery of the dissolved metals was achieved using two column adsorption tests: The first column was packed with a porous resin impregnated with Aliquat 336, a commercially available solvent extraction reagent based on a quaternary ammonium compound, and the resin contained in the second column was impregnated with Cyanex 923, also a commercially available solvent extraction reagent based on trialkylphosphine oxide. In the first column, tin, iron, and zinc were removed from the leach liquor. In the second column, only indium was selectively recovered. The metal ions trapped in these columns were eluted with 0.1 M H2SO4, yielding a solution purified indium solution with a concentration 10 times that of the feed solution.

基于湿法冶金技术开发了一种从废弃液晶显示面板中回收铟的工艺。将粉末状样品用3M盐酸浸出，以提取其各种金属成分（铟、铝、锡等）。通过两次柱吸附试验实现了溶解金属的相互分离和后续回收：第一个柱填充有多孔树脂，该树脂浸渍有Aliquat 336，这是一种基于季铵化合物的市售溶剂萃取试剂；第二个柱中所含的树脂浸渍有Cyanex 923，这也是一种基于三烷基氧化膦的市售溶剂萃取试剂。在第一个柱中，从浸出液中去除了锡、铁和锌。在第二个柱中，仅选择性地回收了铟。用0.1M硫酸洗脱这些柱中捕获的金属离子，得到的铟溶液浓度是进料溶液的10倍。