Recovery of Indium from Waste Liquid Crystal Display Screen by Reduction Roasting Under H2-H2O Atmosphere

IndiumIndium is a strategic critical metal in manufacturing indium-tin oxide (ITO) thin films for LCD/LED screens. Nevertheless, indiumIndium in Earth’s crust is a rare dispersion with an average abundance of 0.02 ppm, which is difficult to recover from primary ore. Hence, scholars focused on Indium recoveryIndium recovery from waste LCD screensWaste LCD screen using hydrometallurgyHydrometallurgy technologies, which were always with long process. In this paper, a novel process for the separation and recoveryRecovery of indiumIndium from waste LCD by roasting under an H2-H2O atmosphere is proposed. Under optimal conditions, In2O3 can be reduced selectively to gaseous In2O, and then In2O can be recovered efficiently. The effects of roasting parameters on indium recoveryIndium recovery were studied utilizing thermodynamic analysisThermodynamic analysis, XRD, and ICP. The results showed that the indiumIndium in waste LCD can be reduced to In2O(g) under the H2-H2O atmosphere at 1100–1200 ℃, the recoveryRecovery of indiumIndium was up to 96.53% with an enrichment ratio of 3700.