Recovery of indium from indium tin oxide by solvent extraction

By S. Virolainen, Don Ibana, E. Paatero. 2011

222 citations recorded by the source corpus.

Abstract Recovery of indium from LCD screen wastes, which contain indium in the form of indium tin oxide (ITO) as the electrode material, is becoming economically and environmentally justified. Indium is a valuable metal and the present work was aimed to recover indium from ITO as the starting material to study the recovery of indium from waste LCD screens by solvent extraction. The apparent rate of dissolution in acidic media is slow requiring six hours for complete dissolution of the ITO sample in 1 M of either H2SO4 or HCl. Complete dissolution in HNO3 took significantly longer. The acid concentration was found to have a major effect on both the amount and rate of leaching allowing some leaching selectivity. Three solvent systems were chosen to study their selectivity for the separation of indium from tin: TBP, D2EHPA and a mixture of both. With either 1 M of TBP or 0.2 M of D2EHPA + 0.8 M of TBP, tin could be selectively extracted from a 1.5 M HCl solution of this metal. D2EHPA extracts both indium and tin from H2SO4 media but indium could be selectively stripped with HCl from the loaded D2EHPA. Based on these results, a scheme for separating and concentrating indium from ITO by solvent extraction is proposed. The scheme includes dissolving ITO into 1 M of H2SO4, then extracting indium and tin to D2EHPA followed by selective stripping of indium into 1.5 M of HCl. With this process, HCl solution containing 12.2 g/L of indium could be achieved.

Subfields: Environmental Engineering, Industrial and Manufacturing Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/ad9a4ff95f74d1575a80767d9876e31af5d1382c

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In Environmental Engineering

1. Gara Villalba
2. C. Licht
3. L. T. Peiró

In Industrial and Manufacturing Engineering

1. Gara Villalba
2. C. Licht
3. L. T. Peiró

In Mechanical Engineering

1. Gara Villalba
2. C. Licht
3. L. T. Peiró

Citations in the corpus

• Global Substance Flow Analysis of Gallium, Germanium, and Indium: Quantification of Extraction, Uses, and Dissipative Losses within their Anthropogenic Cycles (2015, methodology): “Laboratoryscale experiments proved the functionality of this technique (Virolainen et al. 2011).”