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Extraction of Indium-Tin Oxide From End-Of-Life LCD Panels Using Ultrasound Assisted Acid Leaching

Extraction of Indium-Tin Oxide From End-Of-Life LCD Panels Using Ultrasound Assisted Acid Leaching

Malika Souada, Christophe Louage, Jean-Yves Doisy, Ludivine Meunier, Abdelkader Benderrag, Baghdad Ouddane, Séverine Bellayer, Nicolas Nuns, Michel Traisnel, Ulrich Maschke

Ultrason Sonochem. 2018 Jan;40(Pt A):929-936.

PMID: 28946505

Abstract:

In this report, indium-tin-oxide (ITO)-layer extraction from end-of-life (EOL) Liquid Crystal Displays (LCDs) was discussed by sulfuric acid leaching with simultaneous application of ultrasonication on the ITO-side of glass/ITO panels, exhibiting various dimensions. Applying this technique presents several advantages compared to the traditional leaching process such as fast and controllable kinetics, high extraction yield of indium and tin, selective recovery of these two metals possible, and the opportunity to recycle the neat glass separately avoiding additional separation processes. ITO-dissolution kinetics from EOL LCD panels were investigated as function of leaching time and acidity of sulfuric acid. At a temperature of 60°C, a nearly quantitative indium yield was obtained using an acid concentration of 18mol/L by simultaneous application of ultrasonication, whereas only 70% were recovered in the absence of ultrasound. Results from ICP-AES agreed well with SEM/BSE observations demonstrating the high efficiency of the ultrasound assisted process since only 3-4min were required to obtain maximum ITO recovery.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP50926119	Indium tin oxide		50926-11-9	Price

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