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Optimized indium solubilization from LCD panels using H2SO4 leaching.

El Houssaine Moutiy1, Lan-Huong Tran1, Kristin K Mueller1

  • 1Institut National de la Recherche Scientifique (Centre Eau Terre Environnement), Université du Québec, 490 Rue de la Couronne, Québec, QC G1K 9A9, Canada.

Waste Management (New York, N.Y.)
|July 14, 2020
PubMed
Summary
This summary is machine-generated.

This study optimizes indium (In) recovery from spent liquid crystal displays (LCDs) using sulfuric acid leaching. The developed process achieves high indium solubilization efficiency, making recycling economically viable for large-scale operations.

Keywords:
Acid leachingBox–BehnkenIndiumIndium tin oxideLiquid-crystal display panelOptimization

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Area of Science:

  • Materials Science
  • Metallurgical Engineering
  • Environmental Science

Background:

  • Spent liquid crystal displays (LCDs) contain valuable strategic metals like indium (In).
  • Indium Tin Oxide (ITO) glass from discarded screens is a primary source for indium recovery.
  • Efficient recycling of electronic waste is crucial for resource sustainability.

Purpose of the Study:

  • To optimize the solubilization of indium (In) from indium tin oxide (ITO) glass sourced from LCD screens.
  • To determine the optimal conditions for sulfuric acid leaching of indium.
  • To assess the economic feasibility of the indium leaching process for industrial application.

Main Methods:

  • Utilized a Box-Behnken experimental design to optimize leaching parameters.
  • Investigated the influence of temperature, acid concentration, and pulp density on indium solubilization.
  • Employed sulfuric acid (H2SO4) leaching at optimized conditions.

Main Results:

  • Identified optimal conditions: 70°C, 0.4 N H2SO4, 30 min, and 50% pulp density for indium solubilization.
  • Achieved a predicted indium solubilization efficiency of 89.7% using a quadratic model.
  • Experimentally validated a high indium solubilization efficiency of 99.5%.

Conclusions:

  • The optimized sulfuric acid leaching process is highly effective for recovering indium from ITO glass.
  • The process is economically conceivable for high-capacity industrial plants processing significant amounts of ITO glass.
  • Recycling indium from spent LCDs presents a sustainable and valuable resource recovery pathway.