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Recovery of Indium from Scrap TFT-LCDs by Solvent Extraction

Elsevier B.V.
DOI: 10.1016/j.proenv.2012.10.075
  • Scrap Tft-Lcds
  • Indium
  • Solvent Extraction
  • D2Ehpa
  • Back-Extraction
  • Strip
  • Ecology
  • Economics
  • Geography


Abstract Recovery of indium from scrap LCDs, which contain indium in the form of indium tin oxide (ITO) films, is becoming economically and environmentally justified. Indium is a precious metal and the present study was aimed to recover indium from scrap TFT-LCDs by solvent extraction which was based upon H2SO4 acid leaching–D2EHPA extraction–HCl back extraction. The results showed that indium could be better leached in H2SO4 (1:1, v/v) acid solution in the optimal liquid/solid ratio of 1:1 while other metals’ leaching concentrations were relatively low. Indium could be selectively extracted from its H2SO4 solutions by 30% D2EHPA with O/A ratio of 1:5 within 5min, and be completely stripped by 4M HCl from D2EHPA with A/O ratio of 1:5, the final extraction efficiency achieved more than 97%.

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