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APPLICATION OF SUB-CRITICAL WATER FOR RECOVERY OF TIN AND GLASS SUBSTRATES FROM LCD PANEL E-WASTE

  • Hiroyuki Yoshida - Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia / Ecology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, Malaysia / Japan
  • Shamsul Izhar - Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia / Ecology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, Malaysia / Japan
  • Eiichiro Nishio - Environment Research and Development Center, Environmental Protection Group, Sharp Corporation, Japan
  • Yasuhiko Utsumi - Environment Research and Development Center, Environmental Protection Group, Sharp Corporation, Japan
  • Nobuaki Kakimori - Environment Research and Development Center, Environmental Protection Group, Sharp Corporation, Japan
  • Salak Asghari Feridoun - Ecology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, Japan

DOI 10.31025/2611-4135/2018.13738

Released under CC BY-NC-ND

Copyright: © 2018 CISA Publisher

Abstract

Tin and transparent glass substrate were efficiently recovered from color filter (CF) and thin-film transistor (TFT) glasses in LCD panel wastes using sub-critical water (sub-CW) at various treatment temperatures and reaction time. Treatment for 5 min using sub-CW added with NaOH resulted in a 95% recovery of tin from CF and TFT glasses. The tin oxide did not liquify in the liquid phase instead stayed in the organic multi-layers, which exfoliated together from the CF glass and TFT glass. This is a huge advantage because the organic multi-layers were readily separated by sub-CW and tin was recovered by filtration with ease. Transparent and clean glass was also recovered from LCD panel waste. The amount of tin oxide recovered depended on the sub-CW reaction temperature, reaction time and NaOH concentration. Treatment of smaller CF glass improved the recovery of tin. With this advance, we have showed that sub-CW method is technically feasible for tin oxide recovery in LCD waste.

Keywords

Editorial History

  • Received: 12 Jul 2018
  • Revised: 19 Sep 2018
  • Accepted: 14 Nov 2018
  • Available online: 22 Nov 2018

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