Processing of discarded liquid crystal display for recovering indium

G. Dodbiba, K. Takahashi, T. Fujita, Nobuaki Sato, S. Matsuo, K. Okaya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Different materials are used for manufacturing various parts of a cellular phone. Considering that a great number of mobile phones are being discarded every year, it is important to recover these materials and then recycle them in order to save resources. The primary objective of this work is therefore to find and suggest ways on how to recover various materials from discarded cellular phones for recycling. Much effort, for example, has been put in recovering and recycling tin oxide (ITO), a mixture of indium (III) oxide, (In 2O3) and tin(IV) oxide from the discarded liquid crystal displays (LCDs). Here we report a simple and cost-effective process, which includes a HCl treatment process for altering the structure of the indium (III) compound into a chloride-induced indium compound, in order to facilitate the vaporization of indium at a relatively low temperature. The experimental results indicated that 96.2 % of indium can be recovered from ITO, when the sample was heated at 973 K for 90 minutes. In addition, some thermodynamic calculations were also carried out in order to better understand the mechanism for chloride-induced vaporization of indium.

Original languageEnglish
Title of host publicationRecycling of Electronic Waste II - Proceedings of the 2nd Symposium - Held During the TMS 2011 Annual Meeting and Exhibition
Pages11-16
Number of pages6
Publication statusPublished - 2011 Jul 27
Event2nd Symposium on Recycling of Electronic Waste II - Held During the TMS 2011 Annual Meeting and Exhibition - San Diego, CA, United States
Duration: 2011 Feb 272011 Mar 3

Publication series

NameTMS Annual Meeting

Other

Other2nd Symposium on Recycling of Electronic Waste II - Held During the TMS 2011 Annual Meeting and Exhibition
CountryUnited States
CitySan Diego, CA
Period11/2/2711/3/3

Keywords

  • (ITO)
  • Indium (In)
  • Indium tin oxide
  • Liquid crystal display (LCD)
  • Vaporization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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