Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time

고에너지 밀링으로 제조된 폐디스플레이 패널 분말의 밀링시간에 따른 인듐 용출특성

  • Kim, Hyo-Seob (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University) ;
  • Sung, Jun-Je (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University) ;
  • Lee, Cheol-Hee (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University) ;
  • Hong, Hyun-Seon (Plant Engineering Center, Institute for Advanced Engineering(IAE)) ;
  • Hong, Soon-Jik (Division of Advanced Materials Engineering & Institute for Rare Metals, Kongju National University)
  • 김효섭 (공주대학교 신소재공학과) ;
  • 성준제 (공주대학교 신소재공학과) ;
  • 이철희 (공주대학교 신소재공학과) ;
  • 홍현선 (고등기술연구원 플랜트엔지니어링센타) ;
  • 홍순직 (공주대학교 신소재공학과)
  • Received : 2011.06.13
  • Accepted : 2011.08.01
  • Published : 2011.08.28
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Abstract

In this research, the indium dissolution properties of the waste LCD panel powders were investigated as a function of milling time fabricated by high-energy ball milling (HEBM) process. The particle morphology of waste LCD panel powders changed from sharp and irregular shape of initial cullet to spherical shape with an increase in milling time. The particle size quickly decreased to 15 ${\mu}m$ until the first minute, then decreased gradually about 6 ${\mu}m$ with presence of agglomerated particles after 5 minutes, which increased gradually reaching a uniform size of 13 ${\mu}m$ consist of agglomerated particles after 30 minutes. The glass recovery, after dissolution, was over 99% at initial cullet, which decreased to 90.1 and 78.6% with increasing milling time of 1 and 30 minute respectively, due to a loss in remaining powder of the surface ball and jar, as well as the filter paper. The dissolution amount of indium out of the initial cullet was 208 ppm before milling, turning into 223 ppm for the mechanically milled powder after 1 minute, and nearly 146~125 ppm with further increase in milling time because of the reaction surface decrease of powders due to agglomeration. With this process, maximum dissolving indium amount (223 ppm) could be achieved at a particle size of 15 ${\mu}m$ with 1 minute of milling.

Keywords

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