Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Evaluations of Life Cycle Assessment on Indium-Tin-Oxide Electrochemical Recycling Process

디스플레이 투명전극용 인듐-주석-산화물의 전기화학적 재활용 공정에 관한 전과정 평가

  • Kim, Raymund K.I. (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Lee, Na-Ri (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Lee, Soo-Sun (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Lee, Young-Sang (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Hong, Sung-Jei (Division of Energy-Display R&D, Korea Electronics Technology Institute) ;
  • Son, Young-Keun (Department of Chemistry, Sungkyunkwan University, Natural Science Campus) ;
  • Hong, Tae-Whan (Department of Materials Science and Engineering, Korea National University of Transportation)
  • 김경일 (한국교통대학교 신소재공학과 나노소재연구실) ;
  • 이나리 (한국교통대학교 신소재공학과 나노소재연구실) ;
  • 이수선 (한국교통대학교 신소재공학과 나노소재연구실) ;
  • 이영상 (한국교통대학교 신소재공학과 나노소재연구실) ;
  • 홍성제 (전자부품연구원 에너지디스플레이연구본부) ;
  • 손용근 (성균관대학교 화학과) ;
  • 홍태환 (한국교통대학교 신소재공학과 나노소재연구실)
  • Received : 2013.08.02
  • Accepted : 2013.10.18
  • Published : 2013.12.31
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Abstract

Iindium-tin-oxide (ITO) material was had to use in display application as transparent electrode. However it would be problems comes up, the depletion of indium, tin and energy consumption of production process. Therefore recently trend was demanded alternative ITO material and recycling/reused ITO. In this conditions, the environmental impact have to express correct value about recycling/reused ITO process. The life cycle assessment was valuable method in this process. Thus first step was carried out separating in/out put (material) sources and then, exactive data base (DB) was applied. The result of environment impact was calculated by affect categories and recycling rate was set to 34% (This value was measured in previous project). The rate (g) of ITO material was calculated by chemical equivalent. In result, environmental impact were revealed acidification potential and abiotic depletion and if do not recycle/reuse ITO, $ 476 per 1 ton waste in land.

현재 인듐-주석-산화물(Indium-Tin-Oxide, ITO)은 디스플레이 제품에 투명 전극으로 사용된다. 하지만 인듐과 주석의 자원고갈 문제와 ITO 제조 공정에 많은 에너지가 소비되어 최근에는 ITO 대체물질의 개발과 ITO 재사용 및 재활용에 관한 연구가 요구되고 있는 실정이다. 이러한 상황에서 ITO를 재활용 하게 되면 수치상으로 환경부하 값의 변화 추이를 확인하기 위해서는 전과정 평가 기법을 이용한 전과정 평가가 매우 적절하다. 따라서 전과정 평가 수행을 위해 공정상에서 투입물질과 생성물질을 구분하고, 데이터 베이스(DB)를 적용하여 환경성 평가 결과를 영향 범주별로 계산하였으며, 34%를 폐기함에 따라 각각 해당하는 환경부하 값이 계산되었다. 화학당량적으로 ITO의 양을 계산하여 환경부하 값을 결정할 경우, 산성 물질과 자원고갈에 해당하는 값들이 계산되었고, ITO를 1 ton 생산하여 34%를 폐기할 경우 $ 476를 땅에 묻는 결과가 도출되었다.

Keywords

References

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