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2012 | 21 | 6 |
Tytuł artykułu

Materials separation from waste liquid crystal displays using combined physical methods

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
With the liquid crystal displays (LCDs) being widely used in televisions, notebooks, and mobile phones, etc., large quantities of LCDs are entering into their end-of-life stage for treatment. If not treated properly, a loss of resources and undesirable impacts on the environment and human health can occur. In order to treat the waste LCDs in an efficient and environmentally friendly way, a combined process of physical methods was proposed to separate and recover materials from waste LCDs in the present study. On the basis of primary disassembly, two key processes (including liquid crystals removal and the recovery of polarizer and glass) were studied. Liquid crystals were removed from the panel glass by dissolving in isopropyl alcohol solution (16.7 vol.%) assisted with ultrasound. Recovery of polarizer and glass was achieved through mechanical crushing and gravity concentration. Results show that approximately 100 wt.% of liquid crystals were removed after dissolving for 45 min at 60ºC. Up to 79.7 wt.% of polarizer was separated from glass and its average content in the recovered product was 90.3 wt.%.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
21
Numer
6
Opis fizyczny
p.1921-1927,fig.,ref.
Twórcy
autor
  • State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China
autor
  • State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China
autor
  • State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China
autor
  • State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China
autor
  • State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, China
Bibliografia
  • 1. CHIEN Y.C., SHIH P.H. Emission of polycyclic aromatic hydrocarbons on the combustion of liquid crystal display components. J. Environ. Eng. – ASCE. 132, 1028, 2006.
  • 2. LEE S.J., COOPER J. Estimating regional material flows for LCDs. In: IEEE International Symposium on Electronics and the Environment - ISEE, IEEE publishing: New York, pp. 320-325, 2008.
  • 3. MARTIN R., SIMON-HETTICH B., BECKER W. Safe recovery of liquid crystal displays (LCDs) in compliance with WEEE. In: Electronics Goes Green 2004 (Plus): Driving Forces for Future Electronics, Proceedings, Fraunhofer IRB Verlag publishing: Stuttgart, pp. 147-150, 2004.
  • 4. WANG H.Y. A study of the effects of LCD glass sand on the properties of concrete. Waste Manage. 29, 335, 2008.
  • 5. LIN K.L., WANG N.F., SHIE J.L., LEE T.C., LEE C. Elucidating the hydration properties of paste containing thin film transistor liquid crystal display waste glass. J. Hazard. Mater. 159, 471, 2008.
  • 6. TAKAHASHI K., SASAKI A., DODBIBA G., SADAKI J., SATO N., FUJITA T. Recovering indium from the liquid crystal display of discarded cellular phones by means of chloride-induced vaporization at relatively low temperature. Mettal. Mater. Trans. A. 40A, 892, 2009.
  • 7. WANG H.Y., HUANG W.L. Durability of self-consolidating concrete using waste LCD glass. Constr. Build. Mater. 24, 1008, 2010.
  • 8. WANG H.Y., The effect of the proportion of thin film transistor–liquid crystal display (TFT–LCD) optical waste glass as a partial substitute for cement in cement mortar. Constr. Build. Mater. 25, 791, 2011.
  • 9. CUI J., FORSSBERG E. Mechanical recycling of waste electric and electronic equipment: a review. J. Hazard. Mater. B99, 243, 2003.
  • 10. QIN W.L. Method of recovering waste liquid crystal display. Chinese patent, NO. 03109487.2, 2004 [In Chinese].
  • 11. LI J.H., GAO S., DUAN H.B., LIU L.L. Recovery of valuable materials from waste liquid crystal display panel. Waste Manage. 29, 2033, 2009.
  • 12. MARTIN R. Use of liquid-crystal displays and processes for the recycling thereof. American patent, NO. US2007/0193414 A1. 2007.
  • 13. CHIEN Y.C., LIANG C.P., SHIH P.H. Emission of polycyclic aromatic hydrocarbons from the pyrolysis of liquid crystal wastes. J. Hazard. Mater. 170, 910, 2009.
  • 14. NANZAI B., OKITSU K., TAKENAKA N., BANDOW H., MAEDA Y. Sonochemical degradation of various monocyclic aromatic compounds: Relation between hydrophobicities of organic compounds and the decomposition rates. Ultrason. Sonochem. 15, 478, 2008.
  • 15. OKITSU K., SUZUKI T., TAKENAKA N., BANDOW H., NISHIMURA R., MAEDA Y. Acoustic multibubble cavitation in water: a new aspect of the effect of a rare gas atmosphere on bubble temperature and its relevance to sonochemistry. J. Phys. Chem. B. 110, 20081, 2006.
  • 16. MCNAMARA W.B., DIDENKO Y.T., SUSLICK K.S. Pressure during sonoluminescence. J. Phys. Chem. B. 107, 7303, 2003.
  • 17. PARK K.S., SATO W., GRAUSE G., KAMEDA T., YOSHIOKA T. Recovery of indium from In2O3 and liquid crystal display powder via a chloride volatilization process using polyvinyl chloride. Thermochim. Acta 493, 105, 2009.
  • 18. KANG H.N., LEE J.Y., KIM J.Y. Recovery of indium from etching waste by solvent extraction and electrolytic refining. Hydrometallurgy 110, 120, 2011.
  • 19. VIROLAINEN S., IBANA D., PAATERO E. Recovery of indium from indium tin oxide by solvent extraction. Hydrometallurgy 107, 56, 2011.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.agro-014d1de7-13cd-47cb-9d8b-a32d0a3d7bc7
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