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The liquid crystal display (LCD) industry has undergone drastic growth over the past decade. Considering that the lifetime of an LCD device is approximately ten years, a huge end LCD waste glass (ELWG) is being produced from end-of-life LCD devices. The recycling of ELWG derived from LCD device produced before 2011 is limited by the presence of toxic components such as As, Sb and Ba. In this work, the potential of recycling ELWG was examined to be used in the glass wool industry. 17 glass batches using four different simulated ELWGs (mixtures corresponding to LCD glasses produced in 2006, 2008, 2009, and 2010) were prepared and melted. ELWG was introduced up to 20% of the total glass. Two fixed viscosity points (Tm, Tw) corresponding to 102 and 103 dPas, and the liquidus temperature (TL) were determined in the melt state, and leaching tests of the glass powder in an acidic solution based on the toxicity characteristic leaching procedure (TCLP) were also carried out. As the ELWG content was increased, the Tm, Tw, and TL values did not show a linear relationship with the ELWG content, but some fluctuation in the values was observed. The Tm value showed a larger deviation of 28–36 °C from that of the original glass than the Tw (6–14 °C) and TL (2–16 °C) values. As and Sb were not detected in the leaching tests, and the Ba concentration (1.232–2.279 mg/L) was much lower than the TCLP regulatory level (100 mg/L). The observed TW-TL values suggested that the replacement of 20% or more of the total glass by ELWG is possible. Additionally, the economic and environmental effects of the recycling process were discussed.

Due to the drastic growth of the liquid crystal display (hereafter LCD) industry in the last decade, lots of waste glass is being produced. There are three types of waste glass derived from LCD glass manufacturers, LCD panel manufacturers and end-of-life LCD devices. Among them cullet from Lber glass (hereafter E-glass). However, the recycling of waste glass from LCD panel (LPWGCD glass is being recycled into a raw material for commercial electric continuous fi) and end waste glass is limited due to various reasons such as contaminants, toxic components and inhomogeneous glass compositions etc. Despite use of LPWG in the cement industry, it is not an effective form of recycling, considering the characteristics of LCD glass. In this work, to examine the possibility of recycling LPWG in the E-glass industry, several glass batches containing LPWG were prepared. First, some optical properties of the prepared and commercial E-glass were examined. Then, the viscosity and liquidus temperature (TL) were determined. The effect of LPWG was negligible in the transmission and color of the resultant glasses, considering that commercial bulk E-glass has an emerald-green color due to refractory corrosion. With an increase in the LPWG content, the isoviscosity and liquidus temperatures showed opposite behaviors; the temperature (TW) corresponding to the fiber forming viscosity (103 dPas) decreased, whereas the TL increased. Based on TW-TL, the replacement of 50 wt% of the original E-glass with LPWG was recommended. Additionally, economic and environmental effects were discussed.

The possibility of vitrifying the fly ash generated from municipal solid-waste incinerators and the immobilisation effect of toxic elements were investigated using several batches of fly ash and two kinds of common waste glass (waste glass from end liquid crystal display device and soda lime silicate waste glass). Fly ash could be vitrified by melting at 1300 °C prior to the introduction of a minimum of 30 wt% waste glass to each batch. Leaching tests were performed using the TCLP (Toxicity Characteristic Leaching Procedure) for three types of glass to identify the concentrations of five harmful elements (Pb, Ba, As, Cd, Cr) in the extraction fluid and a surface analysis using SIMS (Secondary Ion Mass Spectrometry) was performed to reveal the elemental distribution of the glass. The results confirmed that the regulatory levels (Pb

Alkali free alumino-borosilicate display glasses that serve as the window in a TFT-LCD (hereafter LCD) device not only have few impurities but also high homogeneity to guarantee the quality of the display. These characteristics of LCD glasses enable the possibility of recycling LCD glass cullet as a raw material for commercial soda lime silicate glasses from the perspectives of the raw material costs and the energy saving. In the present work, several batches containing LCD cullet for two commercial model glasses were prepared and melted in the laboratory. According to several properties of the melts and the glasses, there was no serious change in the properties with up to 9 wt% replacement of the flint glass and 11 wt% replacement of the low iron flat glass by the LCD cullet. Currently, LCD cullet is being used successfully in a number of industrial plants for the production of flint glass in Korea. Two-thirds of flint bottle glasses contain B2O3 component derived from LCD cullet.