title: Recovery of valuable components from waste LCD panel through a dry physical method.
abstract: A waste liquid crystal display (LCD) panel was recycled synthetically and cleanly by using dry physical methods, namely, mechanical exfoliation, dry crushing and vibrated gas-solid fluidized bed separation. Results of elemental and phase analyses show that indium and tin contents were enriched greatly in indium tin oxide concentrate obtained from colour filter and thin-film transistor glass. The results of crushing, ash content and scanning electron microscopic analyses show that when the LCD panel was crushed into particles smaller than 0.25mm, the polarizer film is nearly completely liberated from the glass. Moreover, the results of vibrated gas-solid fluidized bed separation show that gas velocity and separation time are the main factors influencing the separation. The vibration intensity of 6.8, gas velocity of 13.6cm/s and fluidizing time of 30s are the optimum operating parameters, and the degree of separation and recovery of polarizing film reached up to 37.69 and 72.3%, respectively. Based on these results, the combination of dry enrichment, dry crushing and dry separation in a flowsheet is proposed for recycling of waste LCD panel.
authors.affiliation: Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Wang
authors.affiliation: Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China. Electronic address: yqhe_cumt@126.com.
authors.forename: Yaqun
authors.initials: Y
authors.lastname: He
authors.affiliation: Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Advanced Analysis and Computation Center, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Guangwen
authors.initials: G
authors.lastname: Zhang
mesh_terms: D005898:Glass; D007204:Indium; D050866:Liquid Crystals; D059027:Recycling
chemical_list: D007204:Indium
keywords: Indium tin oxide (ITO); Mechanical exfoliation; Polarizer film; Vibrated gas–solid fluidized bed; Waste liquid crystal display (LCD)