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Study On Preparation And Performance Of Foam Glass From Waste TFT-LCD Glass

Posted on:2016-01-04Degree:MasterType:Thesis
Country:ChinaCandidate:L L SheFull Text:PDF
GTID:2191330461996151Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
The scrapped peak period of liquid crystal display (LCD) is coming in China. As one of the key raw materials of waste liquid crystal display (TFT-LCD) panel, glass had not only a huge amount, but also a certain comprehensive utilization value. Because of the lack of recy-cling technology of waste TFT-LCD glass, the study on resource recovery of waste TFT-LCD glass is urgently required. On the basis of study on stripping the polarizer from waste TFT-LCD panel by chemical methods, thesis exploring the influence of sintering temperature, blowing agents and so forth in the preparation of foam glass by waste TFT-LCD panel glass. And the main impact factors of product performance were regulated in view of foam glass preparation mechanism. Eventually, preparation technology of foam glass by waste TFT-LCD glass was developed.Under the conditions of certain temperatures and NaOH solvent, the efficient strip of po-larizer from waste TFT-LCD panel was achieved by ultrasonic cavitation. The flaking time of polarizer was influenced by ultrasonic frequency and temperature. It only required 37 minutes when the ultrasonic frequency was 45KHz, temperature was 70℃ and concentration of NaOH was 0.1 mol/L.Foaming agent was one of the important factors which affect properties of foam glass produced by waste TFT-LCD glass. When carbon black was used as foaming agent, pore sizes of foam glass were uneven and density of product was high. The foam glass with more uni-form pores were produced at 1050~1200℃when silicon carbide was selected as foaming agent. The sintering temperature can be effectively reduced by 100~150℃by the addition of ordinary waste glass. And the bulk density of products dropped from 0.379-0.602 g/cmJ to 0.221~0.384g/cm3. Furthermore, the sintering temperature and the glass particle size were al- so important factors which affecting the performance of product. The foam glass produced by waste TFT-LCD glass had the lowest bulk density and optimum pore structure at 1100℃, and the foam glass produced by waste TFT-LCD glass and ordinary waste glass had the lowest bulk density and optimum pore structure at 1000℃ when the grain size of glass below 160mesh.The experiment results of foam glass indicated that the bulk density of the foam glass showed an overall decreasing trend with the increase of the amount of foaming agent and ox-ygen supply agent. Compressive strength and bulk density of foam glass were positively cor-related. The foam glass, which was produced by waste TFT-LCD glass at the optimal condi-tions, had excellent physical properties with density of 0.434g/cm3, porosity of 82.60% and compressive strength of 2.42MPa. The foam glass, which was produced by waste TFT-LCD glass and ordinary waste glass at the optimal conditions, had excellent physical properties with density of 0.221 g/cm3, porosity of 91.35% and compressive strength of 1.39MPa.
Keywords/Search Tags:waste TFT-LCD, panel, glass, resource recovery, foam glass
PDF Full Text Request
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