本文選題：LCD　切入點：ITO玻璃　出處：《合肥工業(yè)大學》2014年碩士論文　論文類型：學位論文

【摘要】：液晶顯示器（LCD）的全球出貨量在2007年首超傳統(tǒng)的陰極射線管顯示器（CRT），現(xiàn)已逐步取代傳統(tǒng)的CRT顯示器。隨著全球資源的不斷枯竭，廢舊電子電器產(chǎn)品的回收再利用引起了人們的廣泛關注。對廢棄液晶顯示器的回收再利用已引起國內外眾多研究機構的高度重視。本文以TFT-LCD型液晶顯示器的ITO玻璃為研究對象，研究其再資源化技術。 首先，基于動力學和熱力學分析了液晶顯示器ITO玻璃中ITO的浸出特性，確定了鍍層浸出所必須達到的pH值，對ITO鍍層的溶解特性從三個方面進行了研究：一是研究了ITO玻璃在不同酸性體系下的溶解特性；二是研究了ITO玻璃在酸溶液中浸出的最佳酸度；三是研究了ITO玻璃的粒度與ITO溶解率的關系。實驗結果表明，ITO在酸性溶液中具有較好的溶解特性，8mol/L為ITO最佳浸出酸度，ITO玻璃的粒度與其溶解率的關系不大。 其次，基于ITO玻璃基板的物理特性、化學組分和生產(chǎn)工藝，采用氫氟酸對ITO玻璃基板的表面進行了除雜實驗。結果表明，ITO玻璃在氫氟酸溶液（HF：H2O=1：2）中浸泡120min即能將鍍層全部去除。采用回收的ITO玻璃基板制取再生玻璃試樣，并對再生玻璃的性能進行了檢測。結果顯示，再生玻璃試樣的密度小、硬度高、熱膨脹系數(shù)小，具有質輕、力學性能好等優(yōu)點，回收利用價值高。 最后，根據(jù)稀貴金屬銦提取的常規(guī)流程，采用氫氟酸溶液對ITO玻璃的表面進行腐蝕和溶解，對含銦溶液進行富集和濃縮得到置換前液，再用鋁片從置換前液中置換出海綿銦，并用熔融的氫氧化鈉對海綿銦進行熔煉，制得了純度93%左右的粗銦，通過電解獲得了高純度的單質銦。
[Abstract]:In 2007, the first ultra-conventional cathode ray tube display (CRT) for liquid crystal display (LCD) was shipped around the world, and it has gradually replaced the traditional CRT display. The recovery and reuse of waste electronic and electrical products has attracted widespread attention. The recycling of waste liquid crystal display (LCD) has attracted great attention from many research institutions at home and abroad. In this paper, the ITO glass of TFT-LCD LCD is taken as the research object. To study its reuse technology. Firstly, the leaching characteristics of ITO in liquid crystal display (ITO) glass were analyzed based on kinetics and thermodynamics, and the pH value needed for coating leaching was determined. The dissolution characteristics of ITO coating were studied from three aspects: first, the dissolution characteristics of ITO glass in different acid systems, secondly, the optimum acidity of ITO glass leaching in acid solution. Third, the relationship between the particle size of ITO glass and the dissolution rate of ITO is studied. The experimental results show that there is no significant relationship between the particle size of ITO glass and the dissolution rate of ITO glass with the optimum leaching acidity of 8 mol / L in acid solution. Secondly, based on the physical properties, chemical composition and production process of ITO glass substrate, The surface of ITO glass substrate was treated with hydrofluoric acid. The results showed that the coating could be completely removed by soaking the glass in hydrofluoric acid solution (HFH: H2O 1: 2) for 120min. The recycled ITO glass substrate was used to prepare the regenerated glass sample. The results show that the recycled glass has low density, high hardness, small coefficient of thermal expansion, light weight, good mechanical properties and high recycling value. Finally, according to the routine process of extracting indium from rare and precious metal, the surface of ITO glass was corroded and dissolved by hydrofluoric acid solution, the indium solution was enriched and concentrated to obtain the pre-replacement liquid, and the sponge indium was replaced with aluminum sheet from the solution before replacement. The sponge indium was melted with molten sodium hydroxide, and the crude indium with purity of about 93% was obtained, and the high purity indium was obtained by electrolysis.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN873.93

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