废弃液晶显示器ITO玻璃的资源化技术研究

发布时间：2018-03-11 02:23

本文选题：LCD　切入点：ITO玻璃　出处：《合肥工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：液晶显示器（LCD）的全球出货量在2007年首超传统的阴极射线管显示器（CRT），现已逐步取代传统的CRT显示器。随着全球资源的不断枯竭，废旧电子电器产品的回收再利用引起了人们的广泛关注。对废弃液晶显示器的回收再利用已引起国内外众多研究机构的高度重视。本文以TFT-LCD型液晶显示器的ITO玻璃为研究对象，研究其再资源化技术。首先，基于动力学和热力学分析了液晶显示器ITO玻璃中ITO的浸出特性，确定了镀层浸出所必须达到的pH值，对ITO镀层的溶解特性从三个方面进行了研究：一是研究了ITO玻璃在不同酸性体系下的溶解特性；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玻璃的粒度与ITO溶解率的关系。实验结果表明，ITO在酸性溶液中具有较好的溶解特性，8mol/L为ITO最佳浸出酸度，ITO玻璃的粒度与其溶解率的关系不大。其次，基于ITO玻璃基板的物理特性、化学组分和生产工艺，采用氢氟酸对ITO玻璃基板的表面进行了除杂实验。结果表明，ITO玻璃在氢氟酸溶液（HF：H2O=1：2）中浸泡120min即能将镀层全部去除。采用回收的ITO玻璃基板制取再生玻璃试样，并对再生玻璃的性能进行了检测。结果显示，再生玻璃试样的密度小、硬度高、热膨胀系数小，具有质轻、力学性能好等优点，回收利用价值高。最后，根据稀贵金属铟提取的常规流程，采用氢氟酸溶液对ITO玻璃的表面进行腐蚀和溶解，对含铟溶液进行富集和浓缩得到置换前液，再用铝片从置换前液中置换出海绵铟，并用熔融的氢氧化钠对海绵铟进行熔炼，制得了纯度93%左右的粗铟，通过电解获得了高纯度的单质铟。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN873.93

【参考文献】