Disposing of liquid crystal display (LCD) waste has significant effects on the environment, human and animal health, and metal resources by extension if inappropriately treated. In this study, we have developed a process for the separation of indium–tin oxide (ITO) glass from the LCD panel and evaluated the best digestion process for the analysis of In and Sn from ITO glass. The digestion process of scrap LCD in this work involves the separation of the polarizing film from ITO glass by environmentally friendly cold thermal shock method with liquid nitrogen, the removal of liquid crystals between the ITO glass substrates by ultrasonic cleaning, and the analysis of In and Sn from ITO glass by acid digestion method with a suitable reagent. Various brands of scrap LCDs were treated with six different digestion methods to determine In and Sn concentrations. The result of this study indicates that aqua-regia digestion procedure was the best method for the analysis of In and Sn. The concentrations of In and Sn in various brands of LCDs were in the range of 233–332 mg/kg and 43–421.5 mg/kg, respectively. Further, the analysis of In and Sn metals at different locations of the same scrap LCD was also carried out and it was observed that the concentrations of these metals (In—0.0278–0.0369% and Sn—0.0033–0.0078%) were significantly similar, with slight variations in their percentages.

中文翻译：

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重金属消化法分析废旧液晶显示玻璃中的铟和锡。

如果处理不当，处置液晶显示器（LCD）废物会对环境，人类和动物健康以及金属资源产生重大影响。在这项研究中，我们开发了一种从LCD面板分离铟锡氧化物（ITO）玻璃的方法，并评估了用于分析ITO玻璃中In和Sn的最佳消解工艺。在这项工作中，废LCD的消解过程涉及通过环境友好的冷热冲击法和液氮从ITO玻璃中分离出偏振膜，通过超声清洗去除ITO玻璃基板之间的液晶，以及分析In和In。用合适的试剂通过酸消解法从ITO玻璃中提取锡。用六种不同的消解方法处理了各种品牌的废旧LCD，以确定In和Sn的浓度。这项研究的结果表明，王水区消解程序是分析In和Sn的最佳方法。各种品牌的LCD中In和Sn的浓度分别在233–332 mg / kg和43–421.5 mg / kg的范围内。此外，还对同一废旧LCD的不同位置的In和Sn金属进行了分析，结果发现这些金属的浓度（In-0.0278-0.0369％和Sn-0.0033-0.0078％）非常相似，百分比略有变化。各种品牌的LCD中In和Sn的浓度分别在233–332 mg / kg和43–421.5 mg / kg的范围内。此外，还对同一废旧LCD的不同位置的In和Sn金属进行了分析，结果发现这些金属的浓度（In-0.0278-0.0369％和Sn-0.0033-0.0078％）非常相似，百分比略有变化。各种品牌的LCD中In和Sn的浓度分别在233–332 mg / kg和43–421.5 mg / kg的范围内。此外，还对同一废旧LCD的不同位置的In和Sn金属进行了分析，结果发现这些金属的浓度（In-0.0278-0.0369％和Sn-0.0033-0.0078％）非常相似，百分比略有变化。