ABSTRACT

Ultraviolet (UV) rays are produced during operation of fluorescent lamps (FLs). Fluorescent coating, also known as phosphor, converts UV rays to visible light. Various chemical compounds, individually or mixed in certain weight ratio, are used as phosphor. Phosphor prepared from rare earth (RE) compounds is energy-efficient. Various components including phosphor are meant to be recycled from FLs once they cease to operate. Review of literatures related to recycling of phosphor suggested that few papers were published prior to 2009. However, there was avalanche of relevant research articles in the next decade. Although RE phosphors were developed in 70s, their use in FLs gained market only after 2009 when energy protection agency passed a resolution to increase the efficiency of the lamps. In the last decade, researchers have done massive work on recycling of phosphor. In the mean time, they switched from one extractive technique to another to overcome the limitations of the former process. In this review, we have investigated the need of switching from one technique to another. We discovered the gaps in these literatures and proposed what needs to be done to fill these gaps. Flow-sheets prepared by compiling the most efficient techniques have been proposed at the end.

摘要

在荧光灯（FL）运行期间会产生紫外线（UV）。荧光涂层，也称为荧光粉，可将紫外线转换为可见光。单独地或以一定重量比混合的各种化学化合物用作磷光体。由稀土（RE）化合物制备的磷光粉节能。包括磷光体在内的各种成分一旦停止运行就可以从FL中回收。对与荧光粉回收相关的文献的评论表明，在2009年之前很少发表论文。但是，在接下来的十年中，相关研究文章大量涌现。尽管可再生能源荧光粉是在20世纪70年代开发的，但直到2009年能源保护机构通过一项决议以提高灯的效率后，才将其用于荧光灯中。在过去的十年中 研究人员在回收磷光体方面做了大量工作。同时，他们从一种提取技术转向另一种提取技术，以克服前一种方法的局限性。在这篇综述中，我们研究了从一种技术切换到另一种技术的需求。我们发现了这些文献中的空白，并提出了需要做些什么来填补这些空白。最后提出了通过汇编最有效的技术准备的流程图。