Processing of end-of-life products (EoL) containing rare earth elements (REE) has gained increasing importance in recent years with the aim of avoiding supply risks. In addition, circular economy renders complete recirculation of technology metals mandatory. Fluorescent lamp wastes are an important source for REE recovery since they contain significant amounts, up to 55 wt%, of Y and Eu in red phosphors. For these purposes, solid-state chlorination (SSC) is an economically attractive alternative to wet acid leaching treatment, which profits from a considerable reduction of chemicals consumption and process costs. Chlorination takes place with dry HCl_(g) produced from thermal decomposition of NH₄Cl_(s), not only converting the REE content of the Hg-free phosphor waste into water soluble REE metal chlorides, but also avoiding the implications of aqueous complex chemistry of REE. To establish an industrial process viable on a commercial scale, the SSC process has been optimized by (i) using a design of experiment (DOE) varying temperature, residence time, and g_NH4Cl/g_solid ratio and (ii) improved leaching of the chlorinated metals with an organic mixture selective for REE. As a result, 95.7% of the Y and 92.2% of the Eu were selectively recovered at 295.9 °C, 67 min and a ratio of 1.27 g_NH4Cl/g_solid, followed by quantitative selective leaching of the REE. Owed to its low chemicals consumption and operation costs, the current process allows for valorizing lamp waste even when raw material prices are low.

近年来，为了避免供应风险，加工含稀土元素（REE）的报废产品（EoL）的重要性日益提高。此外，循环经济使技术金属必须完全再循环。荧光灯废料是REE回收的重要来源，因为它们在红色磷光体中含有大量的Y和Eu，含量高达55 wt％。出于这些目的，固态氯化法（SSC）是湿式酸浸处理的经济上有吸引力的替代方法，湿式酸浸处理得益于化学品消耗量和工艺成本的大幅降低。用NH ₄ Cl热分解产生的干HCl _{（g）进行}氯化_。不仅将无汞磷光体废料中的稀土元素含量转换为水溶性的稀土金属氯化物，而且避免了稀土的水络合物化学的影响。为了建立可行的工业规模的工业过程，通过（i）使用实验设计（DOE）改变温度，停留时间和g _NH4Cl / g_固体比和（ii）改进的浸出工艺对SSC工艺进行了优化。氯化金属和对稀土元素有选择性的有机混合物。结果，在295.9°C，67分钟和1.27 g _NH4Cl / g_固体的比率下，选择性地回收了95.7％的Y和92.2％的Eu。，然后进行定量选择性浸出REE。由于其较低的化学药品消耗和运营成本，即使原材料价格低廉，当前的工艺也可以使灯泡废料物有所值。