首页>
外国专利>
METHOD FOR INDIVIDUAL RARE EARTH METALS RECYCLING FROM FLUORESCENT POWDER E-WASTES
METHOD FOR INDIVIDUAL RARE EARTH METALS RECYCLING FROM FLUORESCENT POWDER E-WASTES
展开▼
机译：含氟粉末电子废物中回收稀土金属的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A robust and economically viable process technology is developed for the recycling of critical rare earth elements (REEs) from end of life lamp fluorescent powder (FP) e-waste. This is one of the first efforts to recycle individual pure REEs from municipale-waste components to arrive at commercially promising individual REEs purity, which are knowingly difficult to separate from wastes. The process technology addresses the management of strategically important REEs resources relevant for green energy and smart/hybrid technology. The methodology involves cheap mineral acid for near quantitative REE metal's sequential digestion and extractive (liquid-liquid) separation protocols using the selective extractant ligand molecules and carefully designed hydrometallurgical process conditions to separate Y, Eu, and Tb, to more than 99% purity and Gd, La and Ce to elevated purities each from the metal digested FP waste fractions. The developed technology has potential for scale up on industrial scale, re-use of extractant and organic phase, as well as, extended use for recovering RE metals from other types of e- waste after optimizations. The process can be employed to REE mixtures from e-waste as well as mining tailings origin. The process has the advantage over earlier methods involving inseparably combined digested phosphor fractions as well as over inefficient leaching of Tb from LAP phosphor. It uses less complex organic extractants and lesser stages for the separation of the individually targeted REEs, such as onlyone extraction stage to achieve 99% pure Y from the digested YOX phosphor. It is also one of the first attempts to achieve individual high purity of rare earths raw materials from such a complex waste stream. The novel approach proposed herein with judicial choices of extractants and inventive steps of process hydrometallurgy will help to tap potential in e-waste secondary resources. The environmental benefit is important and possible due to the fact that the organic and acidic feeds are optimized throughout the process and could be re-used within the process.
展开▼
