Abstract

Discarded tubular lights were crushed and sieved to retrieve phosphor powder comprising about 40% rare earth (Y, La, Ce, Eu, Tb) present in phosphor. In this study, different processing routes comprising direct leaching, leaching followed by thermal treatment, and thermal treatment are investigated for recovery of Y, Eu, Ce, Tb, and La. The heat treatment process was optimized at different microwave exposure time and compared with the conventional heat treatment. Leaching of Eu–Y values followed by microwave treatment of leach residue with sodium hydroxide was found promising for REEs extraction. Microwave route yielded 94% La, 9% Ce, 45% Eu, and 62% Tb extraction with 50% NaOH dosage and 87% La, 8%Ce, 65% Eu, and 95% Tb extraction on increasing NaOH dosage to 100%. The material balance shows that 50 g mixed oxide of Y, Eu, and ~ 11 g mixed oxide of La, Ce, Eu, Tb, Y with purity more than 97% are recovered from 100 units of discarded tubular lights. The adopted process is simple, adaptable, and can recover appreciable rare earth elements within a short time from discarded slim tube lights.

Graphical Abstract

中文翻译：

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从废弃管状灯中提取稀土的不同处理途径的研究

摘要

将废弃的管状灯粉碎并过筛，以回收磷光体粉末，其中包含磷光体中约40％的稀土（Y，La，Ce，Eu，Tb）。在这项研究中，研究了不同的处理途径，包括直接浸出，浸出后进行热处理以及热处理，以回收Y，Eu，Ce，Tb和La。热处理工艺在不同的微波暴露时间进行了优化，并与常规热处理。发现浸出Eu-Y值，然后用氢氧化钠对浸出残渣进行微波处理可用于REEs提取。微波途径通过将NaOH剂量增加到100％可以得到94％La，9％Ce，45％Eu和62％Tb萃取（50％NaOH剂量）和87％La，8％Ce，65％Eu和95％Tb萃取。 。物料平衡显示50 g的Y，Eu，从100单位废弃的管状灯中回收了约11 g纯度大于97％的La，Ce，Eu，Tb，Y的混合氧化物。所采用的过程简单，适应性强，可以在短时间内从废弃的细管灯中回收大量稀土元素。

图形概要