A novel method for leaching rare earth element from fluorescent lamp waste via acid fusion

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Hydrometallurgy Pub Date : 2024-11-14 DOI:10.1016/j.hydromet.2024.106420

Guilherme Vieira Vaz , Fernanda Veronesi Marinho Pontes , Lucas André Bezerra Salgado , Manuel Castro Carneiro , Jéssica Frontino Paulino

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Abstract

Spent fluorescent lamps are alternatives to primary sources of rare earth elements. For recycling, the most common hydrometallurgical processes involve leaching with mineral acids, combined or not with alkaline fusion, which must be followed by another acidic leaching step for terbium, cerium, and lanthanum recovery. This study proposes a novel method employing acid fusion with potassium pyrosulfate (K₂S₂O₇) and leaching with water at 25 °C. A full factorial design (2³) was employed to study the following variables for the fusion process: temperature (450–550 °C), flux/sample mass ratio (2.2–3.0), and time (30–120 min). Under the optimal experimental conditions, the maximum recovery for La was 56.0 %. Recoveries were close to or greater than 70 % for Y, Ce, Eu, and Tb, at lower temperatures compared to those used in alkaline fusion, without the need for additional reagents and heating in the REE leaching step after fusion.

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通过酸融合从荧光灯废料中萃取稀土元素的新方法

废荧光灯是稀土元素主要来源的替代品。在回收利用方面，最常见的湿法冶金工艺是用矿物酸浸出，无论是否结合碱熔，都必须再经过一个酸性浸出步骤才能回收铽、铈和镧。本研究提出了一种新方法，即使用焦硫酸钾（K2S2O7）进行酸熔，并在 25 °C 下用水浸出。采用全因子设计法（23）研究了熔融过程的以下变量：温度（450-550 ℃）、通量/样品质量比（2.2-3.0）和时间（30-120 分钟）。在最佳实验条件下，La 的最大回收率为 56.0%。与碱性熔融法相比，在较低的温度下，Y、Ce、Eu 和 Tb 的回收率接近或超过 70%，而无需在熔融后的 REE 沥滤步骤中使用额外的试剂和加热。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.