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<p>With fluorescent lights (FL) being phased out, exploiting end-of-life and stockpiled lamps is crucial to prevent the loss of critical REEs embedded in their phosphor coatings. Recycling FL phosphor will support sustainable waste management and help meet domestic demand for these critical metals. The present study highlights systematic FL recycling for sustainable resource recovery. Acid-soluble phases of Y and Eu were recovered using direct acid leaching after separating non-RE phases. The dissolved Eu was recovered as EuSO<sub>4</sub> using Zn reduction and precipitation process, followed by recovery of Y from the filtrate as a double sulfate salt. The Y/Eu-leached residue was further processed to recover La, Ce, and Tb using peroxide fusion-water leaching and subsequent acid leaching process. The acid leaching process extracted 97% Ce, Tb, and 99.7% La from the phosphor residue, which were precipitated as mixed oxalate and calcined to recover mixed RE oxide. Based on the material balance, 1 MT of phosphor residue can be processed to recover 570&#xa0;kg NaY(SO<sub>4</sub>)<sub>2</sub>·H<sub>2</sub>O, 16&#xa0;kg EuSO<sub>4</sub>, and 63&#xa0;kg (La, Ce, Tb) mixed oxide using the proposed multi-stage process.</p> Graphical Abstract <p></p>

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Hydrometallurgical Recovery of Critical Metal Values from Heterogeneous Trichromatic Phosphor Waste

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Manish Kumar Sinha,
  • Himanshu Tanvar,
  • Brajendra Mishra

摘要

With fluorescent lights (FL) being phased out, exploiting end-of-life and stockpiled lamps is crucial to prevent the loss of critical REEs embedded in their phosphor coatings. Recycling FL phosphor will support sustainable waste management and help meet domestic demand for these critical metals. The present study highlights systematic FL recycling for sustainable resource recovery. Acid-soluble phases of Y and Eu were recovered using direct acid leaching after separating non-RE phases. The dissolved Eu was recovered as EuSO4 using Zn reduction and precipitation process, followed by recovery of Y from the filtrate as a double sulfate salt. The Y/Eu-leached residue was further processed to recover La, Ce, and Tb using peroxide fusion-water leaching and subsequent acid leaching process. The acid leaching process extracted 97% Ce, Tb, and 99.7% La from the phosphor residue, which were precipitated as mixed oxalate and calcined to recover mixed RE oxide. Based on the material balance, 1 MT of phosphor residue can be processed to recover 570 kg NaY(SO4)2·H2O, 16 kg EuSO4, and 63 kg (La, Ce, Tb) mixed oxide using the proposed multi-stage process.

Graphical Abstract