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As fluorescent lamps (FLs) areRare Earth graduallyHydrometallurgical processing discontinued, recyclingRecycling end-of-life and stockpiled units becomes essential to conserve the critical rare earth elements (REEsRare earth elements (REEs)) contained within their phosphor coatings. Recovering these metalsMetal supports both sustainable waste recyclingRecycling and reduces reliance on primary REERare earth elements (REEs) supplies. This study details a systematic recyclingRecycling process for maximal REERare earth elements (REEs) extractionExtraction. The process begins with separating non-REERare earth elements (REEs) phases, followed by temperature-controlled acid leachingLeaching to dissolve yttrium (Y) and europium (Eu). Eu was selectively precipitated from the leach liquor as EuSO4, while Y is recovered as a double sulfate saltSalts. The residual solid underwent peroxide fusion, water leachingWater leaching, and acid leachingLeaching to extract lanthanum (La), cerium (Ce), and terbium (Tb). A separationSeparation process was established to isolate individual RE-products from the leach solutionSolution, involving Ce oxidationOxidation-precipitation followed by Tb and La recovery via solvent extractionSolvent extraction. A comprehensive flowsheet was developed to reclaim critical REEsRare earth elements (REEs) from FL phosphor dust sustainably.

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Hydrometallurgical Processing of Waste Fluorescent Lamps Phosphor Dust for Rare Earth Recovery

  • 会议论文

  • 发表日期：

    2026年

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

摘要

As fluorescent lamps (FLs) areRare Earth graduallyHydrometallurgical processing discontinued, recyclingRecycling end-of-life and stockpiled units becomes essential to conserve the critical rare earth elements (REEsRare earth elements (REEs)) contained within their phosphor coatings. Recovering these metalsMetal supports both sustainable waste recyclingRecycling and reduces reliance on primary REERare earth elements (REEs) supplies. This study details a systematic recyclingRecycling process for maximal REERare earth elements (REEs) extractionExtraction. The process begins with separating non-REERare earth elements (REEs) phases, followed by temperature-controlled acid leachingLeaching to dissolve yttrium (Y) and europium (Eu). Eu was selectively precipitated from the leach liquor as EuSO4, while Y is recovered as a double sulfate saltSalts. The residual solid underwent peroxide fusion, water leachingWater leaching, and acid leachingLeaching to extract lanthanum (La), cerium (Ce), and terbium (Tb). A separationSeparation process was established to isolate individual RE-products from the leach solutionSolution, involving Ce oxidationOxidation-precipitation followed by Tb and La recovery via solvent extractionSolvent extraction. A comprehensive flowsheet was developed to reclaim critical REEsRare earth elements (REEs) from FL phosphor dust sustainably.