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Intensive Leaching of Red Phosphor Rare Earth Metals from Waste Fluorescent Lamp: Parametric Optimization and Kinetic Studies

  • Recovery of Rare Earth and Critical Metals from Unconventional Sources
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Abstract

Waste fluorescent lamps containing a significantly high quantity of rare earth metals have great potential to be an unconventional source of critical metals if exploited efficiently for resource recovery. Therefore, the present study dealt with the selective leaching of red phosphor rare earths from waste fluorescent lamps. The parametric effects of the acid media and their concentrations, addition of H2O2, pulp density, temperature, and time were studied. The results revealed that 2.0 M HCl with 5 vol.% H2O2 yielded 100% yttrium and more than 95% europium compared to only 92% and 96% yttrium and 89% and 91% europium while using H2SO4 and HNO3, respectively. The green phosphor compounds Ce0.67Tb0.33MgAl11O19 and (La0.65Ce0.15Tb0.2)PO4 were undissolved in a residual mass that can be handled separately. Kinetics data followed logarithmic rate law, and the chemically-controlled mechanism was indicated by the values of apparent activation energy (i.e., Ea(Y), 87.8 kJ/mol and Ea(Eu), 54.1 kJ/mol).

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Acknowledgements

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Project Nos. 2020R1A6A3A13073210 and 2020R1I1A1A01074249) and by the Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2019H1D3A2A02101993). The authors are thankful to Dr. Dipti Tanna for the language editing support.

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Authors and Affiliations

  1. Department of Environment and Energy, Jeonbuk National University, Jeonju, 54896, Republic of Korea

    Sowon Choi & Hyunjung Kim

  2. Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju, 54896, Republic of Korea

    Sadia Ilyas & Hyunjung Kim

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  1. Sowon Choi
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  2. Sadia Ilyas
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Choi, S., Ilyas, S. & Kim, H. Intensive Leaching of Red Phosphor Rare Earth Metals from Waste Fluorescent Lamp: Parametric Optimization and Kinetic Studies. JOM 74, 1054–1060 (2022). https://doi.org/10.1007/s11837-021-05112-z

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