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Processing End-of-Life Tube Lights for Recovery of Rare Earth Oxides

  • Pyrometallurgical Processing of Secondary Resources
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Abstract

The investigation of secondary rare earth sources is attractive because of environmental concerns, economic benefits, and resource conservation. The present work investigates milling/mechanical activation, chemical and thermal (microwave) treatment for rare earth recovery from trichromatic phosphor of spent tubular lights. Ball milling prior to acid leaching of phosphor recovered 82% Y, 41% La, 33% Ce, 97% Eu, and 32% Tb. The activation energy for the thermal decomposition of the phosphor was determined as 498.9 kJ mol−1, 381.6 kJ mol−1, and 202.2 kJ mol−1 for Na2CO3, NaOH, and CaCl2, respectively. Mechanical activation with Na2CO3 reduced the decomposition temperature for microwave processing and yielded 99% Y, 97% La, 0.6% Ce, 99% Eu, and 80% Tb values. Direct leaching yielded 39 g Y-Eu oxide product; ball milling and the mechanical activation followed by acid leaching yielded 52 and 89 g of Y-Eu-La-Ce-Tb oxides, respectively, from the processing of 100 units of end-of-life tubular units.

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Acknowledgements

The authors would like to thank the Indian Institute of Technology, Roorkee for providing financial assistance via the Faculty Initiation Grant.

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  1. Extractive Metallurgy Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology, IIT-Roorkee, Uttarakhand, 247667, India

    Neha Shukla & Nikhil Dhawan

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Shukla, N., Dhawan, N. Processing End-of-Life Tube Lights for Recovery of Rare Earth Oxides. JOM 73, 1090–1102 (2021). https://doi.org/10.1007/s11837-021-04588-z

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