Study on alkali mechanical activation for recovering rare earth from waste fluorescent lamps

Recycling of rare earth from waste fluorescent lamps is becoming increasingly important in future sustainable development. However, cerium and terbium are usually difficult to recover due to the stable spinel structure. In the research, alkali mechanical activation was innovatively used to pretreat...

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Bibliographic Details
Published inJournal of rare earths Vol. 36; no. 1; pp. 108 - 112
Main Authors He, Ling, Ji, Wen, Yin, Yanwei, Sun, Weimin
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2018
Subjects
Alkali mechanical activation
Rare earth
Rare earths
Recovery rate
Spinel structure
Waste phosphors
Recovery rate
Waste phosphors
Rare earth
Rare earths
Alkali mechanical activation
Spinel structure
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Summary:Recycling of rare earth from waste fluorescent lamps is becoming increasingly important in future sustainable development. However, cerium and terbium are usually difficult to recover due to the stable spinel structure. In the research, alkali mechanical activation was innovatively used to pretreat the waste phosphors for recovering rare earths. The effect of alkali mechanical activation on the structural changes of waste phosphors was explored using X-ray diffraction （XRD） and Fourier transform infrared spec- troscopy （FFIR）. Meanwhile, the effects of different parameters including milling speed, activation time, and amount of alkali on the leaching rates of rare earth were investigated. The rare earth elements re- covery rates are observed to increase rapidly, particularly with increases in rotational speed and acti- vation time. Under optimal conditions, the maximum leaching rates of Ce and Tb reach 85.0% and 89.8%, respectively. And the total recovery rates of rare earth reach 95.2%. All the results indicate that alkali mechanical activation can effectively destroy the spinel structure and produce substantial physico- chemical changes. These changes lead to the easy dissolution of rare earths in acid solution, and greatly improve the leaching of cerium and terbium.
Bibliography:11-2788/TF
Ling He a, b, , Wen Ji a, Yanwei Yin a Weimin Sun a, b a （State Key Laboratory of Aclvanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China b School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China）
Recycling of rare earth from waste fluorescent lamps is becoming increasingly important in future sustainable development. However, cerium and terbium are usually difficult to recover due to the stable spinel structure. In the research, alkali mechanical activation was innovatively used to pretreat the waste phosphors for recovering rare earths. The effect of alkali mechanical activation on the structural changes of waste phosphors was explored using X-ray diffraction （XRD） and Fourier transform infrared spec- troscopy （FFIR）. Meanwhile, the effects of different parameters including milling speed, activation time, and amount of alkali on the leaching rates of rare earth were investigated. The rare earth elements re- covery rates are observed to increase rapidly, particularly with increases in rotational speed and acti- vation time. Under optimal conditions, the maximum leaching rates of Ce and Tb reach 85.0% and 89.8%, respectively. And the total recovery rates of rare earth reach 95.2%. All the results indicate that alkali mechanical activation can effectively destroy the spinel structure and produce substantial physico- chemical changes. These changes lead to the easy dissolution of rare earths in acid solution, and greatly improve the leaching of cerium and terbium.
Rare earthSpinel structureRecovery rateAlkali mechanical activationWaste phosphorsRare earths
ISSN:1002-0721
2509-4963
DOI:10.1016/j.jre.2017.05.016