Journal
JOURNAL OF CLEANER PRODUCTION
Volume 151, Issue -, Pages 361-370Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.03.086
Keywords
Mechanical activation; Rare earth elements; Waste trichromatic phosphors; E-waste; Recovery
Categories
Funding
- National Natural Science Foundation of China [21407105]
- Shanghai Municipal Natural Science Foundation [14ZR1416700]
- SPU Graduate project fund [A01GY16F030]
- SPU Key Disciplines Subject [XXKZD1602]
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This research introduced a pretreatment process -mechanical activation- for extracting rare earth elements (REE) from waste trichromatic phosphors separated from e-waste. The effects of mechanical activation on the physicochemical properties of waste trichromatic phosphors were investigated using multiple methods by scanning electron microscopy (SEM), Brunauer-Emmett-Teller measurement (BET), particle size analysis, and X-ray diffraction (XRD). The results show that mechanical activation has noticeable effects on the microstructure of waste trichromatic phosphors. Increasing the rotational speed could cause the changes of S-A, structural defects, and breakage of the crystalline network, which could significantly improve in REE extraction rates. Specifically, changes in the crystalline degree of disorder caused by mechanical activation played a crucial role in enhancing the REE leachability from waste trichromatic phosphors. In addition, the sulfuric acid leaching behaviors of the activated waste trichromatic phosphors were studied by varying several parameters, including leaching time, liquid-to-solid ratio, acid concentration, heating temperature, and various activation conditions: Y, Eu, and Ce recovery rates reached approximately 96.3%, 91.1%, and 77.3%, respectively, from waste trichromatic phosphors activated for 60 min at the rotational speed of 550 rpm (by ball mill) compared with 46.7%, 42.3%, and 31.2%, respectively, from the raw sample. The method is promising to be put into practice to promote the recycling REE from various waste electric and electronic products. (C) 2017 Elsevier Ltd. All rights reserved.
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