NDLI: Recovery of waste rare earth fluorescent powders by two steps acid leaching

Content Provider	Springer Nature Link
Author	Zhang, Shen Gen Yang, Min Liu, Hu Pan, De An Tian, Jian Jun
Copyright Year	2013
Abstract	The effects of the acid leaching and alkali fusion on the leaching efficiency of Y, Eu, Ce, and Tb from the waste rare earth fluorescent powders were investigated in this paper. The results show that hydrochloric acid is better than sulfuric acid in the first acid leaching, and NaOH is better than Na$_{2}$CO$_{3}$ in the alkali fusion. In the first acid leaching, the W $_{loss}$ is 20.94 % when the waste rare earth fluorescent powders are acid leached in H$^{+}$ concentration 3 mol·L$^{−1}$ and S/L ratio 1:3 for 4 h due to red powders dissolved. The better results of the alkali fusion can be got at 800 °C for 2 h when the NaOH is used. The blue powders and the green powders can be dissolved into NaAlO$_{2}$ and oxides such as rare earth oxide (REO). The REO can be dissolved in H$^{+}$ concentration 5 mol·L$^{−1}$, S/L 1:10 for 3 h in the second acid leaching. The leaching rates of the Y, Eu, Ce, and Tb are 99.06 %, 97.38 %, 98.22 %, and 98.15 %, respectively. The leaching rate of the total rare earth is 98.60 %.
Starting Page	609
Ending Page	615
Page Count	7
File Format	PDF
ISSN	10010521
Journal	Rare Metals
Volume Number	32
Issue Number	6
e-ISSN	18677185
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-12-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Waste rare earth fluorescent powders Two steps acid leaching Alkali fusion Metallic Materials Nanotechnology Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Inorganic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Physical and Theoretical Chemistry Condensed Matter Physics

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