NDLI: Reaction behavior of associated rare earth minerals during coal-based reduction

Content Provider	Springer Nature Link
Author	Gao, Peng Li, Zhi Hang Han, Yue Xin Sun, Yong Sheng
Copyright Year	2014
Abstract	In order to ascertain the reaction behavior of rare earth minerals in coal-based reduction, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses were applied to investigate the rare earth minerals in Bayan Obo. The occurrence state and regularity of rare earth elements were analyzed under different reduction time. The results reveal that rare earth elements in rare earth minerals exist in RE(CO$_{3}$)F (bastnaesite) and REPO$_{4}$ (monazite). In this research, at 1,498 K with a C/O molar ratio (i.e., molar ratio of fixed carbon in the coal to reducible oxygen in the ore) of 2.5, rare earth minerals primarily decompose into RE$_{2}$O$_{3}$ at 5 min. When the time is extended to 10 min, solid-phase reactions occur among RE$_{2}$O$_{3}$, CaO, and SiO$_{2}$, and the resultant is cerium wollastonite (CaO·2RE$_{2}$O$_{3}$·3SiO$_{2}$). At reaction time >20 min, rare earth elements mainly exist in cerium wollastonite (CaO·2RE$_{2}$O$_{3}$·3SiO$_{2}$), and the grain size varies in the range of 10–30 μm. The results show that coal-based reduction is efficient to recover rare earth minerals in reduced materials.
Starting Page	628
Ending Page	632
Page Count	5
File Format	PDF
ISSN	10010521
Journal	Rare Metals
Volume Number	33
Issue Number	5
e-ISSN	18677185
Language	English
Publisher	Nonferrous Metals Society of China
Publisher Date	2014-09-16
Publisher Place	Springer Berlin Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coal-based reduction Rare earth minerals Reaction behavior 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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