稀土尾矿矿物学分析及微波焙烧对其催化脱硝性能的影响

doi:10.11896/cldb.19080103

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Abstract The characteristics of chemical composition, mineral composition and mineral embedding of rare earth tailings were studied by X-ray fluorescence spectrometer (XRF), X-ray diffractometer (XRD), scanning electron microscopy (SEM), advanced mineral identification and cha-racterization system (AMICS), thermogravimetric analyzer (TG) and mass spectrometer (MS). The results showed that the rare earth tailings have a complex mineral composition and a fine grain size. Iron mainly occured in hematite, magnetite and pyrite, and rare earth elements mainly occured in bastnasite and monazite. Rare earth tailings were calcined by five microwave calcination temperatures of 300 ℃, 350 ℃, 400 ℃, 450 ℃ and 500 ℃. The experimental results showed that the rare earth tailings at 400 ℃ calcination had the highest catalytic denitrification rate. When the reaction temperature was 900 ℃, the denitrification rate can reach to 96.1%. Rare earth tailings of 400 ℃ calcination were characterized as follows: XRD showed that two Fe₂O₃ characteristic peaks disappeared at 400 ℃ calcination; SEM showed some cracks and pores on the mineral surface, and the mineral surface had different degrees of collapse; temperature programmed reduction (H₂-TPR) showed that the range of mineral reduction temperature was broadened at 400 ℃ calcination, and the temperature of the reduction peak advanced. The results may provide the evidence for the efficient and comprehensive utilization of the rare earth tailing from Bayan Obo.

Key words： rare earth tailings mineralogy analysis microwave catalytic

Published: 24 July 2020

CLC number:

TD983

Fund:This work was financially supported by the National Natural Science Foundation of China (51866013), Natural Science Foundation of Inner Mongolia Autonomous Region (2017MS(LH)0529).

About author:: Jian Wangreceived his bachelor’s degree in enginee-ring from Inner Mongolia University of Science and Technology in 2017. He is currently a graduate student at Inner Mongolia University of Science and Technology. His research has focused on mineral catalytic materials.
Wenfei Wuworks for Inner Mongolia University of Science and Technology, master tutor, professor. His research interests are thermal engineering test and numerical simulation research, efficient clean combustion technology.

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	WANG Jian
	GONG Zhijun
	LI Baowei
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Cite this article:

WANG Jian,GONG Zhijun,LI Baowei, et al. Mineralogy Analysis of Rare Earth Tailings and Effect of Microwave Calcination on Their Catalytic Denitrification Performance[J]. Materials Reports, 2020, 34(16): 16072-16076.

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http://www.mater-rep.com/EN/10.11896/cldb.19080103 OR http://www.mater-rep.com/EN/Y2020/V34/I16/16072

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