Mineralogy Analysis of Rare Earth Tailings and Effect of Microwave Calcination on Their Catalytic Denitrification Performance
WANG Jian1, GONG Zhijun1,2, LI Baowei2, XU Guodong1, WU Wenfei1,2
1 School of Environment & Energy, Inner Mongolia University of Science & Technology, Baotou 014010, China; 2 Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Baotou 014010, China
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.
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2020, Vol. 34 
