Phase change,micro-structure and reaction mechanism during high temperature roasting of high grade rare earth concentrate

作     者：Huihui Wang Mei Li Dongliang Zhang Kai Gao Jianfei Li Zongxi Weng Wei Xu Huihui Wang;Mei Li;Dongliang Zhang;Kai Gao;Jianfei Li;Zongxi Weng;Wei Xu

作者机构：Mining Research InstituteInner Mongolia University of Science&TechnologyBaotou 014010China Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth ResourcesMinistry of EducationBaotou 014010China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2020年第38卷第10期

页      面：1140-1150,I0005页

核心收录：

学科分类：080603[工学-有色金属冶金] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0806[工学-冶金工程] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：Project supported by the key program of the National Natural Science Foundation of China (51634005 51564042) Inner Mongolia Autonomous Region Natural Science Foundation (2014ZD04 2016ZD05) 

主　　题：High grade concentrates High-temperature roasting Rare-earth phase Decomposed Mechanism 

摘      要：The deposit of Bayan Obo in Inner Mongolia is the world’s largest rare earth element(abbreviated as REE)*** exploration of the theory of mineral formation of Bayan Obo is an important foundation for mineralogical research,and is the scientific basis for mining,industrial beneficiation,smelting and extraction,and processing and *** the rapid development of science and technology,the demand for the utilization of rare earth elements is increasing,and the separation process between rare earth elements needs to be *** purpose of this paper is to provide high temperature experimental information for the formation and application of rare earth *** this end,the mineral evolution of high-grade rare earth concentrates with increasing temperature and the migration of rare earths at different stages and their reaction mechanisms were *** to thermogravimetric analysis and differential scanning calorimetry(TG-DSC),calcination was carried out at different temperature ranges,and the calcined products were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron micro scope and energy dispers ive spectrometer(SEM-EDS)and other analytical *** re sults are shown in this process,the ra re earth phase is first converted into rare earth oxide and rare earth *** the temperature increases,Ca5(PO4)3 F and a large number of self-shaped spherical Ca-RE-OF and Ca-RE-PO4 particles are formed,and the separation of La and Ce elements is *** rding to the phase diagram analysis,the production of Ca5(PO4)3 F is due to the reaction of monazite and fluorite,and the phases CeF2 and Ce F3 are formed during the *** it reaches 1500℃,barium ferrite is produced and a new substance containing Ba2+is formed.