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

引用

Journal of Rare Earths 2020年第10期38卷 1140-1150,I0005页

作者： Huihui Wang Mei Li Dongliang Zhang Kai Gao Jianfei Li zongxi weng Wei Xu Mining Research Institute Inner Mongolia University of Science&TechnologyBaotou 014010China Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources Ministry of EducationBaotou 014010China

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.

关键词： High grade concentrates High-temperature roasting Rare-earth phase Decomposed Mechanism

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