Element migration and phase distribution characteristics during crystallization of rare earth phase in rare earth slag |
| |
| Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China;1. National Engineering Research Center for Rare Earth, GRINM Group Co., Ltd., Beijing 100088, China;2. GRIREM Advanced Materials Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;4. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China;2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;1. Insititute of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China;2. National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, China;1. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. State Key Laboratory of Precision Blasting and Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China;3. National Engineering Laboratory for VOCs Pollution Control Material & Technology, University of Chinese Academy of Sciences, Beijing 101408, China |
| |
| Abstract: | The crystallization experiment of molten rare earth (RE) slag under different cooling rates was carried out. The characteristics of element migration and phase distribution during RE phase crystallization were studied by using different equipment. The experimental results show that there are two RE phases in the RE slag, namely (Ca, Ce, La)5(SiO4)6F and (Ca,Ce,La,Mg)3(Ti,Al,Nb)2O7. During the cooling crystallization process of molten RE slag, Ca and P elements in the RE phase of (Ca,Ce,La)5(SiO4)6F migrate from inside to outside, and finally gather at the outer edge of the phase to form phase Ca3(PO4)2. The RE phase (Ca,Ce,La)5(SiO4)6F is distributed inside the furnace-cooled slag, and the RE phase (Ca,Ce,La,Mg)3(Ti,Al,Nb)2O7 is distributed in the surface layer of the furnace-cooled slag. And based on the phase distribution characteristics, the central hollowing method is proposed to realize the preliminary enrichment of valuable elements Ti, Nb and RE in RE slag. |
| |
| Keywords: | Rare earth slag Element migration Phase distribution Element enrichment |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
