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Effect of Chemical Composition on the Crystallization Behaviour of Rare Earth Phase in Slag

  • Tengfei Ma
  • Fu Feng
  • Xuefeng SheEmail author
  • Jingsong Wang
  • Qingguo Xue
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

In order to figure out the effect of chemical composition on the crystallization behaviour of rare earth phase in rare earth slag, the quaternary system SiO2–CaO–CaF2–Ce2O3 slags were made by pure chemical reagent at 1673 K in muffle furnace. The mineral phases and micromorphology of slags were detected by the X-ray diffraction and scanning electron microscope (SEM), respectively. The results show that grains of RE-containing mineral grow very well and the equivalent diameter of grains is about 100 μm when the basicity is about 1. The effect of CaF2 on the crystallization of the rare earth phase is complex. With the increase of basicity, the crystallization of the rare earth phase is increasing and the RE-concentrating phase exists in a rod-like structure. But when the alkalinity is up to 2.0, the distribution of RE-concentrating phase becomes dispersive and the crystals of rare earth phase have no definite shape. The major minerals are fluorite, cuspidine, RE-concentrating phase and substrate phase.

Keywords

Rare earth slag SiO2–CaO–CaF2–Ce2O3 Crystallization behaviour 

Notes

Acknowledgements

The authors gratefully acknowledge the support of National Natural Science Foundation of China (No. 51874029) and the project of State Key Laboratory of Advanced Metallurgy (No. 41618018).

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Tengfei Ma
    • 1
  • Fu Feng
    • 1
  • Xuefeng She
    • 1
    Email author
  • Jingsong Wang
    • 1
  • Qingguo Xue
    • 1
  1. 1.State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijingChina

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