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Study of the Mechanochemical Calcification for Mixed Rare Earth Concentrate

  • Jiang LiuEmail author
  • Ting-an Zhang
  • Zhihe Dou
  • Yukun Huang
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The paper aimed to propose that mixed rare earth concentrate was decomposed by pressurized calcification where mechanical milling was applied simultaneously (also known as mechanochemical calcification). The bastnaesite and monazite were both decomposed by OH, where released rare earth formed RE(OH)3, released fluorine and phosphorus formed CaF2 and Ca2P2O7. Then, the calcified slag was leached by diluted hydrochloric acid to extract rare earth and both recover fluorine and phosphorus. The phase transformation regularity, the behavioral trends of rare earth, fluorine and phosphorus were investigated. Results showed under the optimal conditions of ball to material weight 80:1, the calcification temperature 250 °C, the liquid-solid ratio 5:1, the leaching yield of rare earth reached to 92.16%, Ce was 86.47%, La was 97.58%, Nd was 99.99% and the mass fraction of F, P entering into calcified liquor were 8.27, 0.21% respectively. The micromorphology of the mineral has a transition from dense to fluffy, and then became dense again.

Keywords

Mixed concentrate Calcification transformation Acid leaching Mechanical milling 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support received from the National Basic Research Program of China (973 program, No. 2012CBA01205) and the basic research universities special fund operations (N162505002).

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Jiang Liu
    • 1
    Email author
  • Ting-an Zhang
    • 1
  • Zhihe Dou
    • 1
  • Yukun Huang
    • 1
  1. 1.Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education, School of MetallurgyNortheastern UniversityShenyangChina

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