Development of selective separation method for thorium and rare earth elements from monazite liquor

  • E. H. Borai
  • I. M. Ahmed
  • A. M. Shahr El-Din
  • M. S. Abd El-Ghany
Article
  • 38 Downloads

Abstract

The present work succeeded to develop new optional procedures to enhance the separation process of thorium and REEs. Selective precipitation of thorium with pyrophosphate was successfully attained for the upscale level in which, complete and efficient thorium separation (99%) was achieved with relatively low co-precipitation of REEs (average 15%) and Fe(III) (2.6%). On the other hand, promising and costless method has been developed to optimize the selective precipitation of REEs by adjusting the ratio of the free acids H2SO4 to H3PO4 at 5:1. It could be obviously demonstrated that about 65.3% of LREEs could be precipitated with a minor amount of thorium 11.9%. Finally, this proposed method could be successfully applied for production of Th and REEs with relatively high yield and purity in addition to low-cost–benefit.

Keywords

Monazite REEs Thorium Pyrophosphate 

Notes

Acknowledgements

Authors are thankful to the Science and Technology Development Fund (STDF), Egypt, for the financial support, Grant No 5021. We would also like to acknowledge the Nuclear Materials Authority, Egypt for providing the required high-grade monazite.

References

  1. 1.
    Zhu Z, Pranolo Y, Cheng C (2015) Separation of uranium and thorium from rare earths for rare earth production: a review. Miner Eng. 77:185–196CrossRefGoogle Scholar
  2. 2.
    Zhang P (2014) Comprehensive recovery and sustainable development of phosphate resources. Procedia Eng. 83:37–51CrossRefGoogle Scholar
  3. 3.
    Gui D, Zheng T, Chen L, Wang Y, Li Y, Sheng D, Diwu J, Chai Z, Albrecht-Schmitt TE, Wang S (2016) Hydrolytically stable nanoporous thorium mixed phosphite and pyrophosphate framework generated from redox-active ionothermal reactions. Inorg Chem.  https://doi.org/10.1021/acs.inorgchem.6b00293 Google Scholar
  4. 4.
    Osman A (1998) Solvent extraction study on uranium and thorium from sulphuric acid solution and its technological applications, M.Sc. thesis, Zagazig UniversityGoogle Scholar
  5. 5.
    Horwitz EP, Dietz ML, Nelson DM, La Rosa JJ, Fairman WL (1990) Concentration and separation of actinides from urine using a supported organophosphorus extractant. Anal Chim Acta 238:263–271CrossRefGoogle Scholar
  6. 6.
    Spjuth L, Liljenzin JO, Hudson MJ, Drew MG, Iveson PB, Madic C (2000) Comparison of extraction behavior and basicity of some substituted malonamides. Sol Extr Ion Exch 18:1–23CrossRefGoogle Scholar
  7. 7.
    Yevstyukhin AI, Dunworth JV, Yemel’Yanov S (2013) The metallurgy of nuclear fuel: properties and principles of the technology. Elsevier, New YorkGoogle Scholar
  8. 8.
    Brisson VL, Zhuang WQ, Alvarez-Cohen L (2016) Bioleaching of rare earth elements from monazite sand. Biotechnol Bioeng 113:339–348CrossRefGoogle Scholar
  9. 9.
    Borai EH, Eid MA, Aly HF (2002) Determination of REEs distribution in monazite and xenotime minerals by ion chromatography and ICP-AES. Anal Bioanal Chem 372:537–541CrossRefGoogle Scholar
  10. 10.
    Borai EH, Abd El-Ghany MS, Ahmed IM, Hamed MM, Shahr El-Din AM, Aly HF (2016) Modified acidic leaching for selective separation of thorium, phosphate and rare earth concentrates from Egyptian crude monazite. Int J Miner Process 149:34–41CrossRefGoogle Scholar
  11. 11.
    Amaral JC, Morais CA (2010) Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction. Miner Eng 23:498–503CrossRefGoogle Scholar
  12. 12.
    Kul M, Topkaya Y, Karakaya I (2008) Rare earth double sulfates from preconcentrated bastnasite. Hydrometal 93:129–135CrossRefGoogle Scholar
  13. 13.
    Abreu RD, Morais K, Carlos A (2010) Purification of rare earth elements from monazite sulphuric acid leach liquor and the production of high-purity ceric oxide. Miner Eng 23:536–540CrossRefGoogle Scholar
  14. 14.
    Ahmed SH, Helaly OS, Abd El-Ghany MS (2015) Evaluation of rare earth double sulphate precipitation from monazite leach solutions. Int J Inorg Bioinorg Chem 5(1):1–8Google Scholar
  15. 15.
    Marzenko Z (1986) Spectrophotometric determination of elements. Wiley, New YorkGoogle Scholar
  16. 16.
    Borai EH, ElAfifi EM, Shahr El-Din AM (2017) Selective elimination of natural radionuclides during the processing of high grade monazite concentrates by caustic conversion method. Korean J Chem Eng 34(4):1091–1099CrossRefGoogle Scholar
  17. 17.
    Kim E, Osseo-Asare K (2012) Aqueous stability of thorium and rare earth metals in monazite hydrometallurgy: Eh–pH diagrams for the systems Th–, Ce–, La–, Nd– (PO4)–(SO4)–H2O at 25°C. Hydrometal 113–114:67–78CrossRefGoogle Scholar
  18. 18.
    Routa A, Binnemans K (2014) Liquid-liquid extraction of europium(III) and other trivalent rare-earth ions using a non-fluorinated functionalized ionic liquid. Dalton Trans 43:1862–1872CrossRefGoogle Scholar
  19. 19.
    Mahmoud MHH, Mohsen Q (2011) Enhanced solvent extraction of cadmium and iron from phosphoric acid in chloride media. Physicochem Probl Miner Process 47:27–40Google Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • E. H. Borai
    • 1
  • I. M. Ahmed
    • 1
  • A. M. Shahr El-Din
    • 1
  • M. S. Abd El-Ghany
    • 2
  1. 1.Hot Laboratory CenterAtomic Energy AuthorityCairoEgypt
  2. 2.Nuclear Materials AuthorityCairoEgypt

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