Beneficiation and Leaching Study of Norra Kärr Eudialyte Mineral

  • Victoria VaccarezzaEmail author
  • Corby Anderson
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Due to the demand for rare earth elements for everyday technology and applications, there has been much research initiation into the extraction and recovery of rare earth elements. An otherwise unknown mineral, eudialyte is a zircon silicate consisting of rare earth oxides, specifically the heavy REO yttrium (III), with only trace amounts of thorium and uranium. The first part of this project aimed at finding an efficient way to liberate and upgrade eudialyte to concentrate the REO content. A combination of gravity and magnetic separation techniques were employed, resulting in limited success. The second part looked at the hydrometallurgical processing of eudialyte through various leaching experiments with sulfuric acid. In all, this project will discuss why certain processes were utilized over others, as well as the difficulties that arose during processing.


Eudialyte Rare earth elements Beneficiation Leaching Gravity separation Magnetic separation 


  1. 1.
    Gupta C, Krishnamurthy N (2016) Extractive metallurgy of rare earths. CRC Press, Boca Raton, FLGoogle Scholar
  2. 2.
    Fischetti M Global demand stresses limited supply. Sci Am 305(4):64–65, Academic Search Premier, EBSCOhost Google Scholar
  3. 3.
    Rare Earth Consumption is Growing (2003) Power Electronics Technology, General Reference Center GOLD.
  4. 4.
    Zakharova I, Nayfonov T (1974) A study on floatability of eudialyte and associated minerals. Russ J Nonferrous Met 1:12–16 (in Russian)Google Scholar
  5. 5.
    Ferron CJ, Bulatovic SM, Salter RS (1991) Beneficiation of rare earth oxide minerals. Mater Sci Forum 70–72:251–270CrossRefGoogle Scholar
  6. 6.
    Naiphonov TB, Beloborodov VI, Zaharova IB, Kulakov AN, Zorina TA (1991) Flotation technology for beneficiation of eudialyte ore. In: XVII international mineral processing congress, Dresden, vol 4, pp. 131–138Google Scholar
  7. 7.
    Stark T, Silin I, Wortuba H (2017) Mineral processing of eudialyte ore from Norra Kärr. J Sustain Metall 3:32–38CrossRefGoogle Scholar
  8. 8.
    Forrester K, Reveley S, Short M, Saxon M, Holmström H, Leijd M (2015) Norra Kärr Project Development. In: Proceeding of Alta Uranium-REE Sessions, Perth, AustraliaGoogle Scholar
  9. 9.
    Forrester et al. K Beneficiation of rare earth element enriched eudialyte from the Norra Kärr peralkaline intrusion with wet high intensity magnetic separation. In: Conference of metallurgists, Canadian Institute of Mining, Metallurgy and Petroleum, VancouverGoogle Scholar
  10. 10.
    Tasman Metals, Ltd. (2015) Prefeasibility Study-NI 43-101-Technical report for the Norra Kärr Rare Earth Element DepositGoogle Scholar
  11. 11.
    ENP Newswire (2014) Tasman precipitates heavy rare earth element concentrate and provides flowsheet development update for Norra Kärr project, Sweden. COMTEX News Network, Inc.Google Scholar
  12. 12.
    mindat.orgGoogle Scholar
  13. 13.
    Davris P, Stopic S, Balomenos E, Panias D, Paspaliaris I, Friedrich B (2016) Leaching of rare earth elements from eudialyte concentrate by suppressing silica gel formation. Mineral EngGoogle Scholar
  14. 14.
    Iler RK (1979) The chemistry of silica: solubility, polymerization, colloid and surface properties, and biochemistry. WileyGoogle Scholar
  15. 15.
    Encyclopedia of Chemical Technology, 4th edn, vol 21. Wiley, New York, pp 983–984; 993–995 (1991)Google Scholar
  16. 16.
    Voßenkaul D, Birich A, Müller N, Stoltz N, Friedrich B (2016) Hydrometallurgical processing of eudialyte bearing concentrates to recover rare earth elements via low-temperature dry digestion to prevent the silica gel formation. J Sustain MetallGoogle Scholar
  17. 17.
    Sjöqvist ASL, Cornell DH, Andersen T, Erambert M, Ek M, Leijd M (2013) Three compositional varieties of rare-earth element ore: eudialyte-group minerals from the Norra Kärr Alkaline Complex, Southern Sweden. Minerals 3:94–120CrossRefGoogle Scholar
  18. 18.
    Wyss G (2016) Characterization of eudialyte process samples. Center for advanced mineral and metallurgical processing (CAMP). Montana Tech of the University of MontanaGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials Engineering, Kroll Institute for Extractive MetallurgyColorado School of MinesGoldenUSA

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