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Journal of Sustainable Metallurgy

, Volume 3, Issue 1, pp 79–89 | Cite as

Hydrometallurgical Processing of Eudialyte Bearing Concentrates to Recover Rare Earth Elements Via Low-Temperature Dry Digestion to Prevent the Silica Gel Formation

  • D. VoßenkaulEmail author
  • A. Birich
  • N. Müller
  • N. Stoltz
  • B. Friedrich
Thematic Section: Green Rare Earth Elements--Innovations in Ore Processing, Hydrometallurgy, and Electrolysis

Abstract

Eudialyte belongs to the group of cyclosilicate minerals and has a significant content of valuable heavy rare earth elements. In comparison to conventional ores like bastnaesite or monazite, the content of radioactive elements like thorium and uranium is quite low; thus, it is an ideal source for the sustainable extraction of rare earth elements (REE). In this way, a further processing or a disposal, direct or after using phase, of radioactive elements could be minimized. The cyclosilicate structure facilitates the easy decomposition of eudialyte by mineral acids. On one hand, this is a positive effect to lixiviate the REEs but leads to an excess liberation of silicon in the water-based system which involves the risk of silica gel formation. Within this research project, a hydrometallurgical pre-treatment is developed to decompose the eudialyte for the extraction of REEs and to stabilize the silicon in the residue during the following leaching step.

Keywords

Eudialyte Rare earth element Silica gel Dry digestion Aging Fuming Leaching Hydrometallurgy 

Notes

Acknowledgments

This research is part of the Siemens AG collaborative research center S-FB “Green Mining and Separation” at the Aachen University. We thank the organizers of the 11th International Rare Earths Conference in Singapore for the possibility of an advanced presentation of these research findings.

References

  1. 1.
    Gambogi J (2016) Mineral Commodity Summaries 2016: Rare Earth, USGS National Minerals Information Center. http://minerals.usgs.gov/minerals/pubs/commodity/rare_earths/mcs-2016-raree.pdf. Accessed 11 Feb 2016
  2. 2.
    Lucas J (2014) Rare earths: science, technology, production and use. Elsevier, AmsterdamGoogle Scholar
  3. 3.
    Kingsnorth D (2015) The global rare earths industry today—plagued by illegal production in China. In: 11th international rare earths conference, SingaporeGoogle Scholar
  4. 4.
    Zhang J (2016) Separation hydrometallurgy of rare earth elements. SpringerGoogle Scholar
  5. 5.
    Yang XJ, Lin A, Li X et al (2013) China’s ion-adsorption rare earth resources, mining consequences and preservation. Environ Dev 8:131–136. doi: 10.1016/j.envdev.2013.03.006 CrossRefGoogle Scholar
  6. 6.
    Ministry of Environmental Protection (2011) Emission Standards of Pollutants from Rare Earth Industry. http://english.mep.gov.cn/standards_reports/standards/water_environment/Discharge_standard/201111/W020110210366768105784.pdf. Accessed 22 Mar 2016
  7. 7.
    Binnemans K, Jones PT (2015) Rare earths and the balance problem. J Sustain Metall 1(1):29–38. doi: 10.1007/s40831-014-0005-1 CrossRefGoogle Scholar
  8. 8.
    Chakhmouradian AR, Wall F (2012) Rare earth elements: minerals, mines, magnets (and more). Elements 8(5):333–340. doi: 10.2113/gselements.8.5.333 CrossRefGoogle Scholar
  9. 9.
    Goodenough KM, Schilling J, Jonsson E et al (2016) Europe’s rare earth element resource potential: an overview of REE metallogenetic provinces and their geodynamic setting. Ore Geol Rev 72:838–856. doi: 10.1016/j.oregeorev.2015.09.019 CrossRefGoogle Scholar
  10. 10.
    Giuseppetti G, Mazzi F, Tadini C (1971) The crystal structure of eudialyte. Tschermaks mineralogische und petrographische Mitteilungen 16:105–127CrossRefGoogle Scholar
  11. 11.
    Johnsen O et al (2003) The nomenclature of eudialyte-groupe minerals. Can Miner 41:785–794CrossRefGoogle Scholar
  12. 12.
    Ralph K, Ralph J Eudialyte. http://www.mindat.org/min-1420.html. Accessed 24 Nov 2015
  13. 13.
    Jordens A, Cheng YP, Waters KE (2013) A review of the beneficiation of rare earth element bearing minerals. Miner Eng 41:97–114. doi: 10.1016/j.mineng.2012.10.017 CrossRefGoogle Scholar
  14. 14.
    Stoltz N, Friedrichs P (2015) Eudialyte as an alternative resource: mineralogy, occurrence and availability. Final report—S-FB rare earth green mining and separation. RWTH Aachen University, FZ Jülich, pp 11–15 (unpublished)Google Scholar
  15. 15.
    Schilling J, Wu F, McCammon C et al (2011) The compositional variability of eudialyte-group minerals. Miner Mag 75(1):87–115. doi: 10.1180/minmag.2011.075.1.87 CrossRefGoogle Scholar
  16. 16.
    European Commission (2014) Report on critical raw materials for the EU: Report of the Ad hoc Working Group on defining critical raw materials. http://ec.europa.eu/enterprise/policies/raw-materials/files/docs/crm-report-on-critical-raw-materials_en.pdf. Accessed 22 May 2015
  17. 17.
    Merriman D. The European REE market and its place in the global industry. In: European Rare Earth Resources (ed) ERES 2014—1st International Conference on European Rare Earth Resources: Program and Book of AbstractsGoogle Scholar
  18. 18.
    Zaitsev V, Kogarko L Sources and perspectives of REE in the Lovozero massif (Kola Peninsula, Russia)Google Scholar
  19. 19.
    unbekannt 200. Stud., den 16. December 1819. In: unbekannt (ed) Göttingische gelehrte Anzeigen—Der dritte Band: Der königl. Gesellschaft der Wissenschaft, pp 1993–2000Google Scholar
  20. 20.
    Zakharov VI, Maiorov DV, Alishkin AR et al (2011) Causes of insufficient recovery of zirconium during acidic processing of lovozero eudialyte concentrate. Russ J Non-Ferr Met 52(5):423–428. doi: 10.3103/S1067821211050129 CrossRefGoogle Scholar
  21. 21.
    Lebedev V, Shchur T, Maiorov D et al (2003) Specific features of acid decomposition of eudialyte and certain rare-metal concentrates from Kola Peninsula. Russ J Appl Chem 76(8):1191–1196CrossRefGoogle Scholar
  22. 22.
    Lebedev V (2003) Sulfuric acid technology for processing of eudialyte concentrate. Russ J Appl Chem 76(10):1559–1563CrossRefGoogle Scholar
  23. 23.
    Motov DL, Leshtaeva TG (1966) Chemical technology of rare-earth raw materials. Nauka, Moscow, pp 5–16 (in Russian)Google Scholar
  24. 24.
    Irwin AL (2013) Dubbo Zirconia Project: environmental impact statement. http://majorprojects.planning.nsw.gov.au/index.pl?action=view_job&job_id=5251%20. Accessed 14 Mar 2016
  25. 25.
    Verbaan N, Bradley K, Brown J et al (2015) A review of hydrometallurgical flowsheets considered in current REE projects. Symposium on critical and strategic materials proceedings. Ministry of Energy and Mines, British Columbia Geological Survey. http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/Papers/Documents/P2015-3/18%20Verbaan.pdf
  26. 26.
    Iler RK (1979) The chemistry of silica: solubility, polymerization, colloid and surface properties, and biochemistry. Wiley, New YorkGoogle Scholar
  27. 27.
    Kokhanenko P, Brown K, Jermy M (2016) Silica aquasols of incipient instability: synthesis, growth kinetics and long term stability. Colloids Surf A 493:18–31. doi: 10.1016/j.colsurfa.2015.10.026 CrossRefGoogle Scholar
  28. 28.
    Bergna HE (1994) The colloid chemistry of silica: developed from a symposium sponsored by the Division of Colloid and Surface Chemistry, at the 200th National Meeting of the American Chemical Society, Washington, DC, August 26–31, 1990. Washington, DC, pp 1–47Google Scholar
  29. 29.
    Forrester K, Krebs D, Voßenkaul D (2015) Informal meeting between GBM Minerals Engineering Consultants, Greenland Minerals and IME Process Metallurgy and Metal Recycling, RWTH Aachen UniversityGoogle Scholar
  30. 30.
    Voßenkaul D (2016) Entwicklung eines Aufschlussverfahrens zur Gewinnung seltener Erdelemente aus Eudialyt (Development of a decomposition process of eudialyte to recover rare earth elements). Dissertation, Schriftenreihe des IME, RWTH, Shaker Verlag. http://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=6&category=280
  31. 31.
    Voßenkaul D, Friedrich B, Kruse S et al (2016) Method for opening a eudialyte mineral (DE102014218346A1)Google Scholar
  32. 32.
    Voßenkaul D, Friedrich B, Kruse S et al (2016) Method for opening a eudialyte mineral (EP2995692A1)Google Scholar
  33. 33.
    Pirrie D, Butcher AR, Power MR et al (2004) Rapid quantitative mineral and phase analysis using automated scanning electron microscopy (QemSCAN); potential applications in forensic geoscience. Geol Soc Lond Spec Publ 232(1):123–136. doi: 10.1144/GSL.SP.2004.232.01.12 CrossRefGoogle Scholar
  34. 34.
    Krishnamurthy N, Gupta CK (2016) Extractive metallurgy of rare earths, 2nd edn. CRC Press, Taylor & Francis Group, Boca RatonGoogle Scholar
  35. 35.
    Gorrepati EA, Wongthahan P, Raha S et al (2010) Silica precipitation in acidic solutions: mechanism, pH effect, and salt effect. Langmuir 26(13):10467–10474. doi: 10.1021/la904685x CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society (TMS) 2016

Authors and Affiliations

  1. 1.Institute of Process Metallurgy and Metal Recycling (IME)RWTH Aachen UniversityAachenGermany
  2. 2.Institute of Mineralogy and Economic Geology (IML)RWTH Aachen UniversityAachenGermany

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