Article metrics

  • citations in SCindeks: [2]
  • citations in CrossRef:0
  • citations in Google Scholar:[=>]
  • visits in previous 30 days:2
  • full-text downloads in 30 days:2
article: 4 from 7  
Back back to result list
Vojnotehnički glasnik
2018, vol. 66, iss. 4, pp. 757-770
article language: English
document type: Original Paper
published on: 12/09/2018
doi: 10.5937/vojtehg66-17177
Creative Commons License 4.0
Leaching of rare earth elements with sulfuric acid from bastnasite ores
RWTH Aachen University, IME Process Metallurgy and Metal Recycling, Aachen, Federal Republic of Germany

e-mail: sstopic@ime-aachen.de, bfriedrich@ime-aachen.de

Project

The research leading to these results has received funding from the European Communitys Seventh Framework Programme (Call identifier FP7-NMP-2012-LARGE-6) under grant agreement n°309373

Abstract

Dissolution of rare earth elements from bastnasite ores was studied using sulfuric acid at the atmospheric pressure. The one step strategy with sulfuric acid was studied further and the results showed that filtering difficulties do not happen for the chosen parameter combinations. Furthermore, the best parameter combinations were those with low temperatures and low acid concentrations. All in all, direct leaching is a simple process that uses the cheapest acid on the market and offers good leaching recoveries. Attention should be given to the formation of gel, especially when taking the process to the large scale, and the subsequent elimination of Ca from the leachate.

Keywords

References

*** (2011) Rare earth elements: British geological survey. Natural environment research council, Center for sustainable mineral development, November 24th 2013, https://www.bgs.ac.uk/downloads/start.cfm?id=1638
Balomenos, E., Davris, P., Deady, E., Yang, J., Panias, D., Friedrich, B., Binnemans, K., Seisenbaeva, G., Dittrich, C., Kalvig, P., Paspaliaris, I. (2017) The EURARE project: Development of a sustainable exploitation scheme for Europe's rare earth ore deposits. Johnson Matthey Technology Review, 61(2), pp.142-153. Available at: https://doi.org/10.1595/205651317x695172
Castor, B., James, B., Hedrick, B. (2006) Rare earth elements. in: Kogel J.E., Trivedi N.C., Barker J.M. [ed.] Industrial Minerals and Rocks, pp. 769-792
Chen, Z. (2011) Global rare earth resources and scenarios of future rare earth industry. Journal of Rare Earths, 29(1), pp.1-6, https://doi.org/10.1016/s1002-0721(10)60401-2
Davris, P., Stopic, S., Balomenos, E., Panias, D., Paspaliaris, I., Friedrich, B. (2017) Leaching of rare earth elements from eudialyte concentrate by suppressing silica gel formation. Minerals Engineering, 108, pp.115-122. Available at: https://doi.org/10.1016/j.mineng.2016.12.011
Feng, X., Long, Z., Cui, D., Wang, L., Huang, X., Zhang, G. (2013) Kinetics of rare earth leaching from roasted ore of bastnaesite with sulfuric acid. Transactions of Nonferrous Metals Society of China, 23(3), pp.849-854. Available at: https://doi.org/10.1016/s1003-6326(13)62538-8
Gupta, C.K., Krishnamurthy, N. (2005) Extractive Metallurgy of Rare Earths. Abingdon, UK: Informa UK Limited
Hoshino, M., Sanematsu, K., Watanabe, Y. (2016) REE mineralogy and resources. in: Handbook on the physics and chemistry of rare earths, Elsevier BV, pp.129-291, https://doi.org/10.1016/bs.hpcre.2016.03.006
Khaw, J.F.C., Lim, B.S., Lim, L.E.N. (1995) Optimal design of neural networks using the Taguchi method. Neurocomputing, 7(3): 225-245
Ma, Y., Stopic, S., Gronen, L., Milivojevic, M., Obradovic, S., Friedrich, B. (2018) Neural network modeling for the extraction of rare earth elements from eudialyte concentrate by dry digestion and leaching. Metals, 8(4), p.267. Available at: https://doi.org/10.3390/met8040267