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Role of D2EHPA in Ion Flotation of Neodymium for Achieving a High Selectivity over Base Metal Impurities

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Abstract

Selective ion flotation of neodymium ions from aluminum, iron, and calcium ions using sodium dodecyl sulfate (SDS) as a surfactant and di-(2-ethylhexyl) phosphoric acid (D2EHPA) as an extractant was performed to selectively recover neodymium ions from solutions in a binary system of ions. The results indicated that the D2EHPA caused an increase in the neodymium ion recovery in the presence of all competing ions. Using D2EHPA, the calcium ion removal decreased and the removal of iron and aluminum ions increased. The Gibbs free energy of neodymium-D2EHPA complex formation was more than that of other ions, which led to an increase in the selective recovery of neodymium ions. The aluminum ions had a greater effect on decreasing the neodymium recovery than iron or calcium ions. Similar Gibbs free energy and complex structures of the neodymium and aluminum ions with D2EHPA led to the less selective separation of neodymium from aluminum.

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Authors and Affiliations

  1. Department of Mining, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran

    Mehdi Zakeri Khatir, Mahmoud Abdollahy & Mohammad Reza Khalesi

  2. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, 158754413, Iran

    Bahram Rezai

Authors
  1. Mehdi Zakeri Khatir
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  2. Mahmoud Abdollahy
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  3. Mohammad Reza Khalesi
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  4. Bahram Rezai
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Correspondence to Mahmoud Abdollahy.

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Khatir, M.Z., Abdollahy, M., Khalesi, M.R. et al. Role of D2EHPA in Ion Flotation of Neodymium for Achieving a High Selectivity over Base Metal Impurities. JOM 74, 240–248 (2022). https://doi.org/10.1007/s11837-021-05016-y

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  • DOI: https://doi.org/10.1007/s11837-021-05016-y

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