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Solvent Extraction Separation of La, Sm and Dy from Sulfate-Phosphate Medium by CYANEX 272 in Kerosene

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Abstract

Extraction and separation of La, Sm and Dy ions from acidic sulfate-phosphate solutions was investigated using a cation exchange extractant, bis(2,4,4-trimethylpentyl) phosphinic acid, CYANEX 272, in kerosene. The influence of shaking time, equilibrium pH, extractant, sulfate and phosphate ion concentrations, diluent type and temperature was studied. The extraction was found to be pH-dependent, and increasing the phosphate ion concentration inhibited the extraction which was found to be endothermic. The stoichiometry of the extracted metal species was found to be MOH.H2OHSO4H2A.A2. Aliphatic diluents were found to enhance the extraction compared to aromatic diluents. The results showed that there was a separation mode between the metal ions when varying the hydrogen ion and sulfate ion concentrations, under the used experimental conditions. The investigated process was used for the recovery of La, Sm and Dy from the acid solution resulting from the leaching of low-grade monazite.

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Acknowledgements

The authors would like to thank Prof. H.F. Aly for his helpful advice and comments and Prof. J.A. Daoud for reviewing the manuscript.

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Authors and Affiliations

  1. Chemistry Department, College of Science, Jouf University, Skaka, Saudi Arabia

    I. M. Ahmed

  2. Hot Laboratories and Waste Management Center, Atomic Energy Authority, Cairo, 13759, Egypt

    I. M. Ahmed, R. S. Hassan & M. I. Aly

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  1. I. M. Ahmed
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  2. R. S. Hassan
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  3. M. I. Aly
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Correspondence to I. M. Ahmed.

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Ahmed, I.M., Hassan, R.S. & Aly, M.I. Solvent Extraction Separation of La, Sm and Dy from Sulfate-Phosphate Medium by CYANEX 272 in Kerosene. Mining, Metallurgy & Exploration 37, 475–480 (2020). https://doi.org/10.1007/s42461-020-00178-w

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