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Study of Cadmium Extraction with Aliquat 336 from Highly Saline Solutions

  • Hans Vigeland Lerum
  • Niels Højmark Andersen
  • Dag Øistein Eriksen
  • Eddy Walther Hansen
  • Dirk Petersen
  • Grethe Wibetoe
  • Jon Petter Omtvedt
Article
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Abstract

A large number of model solutions with high ionic strength were synthesised to mimic industrial conditions and were used as a first approach to study Cd extraction in the presence of chloride at high salinity, as experienced in real industrial solutions. The extractant used throughout in this work was Aliquat 336, a quaternary ammonium salt well known to the hydrometallurgical industry. The effects of some selected anions in addition to chloride (i.e., perchlorate, nitrate, and sulfate) were studied. The distribution of cadmium was measured using 109Cd as a tracer. Liquid-scintillation spectroscopy quantified the concentration of 109Cd in both phases. Raman and NMR spectroscopy were employed to gain further insight into the extraction chemistry. A careful analysis of all Cd extraction data showed that within specific windows of the reactant concentrations the chemical reactions could be represented by simplified equations, as discussed thoroughly in the text. Equilibrium constants for the extraction of \({\text{CdCl}}_{3}^{ - }\) from chloride and chloride/sulfate media were determined to be log10Kext = 4.9 ± 0.8 and log10Kext = 5.7 ± 0.5, respectively. For the nitrate environment, an exchange reaction involving a LiNO3 ion pair is proposed and agrees with the experimental data, but was not proven. 14N-NMR and Raman spectroscopy confirmed that the relative affinity of Aliquat 336 for the relevant anions followed the order: perchlorate > nitrate > chloride > sulfate. Finally, 14N-NMR enabled the equilibrium constant of the exchange reaction between nitrate and chloride for Aliquat 336 to be determined.

Keywords

Liquid–liquid extraction NMR Raman spectroscopy Cadmium High salinity Radiotracers 

Notes

Acknowledgements

The authors are grateful for the financial support from the Norwegian Research Council and industry companies Yara International, Glencore Nikkelverk, and Boliden Odda. The support was channelled through the Norwegian Research Council project BIA-KPN, Project No. 2366741. We also appreciate the valuable input and constructive discussions with representatives from our industry partners. Thanks to the University of Oslo NMR laboratory for running the NMR experiments.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Hans Vigeland Lerum
    • 1
  • Niels Højmark Andersen
    • 1
  • Dag Øistein Eriksen
    • 1
  • Eddy Walther Hansen
    • 1
  • Dirk Petersen
    • 1
  • Grethe Wibetoe
    • 1
  • Jon Petter Omtvedt
    • 1
  1. 1.Department of ChemistryUniversity of OsloOsloNorway

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