Sadia Ilyas, Rajiv Ranjan Srivastava, and Hyunjung Kim, Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 367-372. https://doi.org/10.1007/s12613-020-2151-8
Cite this article as:
Sadia Ilyas, Rajiv Ranjan Srivastava, and Hyunjung Kim, Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 367-372. https://doi.org/10.1007/s12613-020-2151-8
Research Article

Liquid–liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine

+ Author Affiliations
  • Corresponding author:

    Hyunjung Kim    E-mail: kshjkim@jbnu.ac.kr

  • Received: 18 May 2020Revised: 5 July 2020Accepted: 21 July 2020Available online: 24 July 2020
  • This study addresses the liquid–liquid extraction behavior of phosphorus from a sulfuric acid solution using benzyl dimethyl amine (BDMA) in kerosene. The extraction equilibria investigated with varied BDMA concentrations could reveal the formation of

    \begin{document}$\overline {3\left[ {{\rm{BDMA}}} \right] \cdot \left[ {{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}} \right]} $\end{document}

    complex in the organic phase. The thermodynamic properties determined at various temperatures indicated that the process was exothermic with a calculated enthalpy (

    $\Delta {H^ \ominus }$

    ) of −24.0 kJ·mol−1. The organic-to-aqueous phase (O/A) volume ratio was varied to elucidate the quantitative extraction of phosphorus. The McCabe–Thiele diagram plotted for the extraction isotherm was validated for the requirement of three counter-current stages in the extraction at an O/A volume ratio of 2.0/3.5. The back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol·L−1 H2SO4 solution in three stages of counter-current contact at an O/A volume ratio of 3/2. This study can be applied to remove phosphorus from the sulfuric acid leach solutions of monazite processing, and many other solutions.

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