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

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Abstract

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 \(\overline {3[{\rm<Emphasis Type="Bold">MA</Emphasis>}] \cdot [{{\rm{H}}_3}{\rm{P}}{{\rm{O}}_4}]} \) complex in the organic phase. The thermodynamic properties determined at various temperatures indicated that the process was exothermic with a calculated enthalpy (ΔH⊖) 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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Acknowledgements

This work was supported by the Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant No. 2019H1D3A2A02101993). The author Sadia Ilyas is grateful to NRF for presenting the Brain Pool Scientists award.

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Authors and Affiliations

  1. Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea

    Sadia Ilyas & Hyunjung Kim

  2. Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam

    Rajiv Ranjan Srivastava

  3. Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Vietnam

    Rajiv Ranjan Srivastava

Authors
  1. Sadia Ilyas
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  2. Rajiv Ranjan Srivastava
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  3. Hyunjung Kim
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Correspondence to Hyunjung Kim.

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Ilyas, S., Srivastava, R.R. & Kim, H. Liquid-liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine. Int J Miner Metall Mater 28, 367–372 (2021). https://doi.org/10.1007/s12613-020-2151-8

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  • DOI: https://doi.org/10.1007/s12613-020-2151-8

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