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Separation of iron(iii), zinc(ii) and lead(ii) from a choline chloride–ethylene glycol deep eutectic solvent by solvent extraction

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posted on 2021-06-18, 09:35 authored by Stylianos Spathariotis, Nand Peeters, Karl S Ryder, Andrew P Abbott, Koen Binnemans, Sofia Riaño

Deep eutectic solvents (DESs) were used as alternatives to the aqueous phase in solvent extraction of iron(III), zinc(II) and lead(II). The selective extraction of iron(III) and zinc(II) was studied from a feed of ethaline (1[thin space (1/6-em)]:[thin space (1/6-em)]2 molar ratio of choline chloride[thin space (1/6-em)]:[thin space (1/6-em)]ethylene glycol) and lactiline (1[thin space (1/6-em)]:[thin space (1/6-em)]2 molar ratio of choline chloride[thin space (1/6-em)]:[thin space (1/6-em)]lactic acid), with the former DES being more selective. A commercial mixture of trialkylphosphine oxides (Cyanex 923, C923) diluted in an aliphatic diluent selectively extracted iron(III) from a feed containing also zinc(II) and lead(II). The subsequent separation of zinc(II) from lead(II) was carried out using the basic extractant Aliquat 336 (A336). The equilibration time and the extractant concentration were optimized for both systems. Iron(III) and zinc(II) were stripped using 1.2 mol L−1 oxalic acid and 0.5 mol L−1 aqueous ammonia, respectively. An efficient solvometallurgical flowsheet is proposed for the separation and recovery of iron(III), lead(II) and zinc(II) from ethaline using commercial extractants. Moreover, the process was upscaled in a countercurrent mixer-settler set-up resulting in successful separation and purification.

Funding

This research project has received funding from the European Union's EU Framework Programme for Research and Innovation Horizon 2020 under grant agreement no. 721385 (SOCRATES).

History

Citation

RSC Adv., 2020, 10, 33161-33170

Version

  • VoR (Version of Record)

Published in

RSC Advances

Volume

10

Issue

55

Pagination

33161 - 33170

Publisher

Royal Society of Chemistry (RSC)

eissn

2046-2069

Acceptance date

2020-08-26

Copyright date

2020

Available date

2021-06-18

Language

en

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