Selective removal of iron(III) from highly salted chloride acidic solutions by solvent extraction using di(2-ethylhexyl) phosphate

doi:10.1007/s11705-020-1955-4

Front. Chem. Sci. Eng.

2021, Vol. 15

Issue (3) : 528-537 https://doi.org/10.1007/s11705-020-1955-4

RESEARCH ARTICLE

Selective removal of iron(III) from highly salted chloride acidic solutions by solvent extraction using di(2-ethylhexyl) phosphate

Guoping Hu^1,²(

), Yue Wu², Desheng Chen¹, Yong Wang¹, Tao Qi¹, Lina Wang¹(

)

¹. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
². Department of Chemical Engineering, The University of Melbourne, Victoria 3010, Australia

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Abstract

Metal ions including Fe³⁺, Ca²⁺, Mg²⁺, Ni²⁺, Co²⁺ and Cu²⁺ are commonly found in the leaching solution of laterite-nickel ores, and the pre-removal of Fe³⁺ is extremely important for the recovery of nickel and cobalt. Di(2-ethylhexyl)phosphate acid (D2EHPA) showed high extraction rate and selectivity of Fe³⁺ over other metal ions. The acidity of the aqueous solution is crucial to the extraction of Fe³⁺, and the stoichiometry ratio between Fe³⁺ and the extractant is 0.86:1.54. The enthalpy for the extraction of Fe³⁺ using D2EHPA was 19.50 kJ/mol. The extraction of Fe³⁺ was ≥99% under the optimized conditions after a three-stage solvent extraction process. The iron stripping effects of different reagents showed an order of H₂C₂O₄>NH₄HCO₃>HCl>NaCl>NaHCO₃>Na₂SO₃. The stripping of Fe was ≥99% under the optimized conditions using H₂C₂O₄ as a stripping reagent.

Keywords solvent extraction iron di(2-ethylhexyl)phosphate acid separation

Corresponding Author(s): Guoping Hu,Lina Wang

Online First Date: 10 October 2020 Issue Date: 10 May 2021

Cite this article:

Guoping Hu,Yue Wu,Desheng Chen, et al. Selective removal of iron(III) from highly salted chloride acidic solutions by solvent extraction using di(2-ethylhexyl) phosphate[J]. Front. Chem. Sci. Eng., 2021, 15(3): 528-537.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-1955-4
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I3/528

Tab.1 Elemental distribution (wt-%) of a typical saprolitic laterite ore [2]

Fig.1 Effects of impurity metal ions on the extraction of Fe (Fe concentration of 5.3 g/L, initial H⁺ concentration of 0.60 mol/L, temperature of 25 °C, phase ratio (O/A) of 1:1, D2EHPA concentration of 10% and equilibrium time of 60 min).

Fig.2 Effects of acidity on the extraction of Fe (initial Fe concentration of 4.1 g/L, equilibrium time of 60 min, temperature of 25 °C, phase ratio (O/A) of 1:1 and D2EHPA concentration of 10%).

Fig.3 Effects of equilibrium time on the extraction of Fe (initial Fe concentration of 4.5 g/L, initial H⁺ concentration of 0.68 mol/L, temperature of 25 °C, phase ratio (O/A) p of 1:1 and D2EHPA concentration of 10%).

Fig.4 Effects of phase ratio (O/A) on the extraction of Fe (initial Fe concentration of 4.4 g/L, initial H⁺ concentration of 0.60 mol/L, temperature of 25 °C, equilibrium time of 60 min and D2EHPA concentration of 10%).

Fig.5 Effects of temperature on the extraction of Fe³⁺ (initial Fe concentration of 4.0 g/L, initial H⁺ concentration of 0.60 mol/L, equilibrium time of 60 min, phase ratio (O/A) of 1:1 and D2EHPA concentration of 10%).

Fig.6 Effects of D2EHPA concentration on the extraction of Fe³⁺ (initial Fe concentration of 4.9 g/L, initial H⁺ concentration of 0.60 mol/L, temperature of 25 °C, phase ratio (O/A) of 1:1 and equilibrium time of 60 min).

Fig.7 Effects of Fe³⁺ concentration on the extraction of Fe³⁺ (equilibrium time of 60 min, initial H⁺ concentration of 0.60 mol/L, temperature of 25 °C, phase ratio (O/A) of 1:1 and D2EHPA concentration of 10%).

Fig.8 Effects of KCl addition on the extraction of Fe³⁺ (Fe³⁺ concentration of 5.0 g/L, initial H⁺ concentration of 0.60 mol/L, temperature of 25 °C, phase ratio (O/A) of 1:1, D2EHPA concentration of 10% and equilibrium time of 60 min).

Tab.2 Extraction of Fe over three stages

Tab.3 Stripping of Fe³⁺ using different stripping reagents

Fig.9 Effects of the concentration of H₂C₂O₄ on the stripping of Fe³⁺.

Fig.10 Effects of phase ratio (O/A) on the stripping of Fe³⁺.

Fig.11 Effects of equilibrium time on the stripping of Fe³⁺.

Tab.4 Three-stage stripping of Fe using HCl and H₂C₂O₄ as stripping agents

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