Processing of steel rinse waters through coextraction and selective stripping

Lobo-Recio, María Ángeles; López‐Delgado, Aurora

doi:10.1002/aic.10110

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…However, the authors have not mentioned metal ion co-extraction and have not proposed management of the metal salts. Another solvating extractant, Cyanex 923 (a mixture of phosphine oxides) can be successfully applied to recover Fe(III), HNO 3 , and HF with high efficiency [58]. Coextraction (E Fe(III) = 90.6%, E HNO3 = 80.3%, E HF = 85.7%) and selective stripping of iron(III), HNO 3 , and HF with water prove that this method is suitable for SPS processing.…”

Section: Classical and Membrane Based Solvent Extractionmentioning

confidence: 97%

A review on methods of regeneration of spent pickling solutions from steel processing

Regel‐Rosocka

2010

Journal of Hazardous Materials

245

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Section: Classical and Membrane Based Solvent Extractionmentioning

confidence: 97%

A review on methods of regeneration of spent pickling solutions from steel processing

Regel‐Rosocka

2010

Journal of Hazardous Materials

245

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“…Although neutralization of these waters with lime commonly occurs prior to its discharge, more stringent legislation regarding the discharge of nitrates and other pollutants has led to investigations into the use of more advanced and environmentally friendly techniques for the treatment of these rinse waters. One of the proposed methods combined the use of a membrane (filtering, reverse osmosis, electrodyalisis) and ion exchange technologies [16,17] though the use of liquid-liquid extraction [18], and other technologies [19] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Stainless Steel Rinse Waters Using Non-Dispersive Extraction and Strip Dispersion Membrane Technology

Alguacil,

Robla

2023

Membranes

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The extraction of Fe(III), Cr(III), and Ni(II) from stainless steel rinse water using non-dispersive extraction and strip dispersion membrane technology was carried out in a microporous hydrophobic hollow-fibre module contactor. The fibres were of polypropylene, whereas the organic extractant DP8R (bis(2-ethylhexyl) phosphoric acid) diluted in ExxsolD100 was used as the carrier phase. The rinse water containing the three elements was passed through the tube side, and the pseudo-emulsion formed by the organic phase of DP8R in Exxol D100 and an acidic strip solution were passed through the shell side in a counter-current operation; thus, a unique hollow fibre module was used for extraction and stripping. In non-dispersive extraction and strip dispersion technology, the stripping solution was dispersed into the organic membrane solution in a vessel with an adequate mixing device (impeller) designed to form strip dispersion. This pseudo-emulsion was circulated from the vessel to the membrane module to provide a constant supply of the organic phase to the membrane pores. Different hydrodynamic and chemical variables, such as variation in feed and pseudo-emulsion flow rates, strip phase composition, feed phase pH, and extractant concentration in the organic phase, were investigated. Mass transfer coefficients were estimated from the experimental data. It was possible to separate and concentrate the metals present in the rinse water using the non-dispersive extraction and strip dispersion technique.

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“…It has been used in the extraction of a wide range of metals, including rare earth elements (REEs), transition metals, and precious metals. [26][27][28][29][30][31] In general, extraction of metals by C923 is stronger than extraction by TBP, either for extraction by TBP or C923 alone, 26,32,33 or in combination with another extractant for synergic solvent extraction. 34,35 Recently, it was found that C923 and ciency through the same ion-pair extraction mechanism as the TBP/FeCl 3 (or IL) systems.…”

Section: Introductionmentioning

confidence: 99%

“…Cyanex 923 (C923, a commercial mixture of trialkyl phosphine oxides with mainly n ‐hexyl and n ‐octyl, shown in Figure 1) is a popular commercial neutral extractant that is similar to TBP. It has been used in the extraction of a wide range of metals, including rare earth elements (REEs), transition metals, and precious metals 26‐31 . In general, extraction of metals by C923 is stronger than extraction by TBP, either for extraction by TBP or C923 alone, 26,32,33 or in combination with another extractant for synergic solvent extraction 34,35 .…”

Section: Introductionmentioning

confidence: 99%

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

Binnemans

2021

AIChE Journal

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The synergic solvent extraction system of tri-n-butyl phosphate (TBP) and FeCl 3 (or ionic liquids, ILs) has been extensively studied for selective extraction of Li from Mg-containing brines. However, Cyanex 923 (C923), which extracts many metals stronger than TBP, has not yet been examined for Li/Mg separation. Here, we report on the unexpected observation that the C923/FeCl 3 system has opposite Li/Mg selectivity compared to the TBP/FeCl 3 system. Detailed investigations show that the opposite selectivity of the C923/FeCl 3 (or IL) system is due to three factors: (1) the strong extraction of Fe by C923 leads to a low concentration of [FeCl 4 ] − in the system, which is essential for Li extraction; (2) C923 in combination with an IL extracts Mg strongly by an ion-pair mechanism; (3) most importantly, C923 extracts Mg by solvation, resulting in an insufficient concentration of C923 for Li extraction. The unexpected poor Li/Mg selectivity of C923 highlights the irreplaceable role of TBP in the selective recovery of Li.

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Processing of steel rinse waters through coextraction and selective stripping

Abstract: Recovery of iron(III),

Cited by 8 publications

References 14 publications

A review on methods of regeneration of spent pickling solutions from steel processing

A review on methods of regeneration of spent pickling solutions from steel processing

Treatment of Stainless Steel Rinse Waters Using Non-Dispersive Extraction and Strip Dispersion Membrane Technology

Opposite selectivities of tri‐n‐butyl phosphate and Cyanex 923 in solvent extraction of lithium and magnesium

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