Modelling of the Extraction and Back‐Extraction Equilibria of Zinc from Spent Pickling Solutions

Samaniego, Henar; Román, M. Fresnedo San; Ortiz, Inmaculada

doi:10.1080/01496390600552289

Cited by 28 publications

(10 citation statements)

References 9 publications

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“…From the results depicted in Figure , it is confirmed that all the values of the molar ratio chloride/zinc obtained in the extraction and back-extraction experiments were within the range from 2 to 4, as expected from the general formula of zinc chlorocomplexes. However, most of the data varied in the range from 3 to 2, thus confirming, as expected from the literature, that HZnCl 3 and ZnCl 2 were the preferable extracted species that react with TBP as follows HZnCl 3 + 3 TBP true̅ ⇔ HZnCl 3 · 3 TBP true̅ ZnCl 2 + 2 TBP true̅ ⇔ ZnCl 2 · 2 TBP true̅ …”

Section: Results and Discussionsupporting

confidence: 84%

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Selective Recovery of Zinc over Iron from Spent Pickling Wastes by Different Membrane-based Solvent Extraction Process Configurations

Laso

García

Bringas

et al. 2015

Ind. Eng. Chem. Res.

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This paper reports the selective separation of zinc over iron from spent pickling wastes or effluents using two different membrane-based solvent extraction process configurations, Nondispersive solvent extraction (NDSX) and emulsion pertraction technology (EPT). The process aims to obtain a highly concentrated zinc solution with a negligible content of iron to allow for Zn electrowinning. The effect of the following process variables on the kinetics and selectivity of zinc separation has been evaluated: (i) process configuration NDSX and EPT, (ii) extractant concentration, tributylphosphate (TBP) in the range of 20–100% v/v and (iii) stripping phase/feed phase volume ratio in the range V s/V a 0.2–2. The transport of iron, chloride and free acid has been also monitored to gain insight into the separation fundamentals. EPT configuration overcame NDSX in terms of zinc and iron separation kinetics, although separation selectivity (at 30 min) was higher for NDSX configuration, αZn/Fe = 22, compared to EPT process αZn/Fe = 15. The optimum TBP content in the extractant phase was found to be 50% v/v. A further increase did not improve the Zn recovery kinetics and reduced the Zn/Fe selectivity. The increase of the V s/V a ratio improved the process efficacy in terms of kinetics and zinc recovery.

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Section: Results and Discussionsupporting

confidence: 84%

“…Regel-Rosocka et al reported that at low acidity of the feed phase ZnCl 2 was the predominant species and at higher acidity HZnCl 3 and H 2 ZnCl 4 were found. Several researchers determined that the predominant zinc–chloro complex in the SPS was H 2 ZnCl 4 using MEDUSA software. ,,,− …”

Section: Results and Discussionmentioning

confidence: 99%

Selective Recovery of Zinc over Iron from Spent Pickling Wastes by Different Membrane-based Solvent Extraction Process Configurations

Laso

García

Bringas

et al. 2015

Ind. Eng. Chem. Res.

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“…In the present study, the species present in the feed solution, as predicted by Medusa, are Cl − , ZnCl 4 2− , ZnCl 3− , ZnCl 2 , ZnCl + , Zn 2+ , Fe 2+ and FeCl + , of which ZnCl 4 2− and Fe 2+ are the predominant ones. This confirms that the high ionic strength of the SPA leads to the formation of chlorocomplexes with a high stoichiometric coefficient of chlorine [ 51 ]. The speciation of zinc as negative chlorocomplexes and iron as positive species opens the door to the selective separation of zinc, as TBP extracts negative species preferentially.…”

Section: Resultssupporting

confidence: 67%

Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

et al. 2020

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Zinc recovery from spent pickling acids (SPAs) can play an important role in achieving a circular economy in the galvanizing industry. This work evaluates the scale-up of membrane-based solvent extraction technology aimed at the selective separation of zinc from industrial SPAs as a purification step prior to zinc electrowinning (EW). The experiments were carried out at a pilot scale treating SPAs batches of 57 to 91 L in a non-dispersive solvent extraction (NDSX) configuration that simultaneously performed the extraction and backextraction steps. The pilot plant was equipped with four hollow fiber contactors and 80 m2 of total membrane area, which was approximately 30 times higher than previous bench-scale studies. Tributylphosphate diluted in Shellsol D70 and tap water were used as organic and stripping agents, respectively. Starting with SPAs with high Zn (71.7 ± 4.3 g·L−1) and Fe (82.9 ± 5.0 g·L−1) content, the NDSX process achieved a stripping phase with 55.7 g Zn·L−1 and only 3.2 g Fe·L−1. Other minor metals were not transferred, providing the purified zinc stripping with better quality for the next EW step. A series of five consecutive pilot-scale experiments showed the reproducibility of results, which is an indicator of the stability of the organic extractant and its adequate regeneration in the NDSX operation. Zinc mass transfer fluxes were successfully correlated to zinc concentration in the feed SPA phase, together with data extracted from previous laboratory-scale experiments, allowing us to obtain the design parameter that will enable the leap to the industrial scale. Therefore, the results herein presented demonstrate the NDSX technology in an industrially relevant environment equivalent to TRL 6, which is an essential progress to increase zinc metal resources in the galvanizing sector.

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“…The membrane based extraction can be realized in the system of two modules with the organic phase circulating in the shell side of the modules [64,[67][68][69][74][75][76][77][78] or in one module in which polymeric support is impregnated with the organic phase -SLM [79]. Zn(II) transport through supported liquid membrane (SLM) impregnated with 30% Cyanex 923 in Solvesso 100 is controlled by diffusion in the aqueous solution, and needs a long time.…”

Section: Classical and Membrane Based Solvent Extractionmentioning

confidence: 99%

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

Regel‐Rosocka

2010

Journal of Hazardous Materials

244

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Modelling of the Extraction and Back‐Extraction Equilibria of Zinc from Spent Pickling Solutions

Cited by 28 publications

References 9 publications

Selective Recovery of Zinc over Iron from Spent Pickling Wastes by Different Membrane-based Solvent Extraction Process Configurations

Selective Recovery of Zinc over Iron from Spent Pickling Wastes by Different Membrane-based Solvent Extraction Process Configurations

Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

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

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