The Screening of Extractants for the Separation of Zn(II) from Australian Hot-Dip Galvanizing Effluent

Cook, Samuel J.; Perera, Jilska M.; Stevens, Geoffrey W.; Kentish, Sandra E.

doi:10.1080/01496395.2011.593018

Cited by 28 publications

(5 citation statements)

References 10 publications

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“…The results indicate that iron is extracted and the rate is affected by process configuration. Several studies have reported extraction of iron(II) from 0.5% to 10% using TBP. ,,,− In SPS, the total iron is present mainly as iron(II) in the forms of Fe 2+ and a minor amount of FeCl + and both cationic species should be rejected by TBP due to its solvating nature . However, TBP may act also as a surfactant and Regel-Rosocka and co-workers − suggested that iron(II) was transported from the aqueous solution to the stripping phase by means of nonselective micromicelles.…”

Section: Results and Discussionmentioning

confidence: 99%

“…It is reported that steelwork plants in the EU produce 300 000 m 3 per year of spent pickling solutions (SPS), which are of environmental concern due to their high content in heavy metals and acids. Typical concentrations of zinc, iron and hydrochloric acid are in the ranges of 20–120, 100–130 and 1–6 mol L –1 , respectively. − …”

Section: Introductionmentioning

confidence: 99%

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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 Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…On the basis of our prior work and the composition of the waste solution, TBP is the most suitable extractant for the removal of zinc from Australian galvanizing effluent. 1 In the present study, 50 vol % TBP (Ajax Chemicals, 99.9%) in Shellsol 2046 (Shell Chemicals, 69 wt % paraffin, 14 wt % naphthenes, naphthalenes, 17 wt % aromatics) was used.…”

Section: Methodsmentioning

confidence: 99%

“…With the effluent composed of 5 to over 200 g/L zinc, 60 to 150 g/L iron, and 10 to 80 g/L HCl, − the highly contaminated liquors lend themselves to the use of solvent extraction for the recovery of these species. In particular, the zinc is of high value if it can be recovered in a suitable form.…”

Section: Introductionmentioning

confidence: 99%

Zinc Chloride and Hydrochloric Acid Coextraction from Galvanizing Pickling Waste in the Presence of Iron(II). Results with Hollow Fiber Membrane Contactors

Lum

Cook

Stevens

et al. 2014

Ind. Eng. Chem. Res.

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Spent pickling acid from the industrial galvanizing process currently requires specialist disposal, yet there is the potential to recover the zinc as a valuable metal. In this work, we compare the extraction of zinc using tributyl phosphate from real galvanizing effluent and laboratory prepared solutions. Both commercial and handmade hollow fiber membrane contactors are used for this purpose. While the zinc is effectively extracted, care must be taken to prefilter the solution upstream of the membrane contactor to minimize crud formation and interfacial effects. The extraction of both zinc and HCl from the effluent is satisfactorily described using mathematical models for both the multicomponent equilibria and mass transfer balances. In development of the multicomponent equilibrium model, the thermodynamic equilibrium constants obtained from the ZnCl2–NaCl–HCl aqueous system were found to be applicable to the ZnCl2–FeCl2–HCl system.

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“…O processo de galvanização normalmente é realizado por imersão em diversas etapas, envolvendo soluções extremamente ácidos ou básicos. Em uma dessas etapas, o ácido de decapagem pode gerar um alto volume de resíduos líquidos contendo ferro, em concentrações de 60 a 150 g L -1 (BAO et al,2016;COOK et al, 2011;STOCKS, WOOD, GUY. 2005).…”

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Índices De Tratamento De Efluentes Domésticos Urbanos Da Região Noroeste Fluminense Do Estado Do Rio De Janeiro

Corrêa¹,

Tomazzi²

2021

Fundamentos Da Engenharia Sanitária E Ambiental

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The Screening of Extractants for the Separation of Zn(II) from Australian Hot-Dip Galvanizing Effluent

Cited by 28 publications

References 10 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

Zinc Chloride and Hydrochloric Acid Coextraction from Galvanizing Pickling Waste in the Presence of Iron(II). Results with Hollow Fiber Membrane Contactors

Índices De Tratamento De Efluentes Domésticos Urbanos Da Região Noroeste Fluminense Do Estado Do Rio De Janeiro

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