The role of liquid membranes in the selective separation and recovery of zinc for the regeneration of Cr(III) passivation baths

Urtiaga, Ane; Bringas, Eugenio; Mediavilla, Rosa; Ortiz, Inmaculada

doi:10.1016/j.memsci.2010.03.034

Cited by 52 publications

(38 citation statements)

References 30 publications

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“…4 collects the concentrations of the metals in the stripping phase. It is observed that chromium extraction was very low, as expected, because at the feed pH of 2.5, chromium extraction by bis(2,4,4-trimethylpentyl) phosphinic acid is not favoured [15,25]. The chromium concentration decrease observed was mainly a dilution effect caused by the addition of sodium hydroxide solution to the feed tank, necessary for the maintenance of constant pH, otherwise, the pH would decrease due to the exchange reaction between metal cations and protons, as explained before.…”

Section: Regeneration Of the Exhausted Passivation Bath: Ept Experimesupporting

confidence: 69%

“…Table 2 shows the values of the main operational variables used to carry out the EPT test. Further details about the experimental equipment and analytical procedures can be found in a previous work [15]. Metal transfer is performed at the aqueous-organic interface located at the porous membrane wall that provides a mass transfer area of 1.4 m 2 .…”

Section: Exhausted Passivating Bath Regeneration: Emulsion Pertractiomentioning

confidence: 99%

“…Emulsion Pertraction, also known as EPT, has been found an efficient process that enables successful recovery of metallic components from complex feed mixtures [12][13][14]. Moreover in a previous work [15], the regeneration of spent Cr (III) passivation baths by the selective zinc and iron membrane-based liquid-liquid extraction from complex solutions in nitric acid media was reported. Cyanex 272 (0.6 mol L −1 ) was used as commercial extractant, while both hydrochloric acid and sulphuric acid were tested as stripping agents.…”

Section: Introductionmentioning

confidence: 99%

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Zinc recovery and waste sludge minimization from chromium passivation baths

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et al. 2011

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Section: Regeneration Of the Exhausted Passivation Bath: Ept Experimesupporting

confidence: 69%

Section: Exhausted Passivating Bath Regeneration: Emulsion Pertractiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zinc recovery and waste sludge minimization from chromium passivation baths

Diban

Mediavilla

Urtiaga

et al. 2011

Journal of Hazardous Materials

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“…Selective liquid membranes have been used as efficient technologies to achieve this goal [109] . A Liqui-Cel hollow fiber membrane contactor was used to treat the spent bath with an emulsion phase constituted by an organic solution consisting of Cyanex 272, kerosene and 1-decanol and an acidic stripping phase.…”

Section: Some Applicationsmentioning

confidence: 99%

Supported liquid membranes technologies in metals removal from liquid effluents

Agreda¹,

García‐Díaz²,

López³

et al. 2011

REVMETAL

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The generation of liquid effluents containing organic and inorganic residues from industries present a potential hazardousness for environment and human health, being mandatory the elimination of these pollutants from the respective solutions containing them. In order to achieve this goal, several techniques are being used and among them, supported liquid membranes technologies are showing their potential for their application in the removal of metals contained in liquid effluents. Supported liquid membranes are a combination between conventional polymeric membranes and solvent extraction. Several configurations are used: flat-sheet supported liquid membranes, spiral wounds and hollow fiber modules. In order to improve their effectiveness, smart operations have been developed: non-dispersive solvent extraction, non-dispersive solvent extraction with strip phase dispersion and hollow fiber renewal liquid membrane. This paper overviewed some of these supported liquid membranes technologies and their applications to the treatment of metal-bearing liquid effluents. KeywordsSupported liquid membranes; Metals; Extractants; Ionic liquids; liquid effluents; Environment. Tecnologías de membranas líquidas soportadas en la eliminación de metales de efluentes líquidos ResumenLa generación, por parte de las industrias, de efluentes líquidos conteniendo sustancias orgánicas e inorgánicas, es un peligro potencial tanto para los humanos como para el medio ambiente, siendo necesaria la eliminación de estos elementos tóxicos de las disoluciones que los contienen. Para conseguir este fin, se están aplicando diversas técni-cas y entre ellas las tecnologías de membranas líquidas soportadas, están demostrando sus aptitudes para la eliminación de metales contenidos en efluentes líquidos. Las membranas líquidas soportadas, resultan de la unión de las membranas poliméricas y de la tecnología de extracción líquido-líquido. Este tipo de membranas se pueden utilizar en diversas configuraciones: plana, módulo en fibra hueca y módulo en espiral y para aumentar su efectividad se están desarrollando las llamadas operaciones avanzadas: extracción no dispersiva, extracción no dispersiva con dispersión de la fase de reextracción y empleo del módulo de fibra hueca, con renovación de la membrana líquida. En este trabajo se revisan estas operaciones de membranas líquidas soportadas y algunas de las aplicaciones de las mismas, en el tratamiento de efluentes líquidos conteniendo metales. Palabras claveMembranas líquidas soportadas; Metales; Agentes de extracción; Líquidos iónicos; Efluentes líquidos; Medio ambiente.

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“…The main benefit of the process is that Cr (III) regeneration is conducted during passivation. This process for the regeneration of Cr (III) baths is being studied in detail at laboratory scale [16][17][18][19] and it has already been implemented at industrial scale [12].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the electrochemical behaviour of Zn-electroplated steel using regenerated Cr (III) passivation baths

Garcı́a-Antón

Fernández‐Domene

Sánchez-Tovar

et al. 2014

Chemical Engineering Science

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ElsevierGarcía Antón, J.; Fernández Domene, RM.; Sánchez Tovar, R.; Escrivá Cerdán, C.; Leiva García, R.; García, V.; Urtiaga, A. (2014). Improvement of the electrochemical behaviour of Zn-electroplated steel using regenerated Cr(III) passivation baths. AbstractConversion coatings based on trivalent chromium are more sensitive to the presence of zinc and iron impurities than the chromate formulations. This fact contributes to a decrease in the quality of passivation and to the generation of a significant amount of hazardous liquid waste. Recently, a new eco-innovative process based on Emulsion Pertraction Technology (EPT) is being implemented at industrial scale for selectively removing Zn and Fe from spent passivation baths in order to enhance the lifetime of the Cr (III) baths. In this study, the effect of Zn and Fe removal on the electrochemical behaviour of Zn-electroplated steel samples was evaluated by means of polarisation curves and electrochemical impedance spectroscopy measurements at open circuit potential conditions in 3.5 g/L NaCl solutions. The main objective was to assess the benefits brought by EPT using electrochemical methods. Cr (III) passivation baths regenerated using the EPT process have been compared to the bath used in a local industry as well as to fresh and spent baths. According to the results, the samples passivated in the EPT regenerated bath showed a significant improvement in their electrochemical behaviour compared to the samples passivated in the spent baths. This study concluded the suitability of EPT for regenerating Cr(III) passivation baths.

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The role of liquid membranes in the selective separation and recovery of zinc for the regeneration of Cr(III) passivation baths

Cited by 52 publications

References 30 publications

Zinc recovery and waste sludge minimization from chromium passivation baths

Zinc recovery and waste sludge minimization from chromium passivation baths

Supported liquid membranes technologies in metals removal from liquid effluents

Improvement of the electrochemical behaviour of Zn-electroplated steel using regenerated Cr (III) passivation baths

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