Solvent extraction of Ti(IV), Fe(III) and Fe(II) from acidic sulfate medium with di-o-tolyl phosphoric acid-benzene — hexan-1-ol system: A separation and mechanism study

Islam, Muhammad; Biswas, R.K.; Mustafa, C. M.

doi:10.1016/0304-386x(85)90023-4

Cited by 27 publications

(5 citation statements)

References 13 publications

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“…They found that in the presence of chloride ion, the extraction rate was accelerated due to the formation of FeCl 2+ species which react more rapidly with TTA than do the Fe 3+ species, and the reactions in the former case were higher than those of the latter by a factor of 28. Second-order dependence of D2EHPA for iron(III) extraction was also reported by Islam et al [5] They reported Fe(OH)R 2 as extracted species at 0.35 M sulfuric acid concentration in the aqueous phase. Hydrolysis of iron(III) occurs in the aqueous phase at low acid concentration and gives [Fe(OH)] 2+ , which requires two molecules of D2EHPA to form the preceding extractable species.…”

Section: B Iron(iii) Extraction With D2ehpasupporting

confidence: 57%

“…In the case of iron(III), third-power dependence on the iron extraction is generally accepted, [5] in which case the extraction mechanism should follow the equilibrium with n ϭ 3:…”

Section: B Iron(iii) Extraction With D2ehpamentioning

confidence: 99%

“…[5] and [9], In order to evaluate the contribution of TBP to adduct formation, the D values were measured by varying the concentration of TBP at fixed D2EHPA(RH) concentration. Figure 7 shows the plots of log D R,T /D R against log [TBP], which are best fitted to standard second-order polynomial curves with limiting slopes of 1.01 ‫)30.0ע(‬ and 1.93 ‫,)21.0ע(‬ indicating that the highest adduct contains two molecules of TBP.…”

Section: Adduct Formationmentioning

confidence: 99%

“…Over the past 3 decades, a considerable amount of work has been carried out and reported [3][4][5][6][7][8][9][10][11][12][13][14] on iron(III) removal from solutions by solvent extraction. Most of these studies, however, examine the extraction of iron when its concentration in solution is not very high, which will be the condition if pure iron oxide is produced in bulk through solvent extraction techniques.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Sahu

Das

1997

Metall Mater Trans B

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The extraction of iron(III) from chloride solutions at macrolevel concentration by different solvents such as tri-n-butyl phosphate (TBP), di(2-ethylhexyl) phosphoric acid (D2EHPA), and their mixture in various proportions has been investigated at different acid concentrations. The synergistic extraction of iron(III) with a mixture of TBP and D2EHPA was studied and the results were compared with that of the extraction by individual solvent alone. An increase in the concentration of the synergist, TBP, in the D2EHPA-TBP solvent system resulted in an increase in the synergistic coefficient value. The experimental data are treated graphically to explain the formation of organic phase extracted species, and the equilibrium extraction constants for the species are determined. It is found that a maximum of two molecules of TBP are adducted to the extracted species of the corresponding nonsynergistic system. Stripping of iron(III) with hydrochloric acid from loaded D2EHPA was found to increase with an increase in acid concentration. In the case of D2EHPA-TBP mixtures, stripping efficiency was increased with an increase in acid concentration up to a certain level and then it was decreased. The experimental results indicate that an iron exchange reaction between loaded D2EHPA and TBP proceeds during stripping at a higher concentration of hydrochloric acid (from mixed loaded solvent system). A plausible mechanism for iron(III) extraction and stripping has been discussed.

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Section: B Iron(iii) Extraction With D2ehpasupporting

confidence: 57%

“…In the case of iron(III), third-power dependence on the iron extraction is generally accepted, [5] in which case the extraction mechanism should follow the equilibrium with n ϭ 3:…”

Section: B Iron(iii) Extraction With D2ehpamentioning

confidence: 99%

Section: Adduct Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Sahu

Das

1997

Metall Mater Trans B

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“…En este sentido, en 1979 Islam y colaboradores realizaron un estudio de la extracción con solventes de titanio (IV), hierro (III) y hierro (II) utilizando ácido di-2-etil hexil fosfórico en benceno, obteniendo muy buenos resultados, con una máxima extracción de titanio(IV) y hierro (II) a 50°C [4]. Nuevamente en el año de 1985 éstos mismos autores, realizaron pruebas para la extracción de los mismos tres iones, ahora utilizando un sistema Di-tolil-ácido fosfórico y benceno; mostraron que se obtiene el mayor porcentaje de extracción de Fe(II) a mayor concentración de este extractante y con cierta acidez acuosa [5]. Chu Yong en el 2000 realizó un estudio para la extracción con D2EHPA modificando el pH y la temperatura para recuperar diversos metales, encontrando para siete elementos de interés el siguiente orden de extracción Zn(II)>Ca(II)>Mn(II)>Cu(II)>Co(II)>Ni(II)>Mg(II).…”

Section: Introductionunclassified

Extracción con solventes de Fe contenido en soluciones provenientes de la lixiviación de arcillas caoliníticas utilizando como extractantes D2EHPA y CYANEX 272

Toache-Pérez

Hernández

Lapidus

et al. 2015

aactm

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Recientemente Olvera-Venegas [1] desarrolló un método para el blanqueamiento de arcillas caoliníticas mediante el uso de ácido cítrico y tiosulfato de sodio, pero los licores provenientes de este proceso contienen grandes concentraciones de hierro, lo cual impide que puedan ser vertidos sin tratamiento previo. Para eliminar el hierro, en este trabajo se presentan los resultados obtenidos en las pruebas de extracción con solventes utilizando los extractantes D2EHPA (0.6 y 1.5 M) y Cyanex 272 (1.7 y 3 M), diluidos en queroseno y tolueno y una mezcla de ambos solventes (0.2 M D2EHPA y 2 M Cyanex 272, diluidos en queroseno). Para elucidar el comportamiento de los solventes, los experimentos se realizaron, tanto con soluciones sintéticas de hierro (FeSO₄ y Fe₂(SO₄)₃) con ácido cítrico (0.9M), como con los licores de lixiviación. La variable de estudio fue la concentración de los extractantes, manteniendo constante el pH en 3 durante 60 minutos. Se utilizó una solución de 200 g L⁻¹ de ácido sulfúrico como solución de despojo. Para cuantificar el porcentaje de extracción y de despojo de hierro se utilizó espectrometría de absorción atómica. Los mejores resultados de extracción se lograron con ambas concentraciones de D2EHPA (0.6 y 1.5 M) para las soluciones sintéticas: 100% para Fe²⁺, 98.5% para Fe³⁺ y 92% de extracción, para el licor de lixiviación. En cuanto al despojo del solvente cargado el mejor resultado se obtuvo al despojar el Cyanex 272, a cualquier concentración a la que se trabajó, llegando a re-extraer hasta un 91.5% de hierro, de igual manera en la mezcla de ambos solventes se llegó a un porcentaje de despojo de 75.8% para el Fe ²⁺ y 44% para el licor de lixiviación.

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Technical Developments in Hydrometallurgy

Hiskey¹

1986

JOM

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Solvent extraction of Ti(IV), Fe(III) and Fe(II) from acidic sulfate medium with di-o-tolyl phosphoric acid-benzene — hexan-1-ol system: A separation and mechanism study

Cited by 27 publications

References 13 publications

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Extracción con solventes de Fe contenido en soluciones provenientes de la lixiviación de arcillas caoliníticas utilizando como extractantes D2EHPA y CYANEX 272

Technical Developments in Hydrometallurgy

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