Infrared spectroscopy of metal carboxylates: II. Analysis of Fe(III), Ni and Zn carboxylate solutions

E. G. Palacios, G. Juárez-López, A. J. Monhemius

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The metal carboxylate complexes present in the organic solutions used in the hydrolytic stripping process strongly affect the nature of the solid precipitated; in some cases, the product is a mixed oxide while in others, a mixture of single-metal oxides is obtained. Infrared (IR) spectroscopy is a useful tool for determining the speciation of metal loaded organic phases. In the previous work, relationships of the form [V-10] = αA νM+βAνD were obtained for the estimation of the free Versatic acid present in metal carboxylate solutions at given specific temperatures. In this work, infrared spectroscopy has been used for the speciation of single-metal Versatic 10™ solutions containing Fe(III), Zn and Ni at temperatures between 20 and 200 °C. It was found that iron and zinc predominantly form complexes with bidentate structures at all the concentration levels tested, while the nickel complexes contain bidentate ligands at low concentrations and both monodentate and bidentate ligands at high concentrations. The evidence found in this work supports the existence of a binuclear ferric Versatic complex, [Fe(OH)V2]2, with chelating Versatic groups forming an octahedron around each of the iron atoms. An oxo-centred structure, containing only bridging carboxylate groups, is proposed for the zinc Versatic complex, which is believed to be present in the organic medium as Zn4O(V)6. © 2003 Elsevier B.V. All rights reserved.
Original languageAmerican English
Pages (from-to)139-148
Number of pages124
JournalHydrometallurgy
DOIs
StatePublished - 1 Feb 2004
Externally publishedYes

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carboxylates
Infrared spectroscopy
Metals
infrared spectroscopy
metals
Oxides
Zinc
Iron
zinc
Ligands
iron
ligands
mixed oxides
Metal complexes
Chelation
Nickel
stripping
metal oxides
low concentrations
nickel

Cite this

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title = "Infrared spectroscopy of metal carboxylates: II. Analysis of Fe(III), Ni and Zn carboxylate solutions",
abstract = "The metal carboxylate complexes present in the organic solutions used in the hydrolytic stripping process strongly affect the nature of the solid precipitated; in some cases, the product is a mixed oxide while in others, a mixture of single-metal oxides is obtained. Infrared (IR) spectroscopy is a useful tool for determining the speciation of metal loaded organic phases. In the previous work, relationships of the form [V-10] = αA νM+βAνD were obtained for the estimation of the free Versatic acid present in metal carboxylate solutions at given specific temperatures. In this work, infrared spectroscopy has been used for the speciation of single-metal Versatic 10™ solutions containing Fe(III), Zn and Ni at temperatures between 20 and 200 °C. It was found that iron and zinc predominantly form complexes with bidentate structures at all the concentration levels tested, while the nickel complexes contain bidentate ligands at low concentrations and both monodentate and bidentate ligands at high concentrations. The evidence found in this work supports the existence of a binuclear ferric Versatic complex, [Fe(OH)V2]2, with chelating Versatic groups forming an octahedron around each of the iron atoms. An oxo-centred structure, containing only bridging carboxylate groups, is proposed for the zinc Versatic complex, which is believed to be present in the organic medium as Zn4O(V)6. {\circledC} 2003 Elsevier B.V. All rights reserved.",
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Infrared spectroscopy of metal carboxylates: II. Analysis of Fe(III), Ni and Zn carboxylate solutions. / Palacios, E. G.; Juárez-López, G.; Monhemius, A. J.

In: Hydrometallurgy, 01.02.2004, p. 139-148.

Research output: Contribution to journalArticle

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AB - The metal carboxylate complexes present in the organic solutions used in the hydrolytic stripping process strongly affect the nature of the solid precipitated; in some cases, the product is a mixed oxide while in others, a mixture of single-metal oxides is obtained. Infrared (IR) spectroscopy is a useful tool for determining the speciation of metal loaded organic phases. In the previous work, relationships of the form [V-10] = αA νM+βAνD were obtained for the estimation of the free Versatic acid present in metal carboxylate solutions at given specific temperatures. In this work, infrared spectroscopy has been used for the speciation of single-metal Versatic 10™ solutions containing Fe(III), Zn and Ni at temperatures between 20 and 200 °C. It was found that iron and zinc predominantly form complexes with bidentate structures at all the concentration levels tested, while the nickel complexes contain bidentate ligands at low concentrations and both monodentate and bidentate ligands at high concentrations. The evidence found in this work supports the existence of a binuclear ferric Versatic complex, [Fe(OH)V2]2, with chelating Versatic groups forming an octahedron around each of the iron atoms. An oxo-centred structure, containing only bridging carboxylate groups, is proposed for the zinc Versatic complex, which is believed to be present in the organic medium as Zn4O(V)6. © 2003 Elsevier B.V. All rights reserved.

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