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

A.D.  Toache; L.E.  Hernández; G.T.  Lapidus; F.  Legorreta G.

doi:10.29057/aactm.v2i2.9704

A.D. Toache Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0003-2178-9787
L.E. Hernández Universidad Autónoma del Estado de Hidalgo
G.T. Lapidus Universidad Autonoma Metropolitana https://orcid.org/0000-0002-1792-8513
F. Legorreta G. Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0001-6968-199X

DOI: https://doi.org/10.29057/aactm.v2i2.9704

Keywords: Iron, Kaolin, D2EHPA, Cyanex 272, Citric acid

Abstract

Recently Olvera-Venegas [1] developed a method for bleaching kaolinitic clays using citric acid and sodium thiosulfate; however, the liquor from this process contains high concentrations of iron which prohibits an untreated discharge. To eliminate iron from these solutions, in this paper, the results of solvent extraction with D2EHPA (0.6 y 1.5 M) or Cyanex 272 (1.7 y 3 M), diluted in kerosene and toluene, respectively, or a mixture of both extractants (D2EHPA (0.2 M)/Cyanex 272(2 M)), diluted in kerosene) are presented. To elucidate the behavior of the solvents, experiments were performed with both synthetic solutions of iron (FeSO₄ and Fe₂ (SO₄)₃), as with the leach liquor. The concentration of the extractants was varied, maintaining constant the pH at 3 during 60 minutes. An aqueous sulfuric acid solution (200 g L^-1) was used for stripping. The percentage of iron extraction and stripping was quantified in the aqueous phase using atomic absorption spectrometry. The best extraction results for synthetic solutions were 100% for Fe²⁺, 98.5% for Fe³⁺ and 92%, for the leach liquor using both concentrations of D2EHPA (0.6 and 1.5 M).

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