Investigations on the complete removal of iron(III) interference on the uranium(VI) extraction from sulfate leach liquor using Alamine 336 in kerosene

Fereshte Khanramaki; Jaber Safdari; Amir S. Shirani; Rezvan Torkaman

doi:10.1515/ract-2017-2906

Article

Investigations on the complete removal of iron(III) interference on the uranium(VI) extraction from sulfate leach liquor using Alamine 336 in kerosene

Fereshte Khanramaki , Jaber Safdari , Amir S. Shirani and Rezvan Torkaman

Published/Copyright: April 4, 2018

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From the journal Radiochimica Acta Volume 106 Issue 8

Abstract

Uranyl sulfate obtained by uranium ore leaching of an industrial sample deposit of Gachin site was used for uranium separation by the solvent extraction technique. The presence of other elements in the sulfate leach liquors has a negative impact on the uranium extraction process using Alamine 336; therefore, the operating costs are increased. In this study, the separation of uranium(VI) and iron(III) by Alamine 336 and kerosene have been examined as an extractant and a diluent, respectively. For this purpose, the effects of operating parameters on the extraction process such as Alamine 336 concentration, modifier concentration, contact time, initial aqueous pH, sulfate ion concentration, temperature, and stripping agents were investigated. Also, the complete removal of iron(III) interference from the sulfate leach liquor before the extraction step has been studied with reducing agents. The equilibrium constants and stoichiometric coefficients for uranium and iron extraction with Alamine 336 in the sulfate leach liquors were calculated. Likewise, the values of the thermodynamic parameters such as Gibbs energy, enthalpy and entropy were determined to prove the exothermic and spontaneous reactions. The mentioned procedure is proposed for the uranium separation from the impurities in the sulfate ores using tertiary amine for production of purified uranium.

Keywords: Solvent extraction; uranium(VI) separation; iron(III) interference; Alamine 336; sulfate leach liquor

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Received: 2017-12-04

Accepted: 2018-02-12

Published Online: 2018-04-04

Published in Print: 2018-08-28

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https://doi.org/10.1515/ract-2017-2906

Keywords for this article

Solvent extraction; uranium(VI) separation; iron(III) interference; Alamine 336; sulfate leach liquor