Modelling of the Extraction and Back-Extraction Equilibria of Zinc from Spent Pickling Solutions

This work reports the study of the chemical equilibria of the extraction and back-extraction of zinc from spent pickling solutions. Tributyl phosphate was used as a selective extractant and service water as a back extraction agent. Feed solutions had an average composition of 6.4 M Cl − , 1.2 M Zn +...

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Published inSeparation science and technology Vol. 41; no. 4; pp. 757 - 769
Main Authors Samaniego, Henar, San Román, M. Fresnedo, Ortiz, Inmaculada
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.04.2006
Subjects
back-extraction
Extraction equilibrium
tributyl phosphate
water
zinc chloride
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Summary:This work reports the study of the chemical equilibria of the extraction and back-extraction of zinc from spent pickling solutions. Tributyl phosphate was used as a selective extractant and service water as a back extraction agent. Feed solutions had an average composition of 6.4 M Cl − , 1.2 M Zn +2 , 1.7 M Fe +2 and traces of other heavy metals i.e., Pb, Ni, Cu, Mn. Under the experimental conditions the ion ZnCl 4 2− was the predominant zinc species in feed. A careful experimental design was performed obtaining the equilibria mathematical models and parameters, K EX =0.137 (mol/L) −4 , and K BEX =1.46 [−].
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ISSN:0149-6395
1520-5754
DOI:10.1080/01496390600552289