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Membrane selective recovery of HCl, zinc and iron from simulated mining effluents

Abstract: This work proposes a flowsheet based on the combination of membrane processes for the effective recovery of value-added components contained in mining effluents with high concentration of hydrochloric acid and metal anionic and cationic chloro-complexes. A representative case of study has been selected consisting of a solution of zinc and iron that under the studied conditions were solubilized forming anionic and cationic chloro-complexes. The high complexity of the system requires of a selective membrane-based solvent extraction step to successfully achieve the separation of cationic iron from a solution containing the acid together with anionic species of zinc followed by a diffusion process through ion conductive membranes for acid recovery; in this step electrodialysis was selected searching for the optimum trade-off between process kinetics and separation selectivity. Although the quantitative results are case-dependent, the methodology can be well extended to any mining leaching effluent coming from the use of HCl as leaching agent and containing metal chloro-complexes.

 Autoría: San Román M., Ortiz-Gándara I., Bringas E., Ibañez R., Ortiz I.,

 Fuente: Desalination, 2018, 440, 78-87

 Editorial: Elsevier

 Fecha de publicación: 15/08/2018

 Nº de páginas: 10

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.desal.2018.02.005

 ISSN: 0011-9164

 Proyecto español: TM2014-58029-R ; CTM2014-57833-R ; CTQ2015-66078-R

 Url de la publicación: https://doi.org/10.1016/j.desal.2018.02.005