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

作者：Fresnedo San Roman M; Ortiz Gandara Isabel; Bringas Eugenio; Ibanez Raquel; Ortiz Inmaculada^*

来源：Desalination, 2018, 440: 78-87.

DOI：10.1016/j.desal.2018.02.005

• Membrane-based solvent extraction
• Electrodialysis
• Zinc chloro-complexes recovery
• Iron chloro-complexes recovery
• HCl recovery

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.

• 出版日期2018-8-15