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Article

Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing

1
Chemical and Biomolecular Engineering Department, University of Cantabria, Avda. Los Castros, s.n., 39005 Santander, Spain
2
Apria Systems, Parque Empresarial de Morero, Parcela P.2-12, Nave 1-Puerta 5, 39611 Guarnizo, Spain
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(12), 444; https://doi.org/10.3390/membranes10120444
Received: 20 November 2020 / Revised: 14 December 2020 / Accepted: 18 December 2020 / Published: 21 December 2020
(This article belongs to the Special Issue Membrane Technologies for Resource Recovery)
Zinc recovery from spent pickling acids (SPAs) can play an important role in achieving a circular economy in the galvanizing industry. This work evaluates the scale-up of membrane-based solvent extraction technology aimed at the selective separation of zinc from industrial SPAs as a purification step prior to zinc electrowinning (EW). The experiments were carried out at a pilot scale treating SPAs batches of 57 to 91 L in a non-dispersive solvent extraction (NDSX) configuration that simultaneously performed the extraction and backextraction steps. The pilot plant was equipped with four hollow fiber contactors and 80 m2 of total membrane area, which was approximately 30 times higher than previous bench-scale studies. Tributylphosphate diluted in Shellsol D70 and tap water were used as organic and stripping agents, respectively. Starting with SPAs with high Zn (71.7 ± 4.3 g·L−1) and Fe (82.9 ± 5.0 g·L−1) content, the NDSX process achieved a stripping phase with 55.7 g Zn·L−1 and only 3.2 g Fe·L−1. Other minor metals were not transferred, providing the purified zinc stripping with better quality for the next EW step. A series of five consecutive pilot-scale experiments showed the reproducibility of results, which is an indicator of the stability of the organic extractant and its adequate regeneration in the NDSX operation. Zinc mass transfer fluxes were successfully correlated to zinc concentration in the feed SPA phase, together with data extracted from previous laboratory-scale experiments, allowing us to obtain the design parameter that will enable the leap to the industrial scale. Therefore, the results herein presented demonstrate the NDSX technology in an industrially relevant environment equivalent to TRL 6, which is an essential progress to increase zinc metal resources in the galvanizing sector. View Full-Text
Keywords: hot-dip galvanizing; zinc recovery; spent pickling acid; hollow-fiber membrane contactor; pilot plant; non-dispersive solvent extraction; tributyl phosphate; secondary zinc hot-dip galvanizing; zinc recovery; spent pickling acid; hollow-fiber membrane contactor; pilot plant; non-dispersive solvent extraction; tributyl phosphate; secondary zinc
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MDPI and ACS Style

Arguillarena, A.; Margallo, M.; Arruti-Fernández, A.; Pinedo, J.; Gómez, P.; Urtiaga, A. Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing. Membranes 2020, 10, 444. https://doi.org/10.3390/membranes10120444

AMA Style

Arguillarena A, Margallo M, Arruti-Fernández A, Pinedo J, Gómez P, Urtiaga A. Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing. Membranes. 2020; 10(12):444. https://doi.org/10.3390/membranes10120444

Chicago/Turabian Style

Arguillarena, Andrea, María Margallo, Axel Arruti-Fernández, Javier Pinedo, Pedro Gómez, and Ane Urtiaga. 2020. "Scale-Up of Membrane-Based Zinc Recovery from Spent Pickling Acids of Hot-Dip Galvanizing" Membranes 10, no. 12: 444. https://doi.org/10.3390/membranes10120444

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