Selective recovery of Zn and Fe from spent pickling solutions by the combination of anion exchange and membrane electrowinning techniques

Gábor Csicsovszki, T. Kékesi, Tamás I. Török

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Although the environmental industry has developed many modern techniques to treat spent pickling liquors, including also the membrane separation, still neither of them can be applied alone for the efficient treatment of HCl containing spent pickling solutions originating from hot dip zinc galvanizing plants. In this area, the most frequently applied treatment is still the common precipitation-filtration process. However, this technique generates large amounts of hazardous waste to be deposited at high costs and does not recover the acid. Our novel approach to treat such spent liquors consists of an ion-exchange separation and a membrane electrolysis step to recover HCl, Fe and ZnCl2 as saleable products. The experimental part of this paper concentrates on the anion-exchange separation of the components in the raw liquor and the cathodic deposition of iron at varied pH, temperature and cathode materials by using potentiodynamic testing technique. As a result, a direct anion-exchange with a strongly basic resin can separate the main components (Fe and Zn) of the raw solution loaded at a moderate flow rate into the column. The recommended conditions for the electrolytic deposition of iron are pH>1 and nickel cathode.

Original languageEnglish
Pages (from-to)19-28
Number of pages10
JournalHydrometallurgy
Volume77
Issue number1-2
DOIs
Publication statusPublished - Apr 2005

Fingerprint

Electrowinning
Pickling
Anions
ion exchange
Ion exchange
Negative ions
membrane
Membranes
Recovery
Cathodes
Iron
Hazardous Waste
iron
Galvanizing
Nickel
hazardous waste
Electrolysis
Electrodeposition
Zinc
dip

Keywords

  • Anion-exchange separation
  • Cathode process
  • Hydrochloric acid
  • Polarization curves
  • Potentiodynamic examination
  • Recovery of Fe and Zn
  • Spent pickling liquor

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

Cite this

Selective recovery of Zn and Fe from spent pickling solutions by the combination of anion exchange and membrane electrowinning techniques. / Csicsovszki, Gábor; Kékesi, T.; Török, Tamás I.

In: Hydrometallurgy, Vol. 77, No. 1-2, 04.2005, p. 19-28.

Research output: Contribution to journalArticle

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