A clean method applying anion-exchange separation and membrane-electrolysis to regenerate Fe-Zn-HCl spent pickling liquors

Gábor Csicsovszki, Tamás Kékesi, Tamás I. Törók

Research output: Contribution to conferencePaper

Abstract

We have developed a novel method - at the laboratory scale - comprising an ion-exchange separation and a membrane-electrolysis step for the purpose of zero-waste regeneration of spent HCl pickling liquors originating from hot-dip galvanizing of common steels. It is aimed at the parallel regeneration of HCl and iron. Experiments revealed that iron can be electrodeposited at high current efficiencies by maintaining the following conditions: 0.04-0.08 M HC1, 500-1000 A/m2, 20°C and stationary electrolyte in a conventional cell. Zinc in the solution did not disturb the deposition of iron, however it contaminated the product and it poisons the anion-exchange membrane required to tackle acidity during electrolysis. For a preliminary separation, anion-exchange tests were carried out to produce pure iron solutions. Beyond the equilibrium studies, column experiments were carried out showing that low flow rates of the loading solution and the ∼1.5 M HCl eluent are essential for separation.

Original languageEnglish
Pages427-436
Number of pages10
Publication statusPublished - Oct 6 2006
Event2006 TMS Annual Meeting - San Antonio, TX, United States
Duration: Mar 12 2006Mar 16 2006

Other

Other2006 TMS Annual Meeting
CountryUnited States
CitySan Antonio, TX
Period3/12/063/16/06

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Keywords

  • Anion-exchange separation
  • Hydrogen diffusion anode
  • Membrane-electrolysis
  • Spent pickling liquor

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Csicsovszki, G., Kékesi, T., & Törók, T. I. (2006). A clean method applying anion-exchange separation and membrane-electrolysis to regenerate Fe-Zn-HCl spent pickling liquors. 427-436. Paper presented at 2006 TMS Annual Meeting, San Antonio, TX, United States.