Selection of leaching media for metal dissolution from electric arc furnace dust

Petteri Halli*, Joseph Hamuyuni, Hannu Revitzer, Mari Lundström

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

This study focuses on selective zinc and lead leaching from Electric Arc Furnace (EAF) dust in order to turn this major source of steel plant pollution into a recyclable Fe-rich feed material for the steel manufacturing process. The raw material investigated comprises of engineering steel plant EAF dust that contains zinc 33.2%, iron 17.9%, manganese 2.5%, lead 1.6% and chromium 0.2%. The 16 different leaching media investigated include: (i) acids, - nitric, sulfuric, hydrochloric, aqua regia, citric, acetic, formic, phosphoric, and oxalic; (ii) alkalines - sodium potassium and ammonium hydroxide and (iii) other lixiviants like distilled water, ethanol, ethylene glycol and acetone. The study shows that four media - 10% aqua regia, 1.2 M hydrochloric, 0.94 M citric and 1.5 M nitric acids - resulted in high (>75%) zinc extraction with good Fe selectivity (iron extraction <6% in 1.2 M hydrochloric acid, 10% aqua regia and <15% with 0.94 M citric and 1.5 M nitric acids). Furthermore, these four leaching media showed partial dissolution of manganese (21–35%), chromium (36–65%) and lead (18–60%), although the highest lead removal was achieved with 1.75 M acetic acid. In terms of zinc selectivity, it was found that ammonium outperformed both sodium and potassium hydroxide.

Original languageEnglish
Pages (from-to)265-276
Number of pages12
JournalJournal of Cleaner Production
Volume164
DOIs
Publication statusPublished - 15 Oct 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • EAF dust
  • Iron
  • Leaching
  • Recycling
  • Selectivity
  • Zinc

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