Journal
JOURNAL OF CLEANER PRODUCTION
Volume 164, Issue -, Pages 265-276Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.06.212
Keywords
EAF dust; Zinc; Iron; Leaching; Selectivity; Recycling
Categories
Funding
- Association of Finnish Steel and Metal Producers
- RawMatTERS Finland Infrastructure (RAMI) at Aalto University
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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. (C) 2017 Elsevier Ltd. All rights reserved.
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