2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 4: Recycling & Secondary Battery
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 498 pages |
| ISBN: | 978-1-987820-06-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Leaching of zinc, iron and calcium from EAF dust in sulfuric acid
Tomas Havlik1; Ludovit Parilak2;1TECHNICAL UNIVERSITY OF KOSICE, FACULTY OF METALLURGY,, Kosice, Slovakia (Slovak Republic); 2ZP VVC S.R.O., PODBREZOVA, Slovakia (Slovak Republic);
Type of Paper: Regular
Id Paper: 47
Topic: 5
Abstract:
This work deals with the possibility of hydrometallurgical treatment electric arc furnace (EAF) dust using dilute sulphuric acid solutions. The origin of the EAF dust sample was Ironworks Podbrezova, Slovakia. Zinc content in the dust was 17.05 % and zinc was present both as zincite ZnO and zinc ferrite ZnFe2O4. The effect of temperature, acid concentration and leaching time on zinc, iron and calcium extraction into the solution was investigated. The leaching experiments were carried out at the temperatures of 20, 40, 60, 80 and 95°C in aqueous solutions of sulphuric acid with concentrations of 0.05, 0.1, 0.25, 0.5 and 1 M. The liquid to solid ratio (L:S) was equal to 50. The maximum zinc extraction of 95 % was achieved in 1 M H2SO4 at 80°C after 90 minutes of leaching, while the iron extraction under the same conditions was 66 %. The main objective of this study was to find out conditions at which the maximum amount of zinc passes into the solution while iron remains in the solid residue. The following conditions were specified as optimum: 0.1 M H 2S0 4, 60°C. The zinc extraction under the given conditions was 65 %, while iron extraction was around 5 %.