WET MAGNETIC SEPARATION OF IRON FROM FINE-GRAINED STEELMAKING SLAGS

1 FONIOK Kryštof
Co-authors:
1 MATĚJKA Vlastimil 2 MAIEROVÁ Petra 3 MATĚJKOVÁ Petra 2 VLČEK Jozef
Institutions:
1 VŠB - Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Chemistry, Ostrava, Czech Republic, EU
2 VŠB - Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Thermal Engineering, Ostrava, Czech Republic, EU
3 VŠB - Technical University of Ostrava, Centre for Advanced Innovation Technologies, Ostrava, Czech Republic, EU, krystof.foniok@vsb.cz
Conference:
31st International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 18 - 19, 2022
Proceedings:
Proceedings 31st International Conference on Metallurgy and Materials
Pages:
85-90
ISBN:
978-80-88365-06-8
ISSN:
2694-9296
Published:
30th June 2022
Proceedings of the conference have been sent to Web of Science and Scopus for evaluation and potential indexing.
Metrics:
31 views / 14 downloads
Abstract

Large volumes of slags are formed as by-products during the refinement of pig iron and steel manufacturing. Generally, the steel slag (steel furnace and ladle furnace slags) contains an appreciable amount of magnetic substances such as metallic iron and magnetic iron oxide, and thus, they can be recycled by wet magnetic separation. This work presented here investigates the effect of fine grinding for maximum recovery of iron from the steel furnace slags. Three kinds of slags, namely furnace steel slag (FS) containing 30 wt. % of Fe2O3, ladle slag (LS) containing approx. 16 wt. % and slag from desulfurization process (DeS) containing approx. 35 wt. % of Fe2O3, were crushed, grounded and sieved under 0.045 mm for wet magnetic separation experiments. Results showed that the proposed magnetic separation process allowed to isolate 24, 18 and 42 wt. % of magnetic fractions for FS, LS and DeS, respectively. The content of Fe2O3 in magnetic fractions increased from 30 to 48 wt. %, from 16 to 46 wt. %, and from 35 to 44 wt. % of Fe2O3 in the case of the FS, LS and DeS, respectively. The fractions obtained by wet magnetic separation process were subjected to the chemical and phase analysis, the morphology of the particles was studied using scanning electron microscopy.

Keywords: Metallurgical slags, wet magnetic separation, iron recovery, Fine-grained slags

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