REDUCTION OF CHROMIUM OXIDES FROM THE SLAG AT PRODUCTION OF ALLOYED STEELS

1 SOCHA Ladislav
Co-authors:
1 ADOLF Zdeněk 1 BAŽAN Jiří 2 MACHOVČÁK Pavel
Institutions:
1 VŠB - Technical University of Ostrava, FMME, Department of Metallurgy and Foundry, 7. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic, EU
2 VÍTKOVICE HEAVY MACHINERY a.s., Ruská 2887/101, Vítkovice, 70300 Ostrava
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
156-162
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
161 views / 36 downloads
Abstract

In the steel industry, requirements for production optimization by the help of decreasing of energy and economical demands are increasing at the production of alloyed steels in the EAF. During the treatment of alloyed steel charging in the EAF containing chromium, its loss by oxidation and by the transition into slag happens. Chromium oxidation in the EAF happens during particular technological operations, however in different intensity. The main part of chromium loss from the melting happens during the oxidation period in which oxygen is blown with the aim of ensuring of basic refining reactions and melting decarbonisation. The chromium transition and its increase in the form of chromium oxides in the slag influences its properties which is shown by the creation of slag crust with the high viscosity which decreases the slag reactivity and prevents it from creation of foam slag during production of steel in the EAF. In the presenting paper, basic possibilities of Cr2O3 reduction from the slag at using of various reduction agents, application ways and technology modification of melting are given together with the proposal of theoretical calculation of consumption of chosen refining agents presenting silicon and aluminium for the conditions of steelwork VHM a.s.

Keywords: slag mode, slag creation, slag reduction, high-alloyed steels, electric arc furnace

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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