Abstract
Abstract Production cost reduction for the Electric Arc Furnace (EAF) technology is strongly dependent on the efficiency of the electrical energy being introduced into the metal bath. Besides EAF technology, the slag foaming process is currently applied to some other equipment for steel production aiming to save energy, productivity improvements, enhance the refractory service life and inhibit steel re-oxidation. In this way, this study involved the recycling options of Crushed MgO-C spent refractories removed from the EAF without complex and costly beneficiation, with emphasis on its application as a slag conditioner, since its composition presents high MgO content. The experiments were performed in a laboratory induction furnace and the temperature was controlled at 1700°C.The initial height of the slag was recorded and foaming briquettes added into the furnace. The experiments were carried out for 30 minutes. When the foaming process was finalized, an aliquot from the slag was collected to be analyzed by chemical analysis. Then, the metal with slag was tapped into a mold. The results indicated that the best viscosity was 0.39poise. The maximum height of foam formation was observed for a binary basicity greater than 1.2. The concentration of MgO in the slag is close to the saturation point.
Highlights
The worldwide increase of steelmaking by electric arc furnaces (EAF) has impacted directly on steel production (World Steel Association, 2011)
It is observed that from the formulation B4 (∆hB4 = 5.5 cm), the calculated viscosity was 0.392 poise, this value being greater than that obtained in formulation B06, which in turn had a lower foaming level than formulation B06 (∆hB6 = 5.0 cm)
For the dead burned dolomite fines,42%wt of MgO was found, illustrating that this material can be applied as an MgO source
Summary
The worldwide increase of steelmaking by electric arc furnaces (EAF) has impacted directly on steel production (World Steel Association, 2011). This increase has led the steel sector to search and develop a new production pattern with higher efficiency at lower costs. In this scenario, the production of steel with an electric arc furnace (EAF) process has undergone a variety of modifications in order to cope with the current market demands. HARA (1997), among these changes, the increase of the useful life of refractory materials, reduction of material costs and the increase of operational safety in the production processes are mentioned. J.,, Ouro Preto, 71(1),, jan. mar. | 2018
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
