Vliv struskových režimů na energetickou bilanci a zvýšení životnosti žárovzdorné vyzdívky EOP při výrobě středně a vysoce legovaných ocelí

Abstract

Offered dissertation paper outlines important part of wide range of issues related to the production of steels for special use. This applies in particular for construction steel, steel used in technological units for water, wind and nuclear energy and etc. It focuses on the production of liquid steel in the electric arc furnace, which is the primary part of the manufacturing process. From the point of total costs, melting is the most demanding part in whole steelmaking process. Therefore, in the last 10 years, strong emphasis was laid on the extensive research of the melting process management. Through the introduction of new technologies strong costs reduction has been achieved. In fact, additional chemical energy, introduced through the sophisticated system of wall burners implemented into the furnace side wall, became employed. Additionally, new kind of energy, amended into the furnace, brought significant change in the slag composition, which influenced the entire melting procedure, significantly. Consequently, such a key phenomenon became the main object of presented dissertation paper, including the related positive effects. Using comparative methods liquid/foamy slag steelmaking technologies were compared. As concluded, practical part quantifies the benefits of foaming and briefly explains the slag corrosion mechanisms of slag line furnace masonry. Achieved results contribute, wieved from the micro scale, to deeper knowledge of the slag layer physical-chemical properties and related refractory wear. 5 / 171 Associated, wieved from the micro scale, foamy slag technology brought significant reductions of direct economic costs in primary production of special steels. Outlining the interconnections between the running process mechanisms and their measured outstanding consequences became the informal goal of the dissertation paper.