Chmyrkov K. Improvement of steelmaking technology in small volume BOF while using silicon carbide containing HBI

The dissertation is enlightening actual scientific and technical problem of reducing liquid pig iron specific consumption for 1 ton of BOF steel due to silicon carbide containing HBI. For the first time by determining the thermal characteristics of silicon carbide containing HBI it is proved that thermal conductivity coefficient, which changes with increasing temperature, for the test sample preform containing 50% slurry of carbide is not expressed to a significant change trend that provides uniform heating of the briquette during melting in BOF. For the first time on the basis of mathematical modeling results the temperature fields in the body of silicon carbide containing HBI were determined taking into account the change of its components in the process of interaction with liquid metallurgical melts. During dissertation work were developed theoretical ideas regarding dissolution mechanism of briquettes in a metal and molten slag. Using the method of similarly available diffusion surface, method of chemical, petrographic and X-ray-phase analysis, including the boundary layer of silicon carbide containing HBI with an appropriate metal melt , it is found that: - In iron-carbon melt process is determined by diffusion of silicon and carbon in the metal is possible after the destruction of SiO2 film on the surface of silicon carbide due to thermal shock ; - In the melted slag process is determined by chemical reaction of formation of low-melting SiO2 compounds with film with the components of the primary converter slag and its subsequent transfer to the amount of molten slag. Using a set of briquettes dissolution mechanism the fundamentals of silicon carbide containing HBI applications were developed.