Melnyk S. Researches of physical - chemical features and development of polyreagent processes of ladle treatment of metal of converter steel of the improved quality.

Dissertation is devoted to the ground of theoretical positions and development of technological processes of ladle treatment of metal at the decision of the issue of the day of steelmaking the improved quality in heavy converters. The results of theoretical and experimental researches of physical and chemical processes, got at development of converters steels with treatment ladles by the capacity of 350т, for the decision of the issue of the day of increase of competitiveness and resources saving of steels in connection with going into the international markets of metal, are presented in dissertation. In-process through the methods of thermodynamics analysis, mathematical design laboratory and industrial experiment, conformities to the law of processes of affinage of metal are studied from S, P, НВ, microalloyings became, retrofittings of Са and Ва, affinages by synthetic slags (SS), slag mixtures, vacuumizing, treatments by liquid ligatures, adjustments of chemical composition became on C, Mn, Si, Al and other. The methods of estimation of ladle affinage are developed became the homogeneous active slags of the base system CaO-Al2O3-SiO2 with the use of optical basicity of slags of ? and their sulfide capacity CS. It is set that activity of ion of oxygen in slags and sulfide capacity of slags C(S) can serve as descriptions of structure of metallur-gical fusions and to reflect their refining ability. The results of research of affinage and retrofitting are resulted SS, slag mixtures, SiCa became and other. It maded estimation of efficiency of affinage became from inclusions by the different ways of ladle treatment. On the basis of theoretical researches and experiment of the technological resources saving processes of production of high-quality steels in heavy converters with the use of ladle treatment of metal, allowing to pass the certification by leading international qualifying societies and to go out to the world markets of metals, are developed.