No abstract

The article analyzes the work of the oxygen-converter shop of PJSC «ArcelorMittal Kryvyi Rih». It is shown that almost half of the total number of blowing supplements (~ 44%) is carried out by temperature. In order to improve the conditions of steel smelting and reduce resource costs, calculations were performed and new technological solutions were found in steel smelting to reduce the number of additives. The study of real smelters demonstrated the need for corrective operations in the smelting of steel using scrap metal of different types. Scrap smelts have a clear relationship between the amount of scrap in the charge and the temperature of the melt in the first dump. The addition of «goat» scrap to the charge has a number of uncontrolled effects on the process due to significant fluctuations in the chemical composition of this type of metal charge. An economic analysis with introducing the developed control mechanism over the course of steel smelting into the software system for conditions PSJC «ArcelorMittal Kryvyi Rih» was performed.

Based on the analysis of the circumstances of formation, collection and transportation of significant sludge volumes to the place of their storage, the possibility of a significant reduction in the tailings areas as well as infiltration of sludge deep into the soils and their pollution with inorganic substances is considered. The methodology is based on the analysis of the physics of the process of stable sludge separation into a solid and liquid component as well as the activation of the sedimentation process of particles contained in the slurry suspension both in its static state (when stored in sludge storages) and during the movement of sludge from the place of formation to the storage place. The regularities for calculating solid phase sedimentation rate both in statics and motion on the basis of influence of initial solids concentration and dynamic water viscosity on sedimentation have been obtained and proved. The scientific novelty of the work lies in the fact that a formula for determining the dependence of the deposition rate on the hydrodynamic conjugation of particle motion in the direction transverse to the fluid flow depending on the type of flow determined by the Reynolds number has been found. The practical value consists in defining the sludge solid phase deposition rate in statics and dynamics as a result of influence of solids concentration and dynamic water viscosity.