Skachko O. Development of physical-chemical criteria and models for scientifically grounded forecasting and directed formation of the composition and properties of blast furnace smelting products

The dissertation was solved the actual problem of development of physical and chemical criteria and models for assess the processes of distribution elements of the charge between the products of blast furnace smelting, with the aim of directional formation of the chemical composition and properties of pig iron and slag in the changing raw materials and process conditions. Was developed integral indicator of blast charge Kc, based the research of the effect of composition and properties of the charge materials in the processes of blast furnace smelting, and which has the highest informativity, because it describes aggregate and phase transformation of raw materials into the furnace, strength properties and high-temperature properties of the charge and, therefore, directed distribution of charge elements in the system "pig iron-slag". The estimation of influence of technological parameters has been performed (temperature, length of the tuyere zone, the theoretical combustion temperature) on the course of the blast furnace process. Was received an integral indicator of the temperature-blowing regime Ktb including temperature index furnace TIF, degree of use of gas EtaCO and the length of the tuyere zone Ltz, reflecting the thermal state in blast furnace hearth. Was developed new analytical according to predict the distribution coefficients of the elements of charge between the iron and slag, which is based on the integrated indicators of charge and temperature-blowing regime. Was established the regularities of the agreed change of integral parameters of pig iron and slag compositions, realized in the form of analytical dependence ZY=f(r, De, Ttz,), where Ttz is the temperature indicator of the tuyere zone of the furnace. Dependence that has been found characterizes the condition and the degree of concordance of chemical compositions of melts in the hearth of a blast furnace and is recommended for use in evaluation completeness process of distribution of elements in system "pig iron-slag" and also for checking the adequacy of predictive models of distribution coefficients of elements of the charge. Were further developed the algorithmic tools for predicting the structure and properties of blast furnace smelting products in the system "Outlook" of the computer system "Charge". The developed algorithms and models have been tested on the current data on the number of blast furnaces in a variety of raw materials and process conditions. "Outlook " computer system was transferred to the engineering services for use in PJSC "ArcelorMittal Kryvyi Rih". Introduced in production. Iron and steel industry.