Calculation of thermodynamic functions during agglomeration of heterogeneous charge components

Abstract

The agglomerate, as a raw material of blast furnace melting, must have such a set of properties that meets the requirements of the blast furnace process to the maximum extent. The quality of agglomerates is assessed by chemical composition, mechanical and physico-chemical properties A high-quality iron ore raw material for blast furnace melting is considered to be an agglomerate with a high iron content with a minimum content of harmful impurities, uniform in size with a minimum content of classes of more than 40 and less than 5 mm, a narrow range of softening and melting temperatures, having high reducibility and high strength. With the condition of the process of reducibility of dissimilar iron ore materials during agglomeration, it is necessary to consider the basic physico-chemical processes and thermodynamic conditions. The article describes the results of thermodynamic modeling of iron ore materials during the agglomeration process using the HSC Chemistry 5.10 program. Calculations are performed by the Reaction Equation subprogram. During the simulation, zonal technological processes of agglomeration of iron ore components of the charge are taken into account, since each zone corresponds to a certain phase formation due to physico-chemical processes corresponding to their temperature intervals. It is known, as a result implementing all the basic physico-chemical processes of agglomeration of iron ore materials; they should positively affect the quality of the resulting product. As a result, thermodynamic functions were determined in the temperature range of 25-1500°C for chemical reactions occurring in various zones of iron ore materials during the agglomeration process.