Methods for choosing a rational composition of the blast furnace charge

Abstract

The aim of the work is to solve the problem of choosing the optimal composition of iron ore materials for blast furnace loading. An analytical review of the existing approaches to assessing the quality and methods for selecting a rational composition of iron ore materials implemented as part of the control system of domestic and foreign blast furnaces in modern conditions has been carried out. A method of modeling the processes of directional formation of melts, developed at the Iron and Steel Institute, is proposed. The description of the processes of transformation of iron ore materials in a blast furnace and the properties of liquid smelting products was carried out using the parameters of interatomic interaction in melts. The technique uses a set of integral criteria and physicochemical models that allow estimating charge, gas-dynamic and temperature melting conditions. The influence of the quality of iron ore on the properties of primary melts and final products of blast-smelting is analyzed. An integral indicator of the quality of the charge and an integral indicator of the temperature blast mode have been developed. The main difference of the proposed approach to the selection of the composition of the charge from similar developments focused on the traditional criterion «basicity of the final slag» is the use of a set of physico-chemical criteria that characterize the quality and properties of iron ore, primary and final blast furnace slag. The use of the developed prognostic models and criteria as part of automated blast furnace control systems allows us to predict the chemical composition of iron and slag. Stabilization of slag properties within the specified limits ensures the smelting of cast iron of the required composition and a reduction in coke consumption in the current unstable conditions of smelting iron.