Mining Journal of Kryvyi Rih National University

Abstract

Purpose. Currently, the processes of cast iron production in domain furnaces and pouring steel at CCM (continuous casting machine) are considered continuous. Along with the concept of “continuous process”, the phrase “combined metallurgical process” has appeared, the main sign of which is the preservation and use of high metal temperature due to the internal heat of previous complex of processes and the presence of at least two processes in the system. Research methods. Since the heat of liquid cast iron is used in the converter process to reduce the energy consumption of steel production, сonsidering the combined processes of cast iron and steel is reasonable. However, this does not allow us to consider the steel melting process continuous. Scientific novelty. The continuous process gives the best indicators with the prolonged uninterrupted operation of the unit, a partial malfunction in the operation of which disorganizes the work of the entire line. Therefore, the most important requirement is the reliability and durability of the equipment, the synchronicity of the operation of adjacent links, etc. The best for continuous processes is the dosing of the nutrition with strictly standardized raw materials and setting up the unit for the issuance of products unchanged in composition. It is necessary to coordinate these conditions with the requirements of processing a sufficient amount of raw materials and a number of steel grades production. Practical significance. This article presents the new technical scheme and equipment of continuously-combined metal production from ores and concentrates in the units of liquid-phase restoration of iron without using coke. It includes such stages as: the thermal exposure on iron ore raw materials, which are blown through the tuyeres along with coal and fluxes in the melting and reduction reactor-gasifier, to conduct iron reduction and carbonation of the metal in a coal layer; melting of carbonated iron and passing it through a layer of coal and slag; removing the slag from the melting reactor-gasifier. Results.The resulting cast iron is directed into a rotating chamber and treated with oxygen streams through the tuyere, where the decarbonization and residual deep dephosphorization of low-carbon steel takes place, which is supplied to the next rotating chamber to reduce liquid metal, after which the desulfuration to high-quality steel and alloying are conducted

Keywords:

Retrieved from Vol. 56, No. 1, 2022

Pages 168–171