MECHANISM OF METAL DECARBURIZATION AND FORMATION OF CARBON OXIDE IN AN ARC FURNACE

Abstract

The paper presents a mathematical model of decarburization process with continuous supply of pellets and using fuel-oxygen burners subject to changes of slag oxidation and oxygen distribution on the of melt components oxidation during the melting. The algorithm and program of the proposed model can be used to calculate the controlled oxidative refining at electric melting of metalized pellets in an arc furnace bath. The article considers calculated by the model curves of the process components of metal decarburization, slag oxidation and the rate of steel heating from decarburization during the period of steel melting to achievement of the final metal weight in the bath of 150-t EAF at different consumption of pellets and constant supply of oxygen by fuel-oxygen burners at the melting. The data confirm the decisive contribution of oxygen from fuel-oxygen burners in the melt decarburization. General view of the curves of changes of the decarburization process components coincides with the literature and experimental data. This makes it possible to exercise effective control of electric parameters of electric melting (with electrodes current, voltage steps, etc.), providing maximum radiation of electric arcs on the surface of metal and slag. Thus, the oxygen flow through the fuel-oxygen burner allows to realize technical solutions for the electric melting of pellets in high temperature zone of the furnace. The flow of pellets, granular materials and gas mixtures are concentrated in the influence zone of electric arcs on the surface of the melt, where the processes of heating and melting of pellets are made with higher speeds than all the blown methods of loading of metalized pellets into the unit, allowing you to achieve higher technical, economic and energy-technological parameters of metallized pellets melting.