METHOD FOR STEEL MAKING IN ELECTRIC-ARC FURNACE AND ELECTRIC-ARC FURNACE Russian patent published in 2015 - IPC C21C5/52 F27B3/08 F27B3/18 

FIELD: metallurgy.

SUBSTANCE: as per the proposed method, loading of charge consisting of metal scrap and lumped oxide-carbon material is performed to a working space, electric power, fuel, a recarburising agent, flux and gaseous oxygen is supplied; heating and melting of charge is performed with electric arcs with decarburisation of a metal bath, and furnace metal and slag tapping is performed. Before the beginning of the melting process, to the central zone of the furnace, which is adjacent to the combustion zone of electric arcs and restricted with the size of not more than D=(d_p+3.5 d_el), where d_p - pitch circle diameter, d_el - electrode diameter, there loaded simultaneously with the first portion of metal charge is some part of oxide-carbon materials in the amount of 10-90% of their total consumption per melting, and the rest quantity of oxide-carbon materials is added to the molten charge in the melting direction at specific loading rate of 0.5-10 kg/min per 1 MVA of power of the transformer of the electric-arc furnace. Size of lumps of oxide-carbon materials is chosen in the range of 5-80 mm. In the furnace housing walls there are at least three inlet holes of oxide-carbon materials to the central zone of the furnace, which are spaced as to their perimeter and located below the level of the upper elevation of the furnace housing by 0.2-1.0 m.

EFFECT: invention allows reducing specific consumption of electric power for melting of metal charge and increasing iron yield out of oxide-carbon materials, as well as increasing their relative quantity in total mass of the charge.

6 cl, 2 dwg