METHOD FOR MELTING IN ELECTRIC ARC FURNACE AND CORRESPONDING APPARATUS Russian patent published in 2021 - IPC F27B3/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to a method for melting a metal charge. The method includes the stage of loading a charge (M) into an electric furnace, the stage of creating and maintaining an electric arc between at least one electrode and the charge (M), the stage of melting pits in the charge, wherein the electrodes are advanced through the charge (M), the stage of melting the solid charge (M) to produce molten material, and the stage of refining the resulting molten material by introducing chemically active substances, wherein at least at one of the above stages the electrical parameters of the electric arc are regulated, wherein the power source of said electric arc furnace is used to convert the alternating voltage of the electric network into a base alternating voltage and a base alternating current using at least one transformer, said base alternating voltage and base alternating current are rectified using rectifiers resulting in a constant voltage and a constant current, said constant voltage and direct current are converted using converters into a supply voltage and a supply current, and at the refining stage, the current strength (Ia) in the electric arc is raised to a second level value 1.04 to 1.2 times exceeding said first level current strength (I1), wherein the rectifiers are connected with the converters by at least one intermediate circuit operating on direct current, configured to constantly store electric energy and isolate the rectifier electrodes from the electrical network.

EFFECT: increase in the performance coefficient of the melting process, reduction in the duration of each melting cycle, increase in the operating life of the electrodes and the lining of the electric arc furnace, reduction in the expenses associated with introduction of chemicals for forming slag, and simplification of the melting apparatus are provided.

11 cl, 6 dwg, 6 tbl