METHOD OF ADJUSTMENT OF ELECTRICAL MELTING OF IN ELECTRIC ARC FURNACE Russian patent published in 2015 - IPC C21C5/52 F27B3/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to the electric furnaces with graphite electrodes immersed in melted slag, the electrodes have axial holes, through which to zone of electric arcs the iron-ore iron-rich pellets are supplied, they are melted with afterburning of carbon oxide by oxygen supplied from nozzles of the water cooled lance to space between electrodes above slag, and additional heating of the slag-metal bath. Heat power of slag-metal bath is determined by equation Δq_B = Q_B/τ+(Q_ex+Q_CO+Q_F), where Q_B is power consumption for melting, kWh/t; Q_CO, Q_F, Q_ex are heat input from CO aftercooling, fuel and exothermal reaction in furnace, kW, and current rate of metal heating (V_t, °C/s), current consumption of iron-ore iron-rich pellets (V_pel, kg/s) depending on heat power of slag-metal bath is (Δq_B, kW), and current rate of metal heating in it (V_t, °C/s) keeping equality of this value of optimal required rate of metal heating (V_t(opt), °C/s).

EFFECT: invention increases efficiency of iron-ore iron-rich pellets melting, reduces power consumption, increases the furnace capacity, and reduces energy consumption of the production.

3 cl, 3 dwg