RUNNING OF ELECTROSMELTING INITIAL STAGE IN DC ARC FURNACE Russian patent published in 2014 - IPC F27B3/08 C22B9/20 

FIELD: metallurgy.

SUBSTANCE: proposed process comprises loading the charge in furnace and switching on of furnace power supply. Graphitised electrode is displaced downward to contact with charge by its working end. Arc is fired to feed current via closed electric circuit including said graphitised electrode, electrode gap, charge, at least one hearth electrode with current lead wires and power supply. Note here that current is controlled as well as maximum voltage at power supply output terminals and arc is controlled and optimised by variation of arc length after maximum voltage is reached thereat. Smelting initial stage is terminated after termination of well penetration in the charge. During the entire stage of initial smelting, current density in graphitised electrode does not exceed 20 A/cm² while electrode working end is displaced deep down the well unless the completion of well penetration in the charge.

EFFECT: lower costs of smelting process.

2 dwg, 1 ex