The special part of the DC submerged arc furnace structure is the conductive furnace bottom and the furnace bottom anode, which are not only the melting crucible but also an input terminal of the DC power supply. The conductive furnace bottom should have good conductivity to reduce electrical energy loss; Good insulation to ensure safe production and high temperature in the reaction zone; Uniform electric distribution, so that the temperature distribution of smelting bath is relatively close; Long service life to reduce furnace shutdown maintenance and replacement manufacturing, and achieve high economic benefits. Therefore, the conductive furnace bottom and its anode technology are the key to the design of DC reduction circuits.
Compared to ac, electrode consumption saves 40-50percent，
Noise intensity decreases 7-13 bb，
Power factor rises up to 0.93-0.94，
Productivity increases by 10-15 percent.