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DC Submerged ARC Furnace

Working Principle
The DC Submerged Arc Furnace (DC SAF) utilizes three top graphite electrodes and one conductive bottom electrode to establish a direct current electrical circuit.
Electrical energy supplied through the transformer and rectifier system generates highly stable arc heating and resistance heating within the burden and molten bath. This configuration provides excellent energy utilization, improved process control and reduced electrode consumption compared with conventional AC furnace technology.
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Main Technical Parameters

Parameter

Typical Range

Furnace Type

DC Submerged Arc Furnace

Furnace Capacity

3 – 120 MVA

Annual Production Capacity

5,000 – 300,000 t/year

Furnace Shell Internal Diameter

2.5 – 14.0 m

Furnace Hearth Depth

1.5 – 6.0 m

Electrode Configuration

1 Top Electrode + Bottom Electrode

Electrode Diameter

400 – 1,200 mm

Transformer Capacity

3 – 120 MVA

Rectifier Capacity

3 – 120 MW

Primary Voltage

10 / 35 / 66 kV

DC Secondary Voltage

200 – 1,500 V

DC Current

10 – 120 kA

Rectifier Type

Thyristor / IGBT

Bottom Electrode Type

Air-Cooled / Water-Cooled

Electrode Regulation System

Hydraulic Servo

Burden Type

Ore + Reductant + Flux

Raw Materials

Chromite, Nickel Ore, Titanium Slag Feed, Copper Slag, Metallurgical Residues

Operating Temperature

1,400 – 1,800 ℃

Cooling Water Flow Rate

30 – 600 m³/h

Cooling Water Pressure

0.3 – 0.8 MPa

Specific Energy Consumption

Process Dependent

Off-Gas Temperature

300 – 1,200 ℃

Process Control

PLC / SCADA

Environmental System

Fully Closed Furnace Available


Typical Furnace Sizes

Transformer Capacity

Shell Diameter

3 MVA

2.5 – 3.0 m

6 MVA

3.5 – 4.0 m

12 MVA

4.5 – 5.5 m

24 MVA

6.0 – 7.5 m

48 MVA

8.0 – 10.0 m

72 MVA

10.0 – 12.0 m

120 MVA

12.0 – 14.0 m


DC SAF power supply

Typical Products

· Ferrochrome (FeCr)

· Ferronickel (FeNi)

· Titanium Slag

· Copper Matte

· Crude Copper

· Nickel Matte

· Recovered Metals

· Recycling Products

Scope of Supply

Mechanical Equipment

· Furnace Shell

· Furnace Roof

· Electrode Column

· Bottom Electrode System

· Furnace Tilting System

· Tapping System

Electrical Equipment

· Furnace Transformer

· Rectifier Transformer

· Rectifier Unit

· DC Short Network

· Copper Busbars

· Electrode Regulation System

· PLC & SCADA System

Auxiliary Systems

· Water Cooling System

· Fume Extraction System

· Hydraulic System

· Spare Parts Package

Key Advantages of DC SAF Technology

✓ Lower Electrode Consumption

✓ Higher Energy Efficiency

✓ Improved Metal Recovery

✓ Stable Arc Operation

✓ Reduced Network Flicker

✓ Lower Operating Cost

✓ Better Process Control

✓ Suitable for Large-Scale Smelting Operations


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