Graphite electrode Details

              Graphite Electrode

   Graphite Electrode, mainly made of petroleum coke and Needle Coke, coal tar pitch as binder, is prepared by calcination, compounding, kneading, pressing, roasting, graphitization and machining, and is released in the form of electric arc in electric arc furnace. The conductor for heating and melting the electric charge has the characteristics of low electrical resistivity, good electrical conductivity, low ash content, uniform structure, good oxidation resistance and high mechanical strength.

 

Graphite Electrode classification
Image	classification	Index
	普通功率石墨电极 Regular Power Graphite Electrode	It is allowed to use Graphite Electrodes with current density lower than 17A/cm2, which are mainly used in ordinary power electric furnaces such as steel making, silicon refining, and yellowing phosphorus.
	高功率石墨电极      High Power Graphite Electrodes	Graphite Electrodes with a current density of 18 to 25 A/cm 2 are allowed, and are mainly used in high-power electric arc furnaces for steel making.
	超高功率石墨电极    Ultra High Power Graphite Electrodes	Allows the use of Graphite Electrodes with a current density greater than 25 A/cm, mainly for ultra high power steelmaking electric arc furnaces

 

     First, used in electric arc steel furnace

     Graphite Electrodes are mainly used in electric furnace steelmaking. Electric furnace steelmaking uses a Graphite Electrode to introduce a current into the furnace. A strong current generates an arc discharge through the gas at the lower end of the electrode, and the heat generated by the arc is used for smelting. According to the size of the electric furnace, Graphite Electrodes of different diameters are used. In order to continuously use the electrodes, the electrodes are connected by electrode joints. The Graphite Electrode for steelmaking accounts for about 70-80% of the total amount of Graphite Electrode.

     Second, for the mine electric furnace

     The feature is that the lower part of the conductive electrode is buried in the charge, so that in addition to the heat generated by the arc between the electric plate and the charge, the electric charge is generated by the resistance of the charge when the electric current passes through the charge.

     Third, for the resistance furnace

     The graphitization furnace for producing graphite products, the melting furnace for melting glass, and the electric furnace for producing silicon carbide are all electric resistance furnaces, and the materials contained in the furnace are both heating resistors and objects to be heated. Usually, the Graphite Electrode for electricity conduction is inserted into the furnace wall at the end of the hearth, so that the conductive electrode is not continuously consumed.

 

1. Damp Graphite Electrodes should be dried before use.

2. Remove the foam protective cap on the spare Graphite Electrode hole and check if the internal thread of the electrode hole is complete.

3. Clean the surface of the spare Graphite Electrode and the internal thread of the hole with compressed air without oil and water; avoid cleaning with steel wire or metal brush.

4. Carefully screw the joint into the electrode hole of the end of the spare Graphite Electrode (it is not recommended to directly insert the joint into the electrode removed from the furnace). Do not hit the thread.

5. Screw the electrode spreader (a graphite spreader is recommended) into the electrode hole at the other end of the backup electrode.

6. When lifting the electrode, pad the soft material to the bottom of the spare electrode connector to prevent the ground from damaging the joint; use the hook to extend into the lifting ring of the spreader, and lift the lifting electrode to prevent the electrode from being loosened by the B end. Take off or collide with other fixtures.

7. Hang the spare electrode above the electrode to be connected, align it with the electrode hole and then slowly drop it; rotate the spare electrode to make the screw hook rotate down with the electrode; when the two electrode end faces are 10-20mm apart, use compressed air again. Clean both ends of the electrode and the exposed part of the joint; do not over-exact when the electrode is fully lowered at the end, otherwise the electrode hole and the thread of the joint may be damaged due to a violent collision.

8. Screw the spare electrode with a torque wrench until the end faces of the two electrodes are in close contact (the correct connection between the electrode and the joint is less than 0.05 mm).

 

Ordinary power Graphite Electrode:

1. Diameter 100-350mm, specific resistance 6-9μΩm, flexural strength 10-12Mpa, elastic modulus 7-9Gpa, thermal expansion coefficient 1.8-2.9 X 10-6/°C, compressive strength 18-22 Mpa, bulk density 1.52 -1.57G/CM3, ash 0.3%.

2. Diameter 400-500mm, specific resistance 7-10μΩm, flexural strength 6.5-10Mpa, elastic modulus 7-9.3Gpa, thermal expansion coefficient 1.7-2.9 X 10-6/°C, compressive strength 18-22 Mpa, bulk density 1.52-1.57G/CM3, ash 0.3%.

High power Graphite Electrode:

1. Diameter 200-350mm, specific resistance 6-7μΩm, flexural strength 10-15Mpa, elastic modulus 9-12Gpa, thermal expansion coefficient 1.6-2.2 X 10-6/°C, compressive strength 24-28 Mpa, bulk density 1.62 -1.70G/CM3, ash 0.3%.

2. Diameter 400-500mm, specific resistance 6-7μΩm, flexural strength 10-13Mpa, elastic modulus 9-12Gpa, thermal expansion coefficient 1.5-2.2 X 10-6/°C, compressive strength 24-26 Mpa, bulk density 1.62 -1.68G/CM3, ash 0.3%.

Electrode joint: diameter 200-500mm, specific resistance 4-7μΩm, flexural strength 12-20Mpa, elastic modulus 12-14Gpa, thermal expansion coefficient 2.0-3.0 X 10-6/°C, compressive strength 32-38 Mpa, bulk density 1.70-1.80G/CM3, ash 0.3%. 

 Antioxidant coated Graphite Electrode

  A Graphite Electrode coated with an anti-oxidation protective layer (Graphite Electrode antioxidant). Forming a protective layer that is both conductive and resistant to high temperature oxidation, reduces electrode consumption during steelmaking (19% to 50%), extends electrode life (22% to 60%), and reduces electrode power consumption.

 

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