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Graphite Electrodes from Petroleum Coke and Pitch
Graphite electrodes carry the current that melts scrap steel in electric arc furnaces. They are made from petroleum coke mixed with coal tar pitch as a binder. The paste is extruded and shaped, baked to carbonise the pitch, and then graphitised by heating to nearly 3000 °C, where the carbon atoms arrange themselves into graphite. Industrial electrodes reach 3.5 m long and 75 cm across.
Advanced
Factory process
Instructions
1
1
Mix the paste
Mix the paste
Mix petroleum coke with coal tar pitch, the binder.
Materials for this step:
Petroleum Coke1 as required
Coal Tar Pitch1 as requiredTools needed:
Carbon Paste Mixer2
2
Extrude and shape
Extrude and shape
Extrude the paste and shape it into electrodes.
Tools needed:
Carbon Paste Extrusion Press3
3
Bake
Bake
Bake the shapes to carbonise the pitch binder.
Tools needed:
Carbon Baking Furnace4
4
Graphitise
Graphitise
Heat the baked carbon to nearly 3000 °C. At that temperature the carbon atoms arrange themselves into graphite.
Tools needed:
Graphitising FurnaceMaterials
2- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
Tools Required
4- Placeholder
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