10 Graphite electrodes - Manufacture of graphite electrodes...

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1 Manufacture of graphite electrodes Making of graphite 1. Coke piles 2. Rotary drier 3. Rolling mill crusher 4. Screen 5. Flour rolling mill 6. Weighing 7. Pitch 2 8. Mixer 9. Extrusion press 10. Cooling tank 11. Baking furnace 12. Pitch impregnation 13. Graphitising furnace 14. Machining 15. Delivery at UCAR / EMSA, South Africa Graphite Electrodes manufacturing is very energy intensive process. Graphite is formed when pre- baked carbon is heated to approximately 2800 °C. 3 Graphitising of electrodes is usually carried out in Acheson or Castner furnaces. The individual steps of the operation are addressed in the following slides. Material preparation Raw materials are 75% coke (low S), 18% pitch, and ‘others’ Coke is dried, crushed, and screened Particle sizes range from 75 μ m to 12 mm; the fine 4 m to 12 mm; the fine ‘flour’ is used for high-strength threaded connecting pins The coke particles are mixed with pitch in controlled proportion and extruded to make green electrodes.
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