Graphite electrodes are mainly made of petroleum coke and needle coke
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Graphite electrodes are mainly made of petroleum coke and needle coke, with coal tar as a binder. They are made through calcination, batching, kneading, pressing, roasting, graphitization, and machining. They are conductors that release electric energy in the form of an arc in an electric arc furnace to heat and melt the charge. According to their quality indicators, they can be divided into ordinary power graphite electrodes, high power graphite electrodes, and ultra-high power graphite electrodes.
| Item | Unit | RP | HP | UHP | ||||
| 250-400 | 450-800 | 300-400 | 450-700 | 300-400 | 450-700 | |||
| Electric Resistivity | Electrode | μΩ.m | 7.5-8.6 | 7.5-8.8 | 5.5-6.8 | 5.5-7.0 | 4.6-6.0 | 4.8-6.2 |
| Nipple | 4.5-5.5 | 4.0-5.0 | 3.5-4.5 | |||||
| Bending Strength | Electrode | Mpa | ≥8.0 | ≥11.0 | ≥11.0 | |||
| Nipple | ≥15.0 | ≥16.0 | ≥18.0 | |||||
| Elastic Modulus | Electrode | Gpa | ≤9.0 | ≤11.0 | ≤13.0 | |||
| Nipple | ≤13.0 | ≤14.0 | ≤15.0 | |||||
| Bulk Density | Electrode | g/cm3 | 1.55-1.65 | 1.63-1.73 | 1.65-1.75 | |||
| Nipple | 1.70-1.75 | 1.73-1.80 | 1.75-1.82 | |||||
| Ash | Electrode | % | ≤0.3 | |||||
| Nipple | ||||||||
| CTE(100-600)ºC | Electrode | 10-6/ºC | 2.00-2.50 | 1.80-2.00 | 1.30-1.50 | |||
| Nipple | 1.50-1.80 | 1.50-1.80 | 1.20-1.40 | |||||
The main raw material for graphite electrode production is petroleum coke. A small amount of asphalt coke can be added to ordinary power graphite electrodes. The sulfur content of petroleum coke and asphalt coke cannot exceed 0.5%. Needle coke is also required when producing high power or ultra-high power graphite electrodes. The main raw material for aluminum anode production is petroleum coke, and the sulfur content is controlled to be no more than 1.5% to 2%. Petroleum coke and asphalt coke should meet the relevant national quality standards.
