Basic Definition
Calcined Petroleum Coke (CPC): A carbon material produced by calcining raw petroleum coke (a by-product of oil refining) at high temperatures (1,200–1,350°C) to remove volatiles, moisture, and impurities.
Recarburizer: An additive used in steelmaking/foundry processes to replenish carbon (C) in molten metal (iron/steel).
CPC Recarburizer: A carbon additive with CPC as the core material (C >98%), essential for casting and specialty steel production.
Production Process
Calcination Objectives:
Volatiles reduced from 8-12% to <0.5%
Partial sulfur removal (residual S: 0.5-3%)
Fixed carbon increased from 80-85% to >98%
True density increased from 1.3 g/cm³ to 2.05-2.15 g/cm³
Key Performance Indicators
| Parameter | Typical Range | Impact |
|---|---|---|
| Fixed Carbon (FC) | 98.5-99.5% | Core carbon contribution |
| Sulfur (S) | 0.3-3.0% | Determines steel applicability (low-S steel requires ≤0.5%) |
| Ash Content | 0.2-0.8% | Affects metal purity |
| Volatiles (VM) | ≤0.5% | Excessive VM causes splashing |
| Nitrogen (N) | 200-500 ppm | Premium steels require ≤300 ppm |
| True Density | 2.05-2.15 g/cm³ | Higher density improves carbon absorption |
| Particle Size | 1-5mm (Foundry) 0.5-3mm (Steel) |
Optimizes dissolution rate |
Metallurgical Mechanisms
Rapid Carbon Dissolution:
CPC dissolves 15-30% faster than graphite recarburizers due to high carbon density and low impurities.
Stabilizes Carbon Equivalent (CE):
Compensates for carbon loss in casting (e.g., 10-15% carbon burnout in cupola furnaces).
Enhances Material Properties:
Increases cast iron strength (HT250 → HT350)
Promotes nodular graphite formation (>90% nodularity)
Reduces casting shrinkage defects
|
Type |
Chemical composition(%) |
|||
|
FC |
S |
Ash |
Moisture+V.M |
|
|
≥ |
≤ |
|||
|
CPC-01 |
98.5 |
0.5 |
0.5 |
1.5 |
|
CPC-02 |
98.5 |
0.7 |
0.7 |
1.5 |
|
Packing ：In 1MT big bag or as request |
||||
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