Product

Calcined pitch coke is the thermally treated form of pitch coke, produced by calcining green pitch coke at temperatures of 1,200–1,400°C in a rotary kiln or equivalent calcination furnace in the absence of air. Calcination drives off residual volatile matter, increases real density, and develops the electrical and structural properties required for industrial carbon and graphite applications. It is the commercially dominant form of pitch coke and the product referenced in virtually all commercial specifications and safety data sheets.

Feedstock & Production

Green pitch coke — itself produced from high-temperature coal tar pitch (HT-CTP) in a delayed coker or pitch coking furnace — is fed directly into a calciner. The calcination step consolidates the carbon matrix, reduces porosity, and eliminates sulphur and nitrogen-containing volatile species. Calcined pitch coke is typically produced and consumed within integrated coal tar processing complexes or supplied to carbon electrode manufacturers.

Relationship to Calcined Petroleum Coke

Calcined pitch coke and calcined petroleum coke (CPC) serve overlapping end-use markets but differ in origin and impurity profile. Calcined pitch coke has inherently lower sulphur (<0.5 wt%) due to its coal-tar origin, eliminating the puffing risk associated with high-sulphur CPC. However, it carries higher nitrogen content and is produced in smaller volumes, making CPC the dominant anode carbon material globally.

Key Properties (Calcined)

Applications

• Carbon electrodes for aluminium smelting (anode binder or filler component)
• Graphite and carbon block production for metallurgical furnaces
• Carbon paste electrodes for calcium carbide and phosphorus production
• Recarburizer in steel-making and foundry applications
• Synthetic graphite precursor where ultra-premium needle coke is not required

References

1. Asbury Carbons. Safety Data Sheet: Calcined Pitch Coke
2. Sasol. Safety Data Sheet: Bulk Calcined Pitch Coke
3. Mitsubishi Chemical Group. Pitch Coke. Retrieved via Web Archive (Sep 7, 2025)
4. Ordabaeva A.T. et al. (Mar 2025). Production of Pitch from Coal Tar of the Coke Chemical Production "Qarmet". Molecules, 30(7), 1441. DOI: 10.3390/molecules30071441