Special coke (high-carbon coke) with a high carbon content used in copulas, which is produced from a mixture of petroleum coke, fat coal and anthracite according to a special process.
Compared to normal foundry coke, HC coke is characterized by a low ash content (about 3 to 4%), a lower pore volume (porosity of 30% compared to 50% for normal foundry coke) and higher density.
Thanks to the high carbon content of HC coke, the cokecharge can be considerably reduced, unless a temperature increase of the iron is required. This is also associated with a reduced sulfur uptake of the liquid iron.
Buffer coke charge