In the coal coke production process, during the coke quenching, handling and screening operation, coke breeze is produced. It is either reused on site (such as in the sinter plant) or sold off site as a byproduct. Coal coke breeze is an important carbonaceous backfill material in cathodic protection. Coke breeze offers a backfill solution since it can be compacted by 95% and offers the best conductivity at moisture levels between 5% and 20%. The value of -3+1 mm represents the most favorable particle size for coke breeze.