A by-product of coke manufacture; it is the residue from the screening of heat-treated coke. The particle size is less than 10 mm. Generally, coke breeze has a volatile matter content of < 3 wt.%.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 486 (https://doi.org/10.1351/pac199567030473)