coke breeze

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.%.
PAC, 1995, 67, 473 (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 486