Also known as: Furnace black
Carbon black is a specialty product, mad up of solid carbon in a fine powder form.
The major uses for carbon black are as a filler in rubber (tire) production and as a pigment (black) in inks and paints.
For a refiner, carbon black production is a route to increasing the value of FCC slurry which is otherwise a very low-value product, usually blended into residual fuel oil.
Few refiners have on-site carbon black plants. Most are stand-alone, third-party plants that source FCC slurry from multiple refineries.