Fluffy coke

The fluffy carbon black coming out of the filter is pneumatically conveyed into a first storage tank. Small amounts of impurities ( grit, e.g., iron, rust, or coke particles) are either removed by magnets and classifiers or milled to an appropriate consistency. 

Coke formed on solid surfaces during the pyrolyses of acetylene, ethylene, ethane, propylene, and butadiene were examined by using a scanning electron microscope. Seven types of coke have been identified braided filament, uniform diameter filament, needle or spike, ribbon, fluffy or cottonlike fibers, knobby, and amphorous. The first four types contained metal (especially iron) and were magnetic. Magnetic cokes formed sometimes on Incoloy 800, stainless steel 304, stainless steel 410, and Hastelloy X surfaces, but never on Vycor glass or aluminized Incoloy 800 surfaces. Conditions at which each type of coke was formed are discussed. 

At 600°C the coke no longer looks fluffy. It seems to be approaching an amorphous state and is less magnetic in nature. At 770°C the coke is rather knobby in appearance. Interestingly, a rather fluffy-appearing filament is present on one of the knobs. The knobs in general appear to be smooth and, in some cases, quite spherical. 

Acetylene at 780°C on alonized surface fluffy (or gas phase) and knobby (but almost filament-like) cokes. 

Fines Light, fluffy, dry, dusty Heavy Fragile, where degradation is harmful cottonseed, sand Soda ash, pulverized coal Cement, flue dust Coke, coal Soap chips 220-250 ft/min 250-300 ft/min 150-200 ft/min 200-250 ft/min ... 

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