CARBONBLACK

CARBON BLACK

Among the reinforcing fillers used in rubber industry, a lion's share is constituted by different types of carbon blacks. They are essentially elemental carbon prepared by converting liquid or gaseous hydrocarbons into elemental carbon by partial combustion or thermal decomposition. Depending on the process adopted for the preparation, carbon blacks and lampblack. The furnance blacks, channel blacks and lamp blacks. The furnace blacks are produced by incomplete combustion of natural gas or heavy aromatic residue oils from the petroleum industries, in refractory lined steel furnaces and separating the carbon formed by means of cyclones and filter bags. Finally, they are pelleted and packed, In the thermal process, natural gas or oil is thermally decomposed at about 1300°C in the absence of free air, in cylindrical furnaces filled with an open checker work of slice bricks. The channel blacks are produced by feeding the natural gas or oil into thousands of small burner tips where the small flames inpinge either on to a large rotating drum or on to reciprocating channel irons. The black deposited is scraped out and collected. Lamp black is made by burning oil and allowing the black formed to settle out by gravity in a series of chambers.