China provides that it can be used for rice, flour products, candy, biscuits and pastries with the maximum usage amount of 5.0g/kg.ģ. It can be used for pastry with the usage amount of 0.001% to 0.1%.Ģ. It can also be derived from the carbonization of cocoa shell and beef bone or from the combustion of vegetable oil.ġ. It is obtained by the carbonization of the plant material such as peat. There are mainly furnace, slot method, thermal cracking, three methods. At present, oil furnace method is the most efficient and most economical method with the oil furnace black production amount accounting for 70-90% of the total carbon black production. Then it had successively developed of a variety of process methods. It was not until 1912 when Mott found the reinforcement effect carbon black on the rubber before the carbon black industry had gotten rapid development. In 1872, the United States first used natural gas as raw material to produce carbon black using tank method and mainly used it as a coloring agent. In ancient times, china has already applied incomplete combustion of vegetable oil for making pigment carbon black. Raw gas, air → combustion cracking → collection → granulation → packaging → finished product.Ĭarbon black is one of the oldest industrial products. In the case of using pigment for carbon black, in order to facilitate the dispersion, the granulation is unnecessary. Then add a small amount of water to the carbon black to make it into paste-like shape and have a small needle rotated inside it to forming micro-pellets, followed by drying to obtain the finished product. ![]() However, the body is still very light and loose, thus should be shaken to a become a bit solid. Then the carbon black is softened, filtered to remove the hard particles and scale and further sent into the mill grinding to enable more uniform thickness. The resulting carbon black was scraped into a funnel with a fixed doctor blade and sent to a central packing chamber for disposal. In order to maintain normal production, the required amount of air is about 2.5 to 3 times the theoretical calculation. The groove can move back and forth horizontally, with a moving speed of 3 to 4 mm/s. At this time, the temperature of olefin burning is reduced from about 1000 to 1400 ° C to about 500 ° C, and the carbon black is accumulated. The flame then goes directly into the channel iron with the distance between the burner and the slot surface being 65~80 mm. Natural gas is sprayed with appropriate force from the burner nozzle and burned in the case of insufficient air, that is, to generate a bright and black smoke flame. It contains a number of olefin burner inside it. The form of the combustion chamber can be either long and short and is made of iron plate. ![]() Natural gas tank method of making carbon black: take natural gas as raw material and use iron pipe to send it into the combustion chamber.
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