White carbon black is a general term for white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica and fumed silica, which are mainly chemical vapor deposition (CAV) method, also known as pyrolysis method, dry method or combustion method. Its raw materials are generally silicon tetrachloride, oxygen (or air) and hydrogen, which react at high temperatures. The reaction formula is: SiCl4+2H2+O2 ->SiO2+4HCl air and hydrogen are sent to the synthetic hydrolysis furnace after being pressurized, separated, cooled and dehydrated, silica gel dried, dedusted and filtered respectively. The silicon tetrachloride raw material is sent to the distilling tower for rectification, heated and evaporated in the evaporator, and sent to the synthetic hydrolysis furnace with the dried and filtered air as the carrier. After silicon tetrachloride is gasified at high temperature (flame temperature 1000~1800 ℃), it is gasified with a certain amount of hydrogen and oxygen (or air) at a high temperature of about 1800 ℃; At this time, the gas phase silicon dioxide particles generated are very fine, forming aerosol with the gas, which is not easy to capture. Therefore, they are first gathered into larger particles in the aggregator, and then collected by the cyclone separator, and then sent to the deacidification furnace. The gas phase silicon dioxide is purged with nitrogen air until the PH value is 4~6, which is the finished product.