The production of white carbon black is mainly divided into precipitation method and gas-phase method:


Precipitation method: Using sodium silicate and sulfuric acid as raw materials, it is prepared by acidification precipitation, washing and drying, with low cost but low purity (90% -95%), widely used in fields such as tires and feed.
Gas phase method: Using silicon tetrachloride as raw material, it is hydrolyzed at high temperature in a hydrogen oxygen flame to produce a purity of over 99.8%. However, it has high energy consumption and cost 3-5 times that of precipitation method. It is mainly used in high-end markets such as electronics and medicine.
Environmental pain points: The precipitation method generates a large amount of saline wastewater, which requires membrane separation or evaporative crystallization technology; The gas-phase method needs to address the issue of corrosiveness of silicon tetrachloride. The industry is exploring biomass silicon sources (such as rice husk ash) and circular economy models to reduce environmental burden.