The preparation process of white carbon black is a complex and delicate process, involving multiple links such as raw material selection, reaction condition control, and post-treatment. Different preparation processes have a significant impact on the properties and application fields of white carbon black.



Chemical precipitation method: This is currently the most commonly used method for producing white carbon black in industry. This method uses sodium silicate and sulfuric acid as raw materials, and controls the reaction conditions (such as temperature, pH value, reactant concentration, etc.) to cause a precipitation reaction between sodium silicate and sulfuric acid, resulting in the formation of silica precipitate. Subsequently, after washing, drying, crushing and other post-treatment processes, white carbon black products are obtained. The chemical precipitation method has the advantages of easy availability of raw materials, mature process, and low cost, but the product purity is relatively low, and the specific surface area and pore structure are difficult to control.


Gas phase method: Gas phase method white carbon black is prepared by high-temperature gas phase reaction. This method uses silicon tetrachloride or silane as raw materials and undergoes gas-phase reaction with hydrogen or oxygen at high temperature to generate silicon dioxide particles. Gas phase white carbon black has the advantages of high purity, large specific surface area, and developed pore structure, but it requires large equipment investment, high energy consumption, and high production costs, and is mainly used in high-end fields.


Sol gel method: Sol gel method is a new method to prepare silica. In this method, silica alkoxide or silicate ester is used as raw material, sol is formed through hydrolysis polycondensation reaction, and then white carbon black is obtained through gel, drying, calcination and other processes. Sol gel method can accurately control the particle size, specific surface area and pore structure of silica, but the process is complex and the cost is high, so it is still in the research stage.

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