The difference between the preparation process of white carbon black and silicon micro powder

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White carbon black

White carbon black is mainly prepared by chemical methods, including gas-phase method and precipitation method. The gas-phase method generates nanoscale silica particles through chemical reactions at high temperatures, such as hydrolysis of silicon tetrachloride (SiCl ₄) or oxidation of silane (SiH ₄) in a hydrogen oxygen flame. The white carbon black produced by this method has high purity and uniform particle size distribution, and is commonly referred to as gas-phase white carbon black. The precipitation method involves the reaction of sodium silicate (Na ₂ SiO ∝) with sulfuric acid (H ₂ SO ₄) or hydrochloric acid (HCl) to produce silica precipitate, which is then washed, dried, and ground to obtain white carbon black. The cost of producing white carbon black by precipitation method is lower, but the particle size distribution is wider.


Silica powder

The preparation process of silicon micro powder is relatively complex and diverse. In the early days, silicon micro powder was mainly used as fine powder for chimney dust collection in steel plants, and later named after ultrafine quartz powder. With the development of industrial technology, the preparation of silicon micro powder is gradually shifting towards specialized production. At present, the production methods of silicon micro powder mainly include industrial by-product collection and specialized production. The industrial by-product collection method is used in the production of industrial silicon or ferrosilicon alloys. Silicon vapor is generated by the reaction between silica (SiO ₂) and carbonaceous reducing agents in a high-temperature electric arc furnace. The silicon vapor combines with oxygen in the air during the condensation process to form fine silicon dioxide particles, which are collected as silicon micro powder. This method has low cost and high yield, but it is difficult to control product purity and particle uniformity. The special production method is to directly generate high-purity silicon powder through chemical precipitation, sol gel, vapor phase synthesis and other processes. These processes can produce silicon micro powders with smaller and more uniform particle sizes, suitable for high-end application fields.