The production technology of white carbon black directly affects its performance and cost, and mainstream processes include:
Precipitation process:
Raw materials: Sodium silicate (water glass) and sulfuric acid/hydrochloric acid.
Step: Acidification reaction → Filtration and washing → Drying and crushing → Surface modification.
Characteristics: The process is mature, but the energy consumption is high, and the pH value needs to be controlled to avoid agglomeration.
Gas phase process:
Raw materials: silicon tetrachloride with hydrogen and oxygen.
Step: High temperature hydrolysis → Separation and collection → Deacidification treatment → Packaging.
Features: The product has high purity (>99.8%), but requires large equipment investment and high technical barriers.
Innovation direction:
The utilization of biomass materials such as rice husk ash and diatomaceous earth reduces dependence on quartz sand.
Continuous production technology improves efficiency and reduces waste emissions.