At present, the new method of preparing silica mainly takes nonmetallic ore and its extension as silicon source, and its preparation method adopts precipitation method. Its technical key is to transform crystalline SiO2 and silicate into amorphous SiO2. Its raw materials mainly include wollastonite, opal, halloysite, olivine, serpentine, kaolin, hard kaolin, coal gangue, fly ash, etc.


In recent years, due to the high price of sodium silicate and sulfuric acid as raw materials for the preparation of silica by precipitation method, and the gradual increase of production costs, the market competition of silica is very fierce. In order to reduce its production cost and occupy a favorable position in the market, domestic enterprises have been looking for an ideal silicon source to produce white carbon black. At present, the raw materials for preparing silica have been expanded from traditional silane and water glass to non-metallic mineral raw materials, and further developed into industrial waste and biomass raw materials