| 摘要 |
PURPOSE:In producing spherical silica by remelting ultrafine particulate silica in flame, to produce high-purity ultrafine silica particles having relatively sharp particle size distribution, by previously humidifying ultrafine particulate silica of raw material. CONSTITUTION:Ultrafine particulate silica which is obtained by hydrolyzing a volatile silane compound in flame in a gaseous phase is humidified by adding 0.1-100wt% water to the ultrafine particulate silica. The humidified ultrafine particulate silica is remelted in high-temperature flame to form high-purity ultrafine spherical silica particles having relative sharp particle size distribution of 0.1-100mum and <=30mum average particle diameter, which are separated and collected by a cyclone, bag filter, etc.
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