| abstract |
The invention relates to a process for the preparation of precipitated silicas, comprising the precipitation reaction between a silicate and an acidifying agent whereby a suspension of precipitated silica is obtained, followed by separation and drying of this suspension, wherein among others, one of the following three operations (a), (b) or (c) is carried out: (a) a compound of aluminum and a basic agent are added simultaneously, (b) a silicate is added simultaneously and an aluminum compound; (c) acidifying agent, a silicate and an aluminum compound are added simultaneously. |