Granules based on pyrogenically prepared silicon dioxide, method for their preparation and use thereof

22 Granules based on silicon dioxide and having the properties: They are prepared by dispersing silicon dioxide in water, spray drying, optionally heating and/or silanizing.Whereas a pyrogenic silicon dioxide powder with a BET surface area of 30 to 90 m/g, a DBP index of 80 or less, a mean aggregate area of less than 25000 nmand a mean aggregate circumference of less than 1000 nm, wherein at least 70% of the aggregates have a circumference of less than 1300 nm or a high-purity pyrogenically prepared silicon dioxide having metal contents of less than 0.2 μg/g is prepared by reacting a silicon tetrachloride having a metal content of less than 30 ppb by means of flame hydrolysis is used.