Method for Producing a Quartz Glass granulate

摘要

A silica glass granule has area of 100-5000 mu 2>, ECD (Not defined) of 5-100 mu m, circumference of 20-400 mu m, maximum diameter of 10-140 mu m, minimum diameter of 5-80 mu m, specific Brunauer Emmett Teller (BET) surface area of less than 1 m 2>/g, and impurities of less than 50 ppm. An independent claim is included for a method for preparing the silica glass granule comprising compacting pyrogenic silicon dioxide powder with tamped density of 15-190 g/l to slugs; crushing and removing slug fragments with a diameter of 100-800 mu m; treating slug fragments having tamped density of 300-600 g/l at 600-1100[deg] C in an atmosphere which comprises compounds for removing hydroxyl groups; and sintering at 1200-1400[deg] C.