| 摘要 |
FIELD: technological processes.SUBSTANCE: present invention relates to a method of producing precipitated silica. Production method involves reaction of silicate and acid in presence of electrolyte. Reaction is carried out in four stages. Acid used is at least one of stages, is concentrated acid, selected from group formed by sulphuric acid with concentration of, at least, 80 wt%, in particular, at least, 90 wt%, acetic acid or formic acid with concentration of, at least, 90 wt%, nitric acid with concentration of, at least, 60 wt%, phosphoric acid with concentration of, at least, 75 wt%, hydrochloric acid with concentration of, at least, 30 wt%. Produced suspension is dried by spraying.EFFECT: invention enables production of spherical shaped silicon dioxide, effective as reinforcing filler.15 cl, 2 ex |
