초록 ▼

A silicic acid filter cake and suspension agent are fed to a container equipped with a stirrer having a peripheral speed of about 20-30 m/sec. The ratio of container diameter to stirrer diameter is about 3:1. The ratio of container diameter to level of filling is a maximum of about 1:2. The containe

A silicic acid filter cake and suspension agent are fed to a container equipped with a stirrer having a peripheral speed of about 20-30 m/sec. The ratio of container diameter to stirrer diameter is about 3:1. The ratio of container diameter to level of filling is a maximum of about 1:2. The container contains at least about 1.5 to about 2 kg of silicic acid suspension, for each 1 kg of silicic acid filter cake which is added to the container. The contents of the container is mixed while maintaining a pH of at most about 4. A portion of the resulting silicic acid suspension is drawn off from the zone of highest turbulence in the container. An apparatus for carrying out the process is provided.

대표청구항 ▼

An apparatus for the production of a sprayable, highly concentrated suspension of a precipitated silicic acid having little grit and at least about 12 percent by weight solids, said apparatus comprising: (a) a container having a diameter, said container provided with rotatable stirring means having

An apparatus for the production of a sprayable, highly concentrated suspension of a precipitated silicic acid having little grit and at least about 12 percent by weight solids, said apparatus comprising: (a) a container having a diameter, said container provided with rotatable stirring means having a diameter and a peripheral speed of about 20-30 m/sec; (b) means for feeding a silicic acid filter cake to said container; (c) means for feeding a suspension agent to said container; (d) means for removing a portion of said silicic acid suspension from a zone of highest turbulence of the suspension in said container; said means including a filter basket, and (e) means for maintaining level of filling of said container so that the ratio of container diameter to level of filling is a maximum of about 1:2; wherein the ratio of container diameter to the diameter of said stirring means is about 3:1.