Patent · US Expired

Apparatus for preparation of a sprayable precipitated silicic acid suspension

US4238322A · kind A · utility

1Cited by

19References

3Claims

0Family size

Assignee

Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

Bernd Brandt
Peter Nauroth · Wesseling, DE
Albert Peters · Lechenich, DE
Helmut Reinhardt

Key dates

Filing date	Jan 18, 1978
Grant date	Dec 9, 1980
Priority date	—
Expiry date	Jan 18, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/82
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.