Patent · US Expired

Method for the manufacture of SiO.sub.2 granular material

US5979186A · kind A · utility

20Cited by

5References

10Claims

0Family size

Assignee

HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

Rainer Köppler · Seligenstadt, DE
Fritz-Ulrich Kreis · Gelnhausen, DE
Klaus Arnold · Mandelbachtal, DE

Key dates

Filing date	Jul 9, 1998
Grant date	Nov 9, 1999
Priority date	—
Expiry date	Jul 9, 2018

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C1/026
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A method is provided for the manufacture of SiO.sub.2 granular material. Silicic acid is dispersed in a liquid to form a dispersion. The dispersion is stirred in a stirring tank with formation of a homogeneous liquid phase. The homogeneous liquid phase is maintained by stirring at a substantially constant rate until the granular mass develops, when the solids content of the dispersion is within the range of 65 to 80 weight percent. Moisture is gradually extracted to form a granular mass which is dried and sintered.

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