Patent · US Active

Method for producing SiO2 granulate

US9902621B2 · kind B2 · utility

0Cited by

8References

17Claims

0Family size

Assignee

HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

Mario Such · Gräfenhainichen, DE
Gerhard Schoetz · Aschaffenburg, DE
Andreas Langner · Alzenau, DE

Key dates

Filing date	Apr 25, 2013
Grant date	Feb 27, 2018
Priority date	—
Expiry date	Jun 13, 2034

Classification

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

Abstract

The invention relates to a process for producing SiO2 granules by freezing and re-thawing an SiO2 suspension, wherein a separation of liquid and sediment composed of agglomerated SiO2 particles occurs in the course of thawing, the liquid removed is decanted and the residual moisture in the sediment is removed by a drying step with formation of the SiO2 granules. According to the invention, an auxiliary comprising alkali metal-free bases in the form of nitrogen hydrides is added to the suspension to set the pH greater than 7.

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