Patent · US Expired

Apparatus and process for producing perlite

US6244860A · kind A · utility

7Cited by

8References

7Claims

0Family size

Assignee

Messer Griesheim GmbH · DE

Inventors

Gerhard Gross · Achern, DE
Willi Baum · Selm, DE

Key dates

Filing date	Nov 24, 1999
Grant date	Jun 12, 2001
Priority date	—
Expiry date	Nov 24, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B33/26
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In an apparatus for producing perlite granules, having an expansion tube and one or more burners arranged at one end of the expansion tube, the combustion air is blown into the flame through one or more combustion air nozzles. An additional subsonic nozzle is arranged in at least one combustion air nozzle. In a process for expanding raw perlite in the updraft from a flame, with the introduction of oxygen or oxygen-enriched air into this flame, the oxygen or oxygen-enriched air is introduced axially into the flame through subsonic nozzles.

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