Method of producing low-carbon, white husk ash

US4049464A · kind A · utility

Assignee

• Refratechnik Holding GmbH · DE

Inventors

• Alexander Tutsek · Göttingen, DE
• Peter Bartha · Bovenden, DE

Key dates

• Filing date: Sep 2, 1976
• Grant date: Sep 20, 1977
• Expiry date: Sep 2, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/91
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Low carbon, white husk ash suitable for use in manufacturing building materials, more particularly refractory building materials are prepared by first removing volatile constituents by heating the husks, normally rice husks but alternatively, for example, wheat, oats or barley husks, to a first relatively low temperature below the ignition point of the husks. Fixed carbon is then oxidized in the presence of a reagent by heating the husks to a second temperature above the separation temperature but below the crystallization temperature of the SiO.sub.2 in the husks, following by a heat treatment at a third temperature above the crystallization temperature of the SiO.sub.2, to produce a uniform SiO.sub.2 crystal structure.