Method for producing a porous sintered magnesia, backfill for producing a heavy-clay refractory product with a granulation from the sintered magnesia, product of this type, and method for the production thereof, lining of an industrial furnace and industrial furnace

US11440847B2 · kind B2 · utility

Assignee

• Refratechnik Holding GmbH · DE

Inventors

• Hans-Jurgen Klischat · Gleichen, DE
• Robert Plummer · Indianapolis, US
• Carsten Vellmer · Oebisfelde, DE
• Holger Wirsing · Oettingen, DE

Key dates

• Filing date: Sep 13, 2018
• Grant date: Sep 13, 2022
• Expiry date: Sep 13, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/9607
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for producing a granular material from sintered magnesia by sintering of pressed articles, in particular pellets, from MgO powder, preferably from caustic MgO powder, and subsequent mechanical comminution of the pressed articles, the sintering being carried out in such a way that the granular material has a grain porosity (total porosity), according to DIN EN 993-1:1195-04 and DIN EN 993-18:1999-01, of from 15 to 38 vol %, preferably 20 to 38 vol %. Also, a batch for producing a coarse ceramic, refractory, shaped or unshaped product containing the porous sintered magnesia, to such a product produced from the batch and to a method for its production, to a lining, in particular a working casing and/or a backing, of a large-volume industrial furnace, the lining, in particular the working casing and/or the backing, having at least one such product, as well as to such an industrial furnace.