Batch for production of a refractory product, a process for the production of a refractory product, a refractory product as well as the use of a refractory product

Patent metadata

Field	Value
Publication number	US-11198647-B2
Application number	US-201916357177-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Feb 9, 2015
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

The invention concerns a batch for the production of a refractory product, a process for the production of a refractory product, a refractory product as well as the use of a refractory product.

First claim

What is claimed is:

1. A process for the production of a refractory product, comprising the following steps:
providing a batch, the batch comprising:
at least 50% by weight of a base component based on alumina in the form of one or more of the following components: fused corundum, sintered corundum or calcined alumina;
at least 0.5% by weight of at least one of the following silicate components: at least one silicate component based on aluminium silicate or at least one silicate component based on zirconium silicate; and
a carbon component;

melting the batch; and
cooling the melt, wherein the product, produced by the process, has a density of more than 3.3 g/cm 3 , an open porosity of less than 8% by volume, and a content of Al 4 C 3 of at most 2% by weight, and further wherein the product comprises the following phases in the following proportions:
corundum: 64% to 99.5% by weight; and
total weight of SiC, Al 4 O 4 C, SiAlON, SiCAlON, Al oxynitride: 0.5% to 36% by weight.

2. The process of claim 1 , wherein the batch has a carbon component in the form of graphite.

3. The process of claim 1 , wherein the refractory product is used as a raw material for the production of another refractory product.

4. The process of claim 1 , wherein the produced refractory product has a proportion of carbon in the product of less than 2.4% by weight.

5. The process of claim 1 , wherein the produced refractory product is in the form of a solidified melt.

6. A refractory product produced by a process, the process comprising the following steps:
providing a batch, the batch comprising:
at least 50% by weight of a base component based on alumina in the form of one or more of the following components: fused corundum, sintered corundum or calcined alumina;
at least 0.5% by weight of at least one of the following silicate components: at least one silicate component based on aluminium silicate or at least one silicate component based on zirconium silicate; and
a carbon component;

melting the batch; and
cooling the melt, wherein the product, produced by the process, has a density of more than 3.3 g/cm 3 , an open porosity of less than 8% by volume, and a content of Al 4 C 3 of at most 2% by weight, and further wherein the product comprises the following phases in the following proportions:
corundum: 64% to 99.5% by weight; and
total weight of SiC, Al 4 O 4 C, SiAlON, SiCAlON, Al oxynitride: 0.5% to 36% by weight.

7. The refractory product as claimed in claim 6 , with a proportion of carbon in the product of less than 2.4% by weight.

8. The refractory product as claimed in claim 6 , in the form of a solidified melt.

9. The refractory product as claimed in claim 6 , wherein the batch has at least one of the following silicate components: kaolin, metakaolin, fireclay, pyrophyllite, mullite, or zircon.

10. The refractory product as claimed in claim 6 , wherein the batch has a carbon component in the form of graphite.

11. The refractory product as claimed in claim 6 , wherein the refractory product is used as a raw material for the production of another refractory product.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Djuricic Boro
• Freiberger Norbert
• Muhlhausser Jurgen
• Bauer Christoph

Classifications

• C04B2235/5427

  millimeter or submillimeter sized, i.e. larger than 0,1 mm · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2235/3826

  Silicon carbides · CPC title

• C04B2235/349

  Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite · CPC title

• C04B2235/3869

  Aluminium oxynitrides, e.g. AlON, sialon · CPC title