Fused raw material for the production of a refractory product, a method for the production of the fused raw material and a use of the fused raw material

Patent metadata

Field	Value
Publication number	US-2020277232-A1
Application number	US-201816764379-A
Country	US
Kind code	A1
Filing date	Oct 30, 2018
Priority date	Jan 16, 2018
Publication date	Sep 3, 2020
Grant date	—

Abstract

The invention concerns a fused raw material for the production of a refractory product, a method for the production of the fused raw material and a use of the fused raw material.

First claim

1 . Fused raw material for the production of a refractory product comprising the following mineralogical phases:
Magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 ; and Al 4 O 4 C.

2 . Fused raw material according to claim 1 , comprising the following mineralogical phases in the following proportions:
Magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 :50 to 99% by mass; and Al 4 O 4 C: 1 to 50% by mass.

3 . Fused raw material according to claim 1 , comprising the following mineralogical phases in the following proportions:
Magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 :70 to 90% by mass; and Al 4 O 4 C: 10 to 30% by mass.

4 . Fused raw material according to claim 1 , wherein the magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 has a proportion of Al 2 O 3 in the range from 77 to 97% by mass.

5 . Fused raw material according to claim 1 , comprising magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 and Al 4 O 4 C in a total mass of at least 95% by mass.

6 . Fused raw material according to claim 1 , comprising magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 and Al 4 O 4 C in a total mass of at least 99% by mass.

7 . Fused raw material according to claim 1 , having a thermal expansion of at most 8.0 ppm/K.

8 . Method for producing a fused raw material according to claim 1 , comprising the following steps:
providing a batch having a chemical composition which comprises:
Al 2 O 3 ;
MgO; and
C;
forming a melt from the batch; and cooling the melt; wherein Al 2 O 3 , MgO and C are present in such proportions that, when the melt is formed and cooled, a portion of the Al 2 O 3 with MgO forms magnesia spinel with a hyperstoichiometric proportion of Al 2 O 3 and a portion of the Al 2 O 3 with C forms Al 4 O 4 C.

9 . The method according to claim 8 , wherein the batch has a chemical composition comprising the following substances in the following proportions:
Al 2 O 3 : 77.5 to 98.5% by mass; MgO: 1 to 22% by mass; and C: 0.5 to 15% by mass.

10 . The method according to claim 8 , wherein the batch has a chemical composition comprising the following substances in the following proportions:
Al 2 O 3 : 78 to 85% by mass; MgO: 6 to 15% by mass; C: 8 to 12% by mass.

11 . Use of the fused raw material according to claim 1 for the production of a refractory product with the following proportions:
provision of a fused raw material according to claim 1 ; mixing the fused raw material with at least one additional raw material to produce a refractory batch; and
application of temperature to the batch.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Piribauer Christoph
• Freiberger Norbert
• Djuricic Boro
• Muehlhaeusser Juergen
• Nilica Roland

Classifications

• C04B35/05

  Refractories by fusion casting · CPC title

• C04B2235/3895

  Non-oxides with a defined oxygen content, e.g. SiOC, TiON · CPC title

• C04B35/443 Primary

  Magnesium aluminate spinel · CPC title

• C04B2235/9607

  Thermal properties, e.g. thermal expansion coefficient · CPC title

• C04B35/10

  based on aluminium oxide · CPC title