Refractory batch, a method for producing an unshaped refractory ceramic product from the batch and an unshaped refractory ceramic product obtained by the method

Patent metadata

Field	Value
Publication number	US-11905217-B2
Application number	US-201816643267-A
Country	US
Kind code	B2
Filing date	Nov 8, 2018
Priority date	Dec 19, 2017
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

The invention relates to a refractory batch, to a method for producing an unshaped refractory ceramic product from the batch, and to an unshaped refractory ceramic product obtained by said method.

First claim

The invention claimed is:

1. A refractory batch comprising the following components:
1.1 a basic component comprising one or more raw materials based on magnesia;
1.2 a carbon component comprising one or more carbon carriers;
1.3 an aluminum component comprising one or more metallic aluminum carriers;
1.4 an aqueous binder; and
1.5 aluminum sulfate.

2. The refractory batch according to claim 1 , wherein the basic component consists of at least 90% by mass of magnesia.

3. The refractory batch according to claim 1 , wherein the basic component consists of one or more of the following raw materials based on magnesia: sintered magnesia and fused magnesia.

4. The refractory batch according to claim 1 , wherein the basic component is present in a proportion of at least 75% by mass relative to a total mass of the refractory batch.

5. The refractory batch according to claim 1 , wherein the aluminum component consists of one or more of the following carriers of metallic aluminum: metallic aluminum and at least one metal alloy comprising aluminum.

6. The refractory batch according to claim 1 , wherein the aluminum sulfate is present in a proportion in range from 0.05 to 1.0 % by mass relative to a total mass of the refractory batch.

7. The refractory batch according to claim 1 , wherein the aqueous binder is present in a proportion in range from 4.0 to 15.0% by mass relative to total mass of the refractory batch.

8. A method for producing an unshaped refractory ceramic product, comprising the following steps:
9.1 providing a refractory batch, the refractory batch comprises:
a basic component comprising one or more raw materials based on magnesia;
a carbon component comprising one or more carbon carriers;
an aluminum component comprising one or more metallic aluminum carriers;
an aqueous binder; and
aluminum sulfate;

9.2 providing a vessel for holding a molten steel in a steel treatment plant;
9.3 casting the refractory batch onto a portion of the vessel which comes into contact with the molten steel when the vessel is used in the plant; and
9.4 heating the vessel so that the refractory batch cast on the portion forms an unshaped refractory ceramic product.

9. A product obtained by a method, the method comprising:
providing a refractory batch, the refractory batch comprises:
a basic component comprising one or more raw materials based on magnesia;
a carbon component comprising one or more carbon carriers;
an aluminum component comprising one or more metallic aluminum carriers;
an aqueous binder; and
aluminum sulfate;

providing a vessel for holding a molten steel in a steel treatment plant;
casting the refractory batch onto a portion of the vessel which comes into contact with the molten steel when the vessel is used in the plant; and
heating the vessel so that the batch cast on the portion forms an unshaped refractory ceramic product,
wherein the product comprises the following phases:
periclase;
magnesia spinel; and
aluminum oxycarbide.

10. The product according to claim 9 , having at least one of the following physical properties:
bulk density: 2.55 to 2.70 g/cm 3 ;
open porosity: 16 to 22% by volume;
cold bending strength: 0.5 to 5 MPa;
cold compressive strength: 15 to 40 MPa;
hot bending strength at 1,400° C. in a reducing atmosphere: 5 to 8 MPa; or
hot bending strength at 1,500° C. in a reducing atmosphere: 4 to 7 MPa.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Heid Stefan
• Nilica Roland

Classifications

• C04B35/04 Primary

  based on magnesium oxide · CPC title

• C04B35/6264

  Mixing media, e.g. organic solvents · CPC title

• C04B35/6303

  Inorganic additives · CPC title

• C04B35/63424

  Polyacrylates; Polymethacrylates · CPC title

• C21B13/12

  in electric furnaces · CPC title