Batch for producing a refractory product, method for producing a refractory product, a refractory product and the use of a synthetic raw material

Patent metadata

Field	Value
Publication number	US-11407685-B2
Application number	US-201816643156-A
Country	US
Kind code	B2
Filing date	Jul 11, 2018
Priority date	Oct 4, 2017
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

The invention relates to a batch composition for producing a refractory product, a method for producing a refractory product, a refractory product, and to the use of a synthetic raw material.

First claim

The invention claimed is:

1. A batch for producing a refractory product comprising the following components:
1.1 a base component of at least one refractory ceramic raw material, wherein the base component comprises at least 50% MgO by mass; and
1.2 at least one synthetic raw material with the following features:
1.2.1 the synthetic raw material consists of bodies, the bodies having the following features:
1.2.1.1 the bodies consist of grains of at least one refractory ceramic raw material sintered together,
1.2.1.2. the bodies having a proportion of clay minerals of less than 10% by mass relative to the total mass of the bodies;

1.2.2. the bodies have a ratio of (thickness):(width):(length) of (1):(≥1 and ≤length):(≥3).

2. Batch according to claim 1 , wherein the bodies comprise grains of at least one of the following refractory ceramic raw materials sintered together: magnesia, spinel, corundum, zirconia, forsterite, chromium ore, zirconia corundum, zirconmullite, aluminum titanate, magnesium titanate or calcium titanate.

3. Batch according to claim 1 , wherein the bodies have a length in the range of 1 to 30 mm.

4. Batch according to claim 1 , wherein the at least one refractory ceramic raw material of the base component is present in the form of grains and wherein the bodies have a length which corresponds at least to the length of the average grain diameter of the largest grains of the base component.

5. Batch according to claim 1 , wherein the bodies are present in a volume in the range of 0.5 to 30% by volume in the batch, relative to the total volume of the batch.

6. Batch according to claim 1 , wherein the base component is present in a volume in the range of 70 to 99.5% by volume in the batch, relative to the total volume of the batch.

7. Batch according to claim 1 , wherein the base component as well as the bodies are present in the batch in such a way that in a refractory product produced from the batch by a ceramic firing, the area of the product formed from the base component on the one hand and the areas of the product formed from the bodies on the other hand differ in their respective microstructure.

8. A method of producing a refractory product comprising the following features:
8.1 provision of a batch, wherein the batch comprises the following components:
a base component of at least one refractory ceramic raw material, wherein the base component comprises at least 50% MgO by mass; and
at least one synthetic raw material with the following features:
the synthetic raw material consists of bodies, the bodies having the following features:
the bodies consist of grains of at least one refractory ceramic raw material sintered together,
the bodies having a proportion of clay minerals of less than 10% by mass relative to the total mass of the bodies;

the bodies have a ratio of (thickness):(width):(length) of (1):(≥1 and ≤length):(≥3),

8.2 firing the batch to a refractory product.

9. A refractory product comprising the following features:
9.1 a first area of interconnected grains of at least one refractory ceramic raw material comprising at least 50% MgO by mass; and
9.2 second areas, the second areas having the following features:
9.2.1 the second areas consist of grains of at least one refractory ceramic raw material sintered together, wherein
9.2.2. the second areas have proportion of clay minerals of less than 10% by mass relative to the total mass of the second areas;
9.2.3 the second areas have a ratio of (thickness):(width):(length) of (1):(≥1 and ≤length):(≥3);

9.3 the second regions are arranged without order in the first area;
9.4 the first area on the one hand and the second areas on the other hand differ in their respective microstructure.

10. Product according to claim 9 , wherein the second areas comprise grains of at least one of the following refractory ceramic raw materials sintered together: magnesia, spinel, corundum, zirconia, forsterite, chromium ore, zirconia corundum, zirconmullite, aluminum titanate, magnesium titanate or calcium titanate.

11. Product according to claim 9 , wherein the second areas have a length in the range of 1 to 30 mm.

12. Product according to claim 9 , wherein the second areas have a length at least equal to the length of the average grain diameter of the largest grains of the first area.

13. Product according to claim 9 , wherein the second areas are present in a proportion by volume in the range of 0.5 to 30% by volume, relative to the total volume of the product.

14. Product according to claim 9 , wherein the first area is present in the product in a proportion by volume in the range of 70 to 99.5% by volume, relative to the total volume of the product.

15. A method comprising:
utilizing a synthetic raw material in a batch to produce a refractory product to reduce the modulus of elasticity of a refractory ceramic product which can be produced from the batch, the synthetic raw material having the following features:
15.1 the synthetic raw material consists of bodies, the bodies having the following features:
15.1.1 the bodies consist of grains of at least one refractory ceramic raw material sintered together, wherein the refractory ceramic raw material comprises a base component, the base component comprises at least 50% MgO by mass, and further wherein
15.1.2 the bodies have a proportion of clay minerals of less than 10% by mass, relative to the total mass of the bodies;
15.1.3 the bodies have a ratio of (thickness):(width):(length) of (1):(≥1 and ≤length):(≥3);

15.2 the synthetic raw material is utilized in a batch to produce a refractory product to reduce the modulus of elasticity of a refractory ceramic product which can be produced from the batch.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Majcenovic Christian
• Geith Martin
• Nilica Roland
• Nievoll Josef

Classifications

• C04B2235/528

  Spheres · CPC title

• C04B2235/5427

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

• C04B2235/3463

  Alumino-silicates other than clay, e.g. mullite · CPC title

• C04B35/443

  Magnesium aluminate spinel · CPC title

• C04B2235/78

  Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures · CPC title