Composition for producing a refractory ceramic product and method

Patent metadata

Field	Value
Publication number	US-9975810-B2
Application number	US-201414889910-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Jun 10, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The invention relates to a batch for producing an unshaped refractory ceramic product, to a method for producing a fired refractory ceramic product, to a fired refractory ceramic product and to the use of an unshaped refractory ceramic product.

First claim

The invention claimed is:

1. A batch for producing an unformed refractory ceramic product comprising:
1.1 55 to 83.5% by mass of at least one magnesia-based raw material in the form of at least one of the following raw materials: sintered magnesia or olivine, and
1.2 16 to 44.5% by mass of raw magnesite comprising primarily magnesium carbonate, each relative to the total mass of the batch; wherein
1.3 a total calcium carbonate content of the raw magnesite lies below 10% by mass relative to the total mass of the raw magnesite; and
1.4 0.5 to 4% by mass of clay.

2. The batch according to claim 1 , wherein at least one of the following oxides exhibits the maximum fraction indicated in each case:
CaO<5% by mass;
Fe 2 O 3 <3.5% by mass;
Al 2 O 3 <3.0% by mass;
relative to the total mass of the batch in each case.

3. A method for producing a fired refractory ceramic product comprising the following steps:
5.1 provision of a batch comprising:
55 to 83.5% by mass of at least one magnesia-based raw material in the form of at least one of the following raw materials: sintered magnesia or olivine, and 16 to 44.5% by mass of raw magnesite comprising primarily magnesium carbonate, each relative to the total mass of the batch; wherein a total calcium carbonate content of the raw magnesite lies below 10% by mass relative to the total mass of the raw magnesite, and wherein in addition to the at least one magnesia-based raw material, and said raw magnesite, 0.5 to 4% by mass of clay;

5.2 application of the batch to a desired production site;
5.3 firing of the applied batch into a fired refractory ceramic product.

4. The method according to claim 3 for producing said fired refractory ceramic product which exhibits at least one of the following phases in the fractions indicated in each case:
forsterite: >5% by mass;
merwinite: <0.5% by mass;
relative to the total mass of the product in each case.

5. The method according to claim 3 for producing said fired refractory ceramic product wherein at least one of the following oxides exhibits at most the fraction indicated in each case:
CaO<5% by mass;
Fe 2 O 3 <3.5% by mass;
Al 2 O 3 <3.0% by mass;
relative to the total mass of the product in each case.

6. The method according to claim 3 , wherein the batch is applied to the desired application site as an injection mass, tundish mass, ramming mass or backfilling mass.

7. The method according to claim 4 for producing said fired refractory ceramic product, wherein at least one of the following oxides exhibits at most the fraction indicated in each case:
CaO<5% by mass;
Fe 2 O 3 <3.5% by mass;
Al 2 O 3 <3.0% by mass;
relative to the total mass of the product in each case.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Eckstein Wilfried

Classifications

• C04B35/04 Primary

  based on magnesium oxide · CPC title

• C04B2235/5212

  Organic · CPC title

• C04B2235/77

  Density · CPC title

• C04B38/0067

  characterised by the density of the end product · CPC title

• C04B2235/447

  Phosphates or phosphites, e.g. orthophosphate or hypophosphite · CPC title