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-2020207665-A1
Application number	US-201816643267-A
Country	US
Kind code	A1
Filing date	Nov 8, 2018
Priority date	Dec 19, 2017
Publication date	Jul 2, 2020
Grant date	—

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

1 . 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 one or more sulfates with a solubility of at least 15 g per 100 g of water.

2 . The batch according to claim 1 , wherein the sulfates are one or more of the following sulfates: sodium sulfate, iron sulfate, lithium sulfate, magnesium sulfate or aluminum sulfate.

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

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

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

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

7 . The batch according to claim 1 , wherein the one or more sulfates are present in a proportion in the range from 0.05 to 1.0% by mass.

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

9 . Method for producing an unshaped refractory ceramic product, comprising the following steps:
9.1 providing a batch, the 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
one or more sulfates with a solubility of at least 15 g per 100 g of water;
9.2 providing a vessel for holding a molten steel in a steel treatment plant; 9.3 casting the 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 batch cast on the portion forms an unshaped refractory ceramic product.

10 . Product obtained by a method the method comprising:
providing a batch, the 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
one or more sulfates with a solubility of at least 15 g per 100 g of water:
providing a vessel for holding a molten steel in a steel treatment plant; casting the 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.

11 . The product according to claim 10 , 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 (1,400° C., red. atmosphere): 5 to 8 MPa; or hot bending strength (1,500° C., red. atmosphere): 4 to 7 MPa.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Heid Stefan
• Nilica Roland

Classifications

• C04B2235/448

  Sulphates or sulphites · CPC title

• C04B35/62645

  Thermal treatment of powders or mixtures thereof other than sintering · CPC title

• C04B35/622

  Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/77

  Density · CPC title