Refractory ceramic batch composition, use of a batch composition of this type, and metallurgical melting vessel

Patent metadata

Field	Value
Publication number	US-2017050884-A1
Application number	US-201515119711-A
Country	US
Kind code	A1
Filing date	Jan 22, 2015
Priority date	Apr 15, 2014
Publication date	Feb 23, 2017
Grant date	—

Abstract

The invention relates to a refractory ceramic batch for the production of an unformed refractory ceramic batch, the use of a batch of this kind for lining metallurgical melting vessels and also a metallurgical melting vessel which is lined with an unformed refractory ceramic product based on a batch of this kind.

First claim

1 . A refractory ceramic batch for the production of an unformed refractory ceramic product which comprises the following raw materials:
1.1 one or a plurality of magnesia-based raw materials low in iron with a fraction in the region of 66 to 94% by mass; 1.2 one or a plurality of calcium carbonate-based raw materials with a fraction in the region of 5 to 30% by mass; and 1.3 iron powder with a fraction in the region of 1 to 6% by mass.

2 . The batch according to claim 1 , wherein the fraction of iron in the magnesia-based raw materials low in iron, calculated as Fe 2 O 3 and relative to the total mass of the raw materials low in iron, is below 1.5% by mass.

3 . The batch according to claim 1 , wherein the fraction of calcium in the magnesia-based raw materials low in iron, calculated as CaO and relative to the total mass of the raw materials low in iron, is below 5% by mass.

4 . The batch according to claim 1 , wherein the fraction of magnesia in the magnesia-based raw materials low in iron, relative to the total mass of raw materials low in iron, is above 90% by mass.

5 . The batch according to claim 1 with magnesia-based raw materials low in iron in the form of at least one of the following raw materials: fused magnesia or sintered magnesia.

6 . The batch according to claim 5 , wherein the magnesia-based raw materials low in iron have a grain size of maximum 10 mm.

7 . The batch according to claim 1 , wherein the fraction of calcium carbonate in the calcium carbonate-based materials, relative to the total mass of the calcium carbonate-based raw materials, is above 90% by mass.

8 . The batch according to claim 1 with calcium carbonate-based raw materials in the form of at least one of the following raw materials: limestone or dolomite.

9 . The batch according to claim 1 , wherein the calcium carbonate-based raw materials have a grain size of maximum 8 mm.

10 . The batch according to claim 1 , wherein the iron powder has a grain size of maximum 0.3 mm.

11 - 13 . (canceled)

14 . A method comprising:
lining metallurgical melting vessels with unformed refractory ceramic product, wherein the unformed refractory ceramic product comprises:
1.1 one or a plurality of magnesia-based raw materials low in iron with a fraction in the region of 66 to 94% by mass;
1.2 one or a plurality of calcium carbonate-based raw materials with a fraction in the region of 5 to 30% by mass; and
1.3 iron powder with a fraction in the region of 1 to 6% by mass.

15 . The method of claim 14 , wherein a batch of the unformed refractory ceramic product is prepared using at least one plasticizer.

16 . A metallurgical melting vessel which is lined with an unformed refractory ceramic product, wherein the unformed refractory ceramic product is produced by a batch which comprises the following raw materials:
1.1 one or a plurality of magnesia-based raw materials low in iron with a fraction in the region of 66 to 94% by mass; 1.2 one or a plurality of calcium carbonate-based raw materials with a fraction in the region of 5 to 30% by mass; and 1.3 iron powder with a fraction in the region of 1 to 6% by mass.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Eckstein Wilfried
• Zettl Karl-Michael

Classifications

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/321

  Dolomites, i.e. mixed calcium magnesium carbonates · CPC title

• F27D1/0009

  Comprising ceramic fibre elements · CPC title

• C04B2235/5472

  Bimodal, multi-modal or multi-fraction · CPC title

• F23M2900/05004

  Special materials for walls or lining · CPC title