Refractory ceramic product, batch for the manufacture such a product and method for manufacturing such a product

Patent metadata

Field	Value
Publication number	US-2020039885-A1
Application number	US-201716338490-A
Country	US
Kind code	A1
Filing date	Aug 23, 2017
Priority date	Nov 17, 2016
Publication date	Feb 6, 2020
Grant date	—

Abstract

The invention relates to a fire-resistant ceramic product, a batch for manufacturing a product of said type, and a process for manufacturing a product of said type.

First claim

1 . A refractory ceramic product comprising the following features:
the product has a ceramic bond; the product has a proportion of MgO of at least 75% by mass; the product has a proportion of sulphur in the range from 0.01 to 0.20% by mass.

2 . The product according to claim 1 having a proportion of sulphur in the range from 0.01 to 0.05% by mass.

3 . The product according to claim 1 , said product having a proportion of MgO in the range from 75 to 97% by mass.

4 . The product according to a claim 1 , said product having a proportion of Al2O3 in the range from 1 to 20% by mass.

5 . The product according to claim 1 , said product having a proportion of CaO in the range from 0.5 to 3.0% by mass.

6 . The product according to claim 1 , said product having a proportion of SiO 2 below 1.5% by mass.

7 . The product according to claim 1 , said product having a proportion of Fe 2 O 3 below 10% by mass.

8 . The product according to claim 1 , said product having a proportion of Na 2 O below 0.5% by mass.

9 . The product according to claim 1 , said product having a proportion of K 2 O of less than 0.2% by mass.

10 . The product according to claim 1 , said product having a proportion of the total mass of Na 2 O and K 2 O of less than 0.5% by mass.

11 . A batch for the manufacture of a product comprising the following features:
a basic component comprising one or more magnesia-based raw materials; a component comprising sulphur comprising one or more raw materials comprising sulphur; the batch has a proportion of MgO of at least 75% by mass; the batch has a proportion of sulphur such that a refractory ceramic product that can be fired from the batch has a proportion of sulphur in the range from 0.01 to 0.20% by mass.

12 . The batch according to claim 11 , wherein the basic component comprises one or more of the following magnesia-based raw materials: sintered magnesia, fused magnesia, sintered doloma or fused doloma.

13 . The batch according to claim 11 , wherein the basic component comprises one or more of the following raw materials comprising alumina in addition to one or more magnesia-based raw materials: magnesia spinel, sintered corundum, fused corundum, calcined alumina, galaxite, hercynite or pleonast.

14 . The batch according to claim 11 , wherein the component comprising sulphur comprises a raw material comprising sulphur in the form of a used lining of a rotary cement kiln.

15 . A method for the manufacture of a product, the method comprising:
providing a batch, the batch comprising:
a basic component comprising one or more magnesia-based raw materials;
a component comprising sulphur comprising one or more raw materials comprising sulphur;
the batch has a proportion of MgO of at least 75% by mass; and
the batch has a proportion of sulphur such that a refractory ceramic product that can be fired from the batch has a proportion of sulphur in the range from 0.01 to 0.20% by mass; and
firing the batch to a refractory ceramic product.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Klitzsch Michael
• Geith Martin
• Kahr Friedrich
• Königshofer Sandra

Classifications

• C04B35/10

  based on aluminium oxide · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B35/04 Primary

  based on magnesium oxide · CPC title

• C04B2235/72

  Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics · CPC title

• C04B2235/3272

  Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · CPC title