Method for treating refractory ceramic products, use of the treated products, and a refractory ceramic product

Patent metadata

Field	Value
Publication number	US-10759703-B2
Application number	US-201715789236-A
Country	US
Kind code	B2
Filing date	Oct 20, 2017
Priority date	Nov 17, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A method for treating refractory ceramic products is described herein. The method includes providing a refractory ceramic product, comprising magnesia and at least one of the following salts: one or more alkali salts and one or more alkaline earth salts. The method also includes providing a water-based liquid, combining the refractory ceramic product with the liquid, and separating the refractory ceramic product and the liquid.

First claim

The invention claimed is:

1. A method for treating refractory ceramic products, said method having the following features:
providing a refractory ceramic product in the form of a used refractory ceramic lining of a rotary kiln for burning cement clinker, comprising:
magnesia and
at least one of the following salts: one or more alkali salts and one or more alkaline earth salts, in which the refractory ceramic product comprises a content of alkali or alkaline earth salts of at least 1 mass %, in relation to the total mass of the refractory ceramic product;

providing a water-based liquid;
combining the refractory ceramic product with the liquid, wherein combining the refractory ceramic product with the liquid results in some of the one or more of the alkali salts and the one or more alkaline earth salts dissolving in the liquid such that the mass % of the alkali or the alkaline earth salts in the refractory ceramic product is reduced; and
subsequent to combining the refractory ceramic product with the liquid, separating the refractory ceramic product and the liquid.

2. The method according to claim 1 , further comprising:
prior to providing the refractory ceramic product, removing the refractory ceramic lining of a rotary kiln for burning cement clinker, said lining comprising magnesia and at least one of the following salts: one or more alkali salts and one or more alkaline earth salts.

3. The method according to claim 2 , further comprising:
subsequent to removing the refractory ceramic lining of the rotary kiln for burning cement clinker and prior to providing the refractory ceramic product, comminuting the removed lining.

4. The method according to claim 3 , in which the lining is comminuted to a grain size of at least one of:
less than 50 mm; or
more than 0.1 mm.

5. The method according to claim 1 , in which the refractory ceramic product is provided in the form of bulk material.

6. The method according to claim 1 , wherein the refractory ceramic product is present to an extent of at least 90 mass %, in relation to the mass of the refractory ceramic product, with a grain size of less than 50 mm.

7. The method according to claim 1 , wherein the refractory ceramic product is present to an extent of at least 90 mass %, in relation to the mass of the refractory ceramic products, with a grain size of more than 0.1 mm.

8. The method according to claim 1 , in which the refractory ceramic product comprises a content of magnesia of at least 60 mass %, in relation to the total mass of the refractory ceramic product.

9. The method according to claim 1 , in which water is provided as the liquid.

10. The method according to claim 1 , further comprising:
combining the refractory ceramic product separated from the liquid with at least one further magnesia-based refractory ceramic raw material;
further processing the combined refractory ceramic product and the at least one further refractory ceramic raw material to provide a refractory ceramic product.

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Klitzsch Michael
• Geith Martin
• Budna Karl
• Nievoll Josef

Classifications

• C04B35/64 Primary

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

• C04B2235/66

  Specific sintering techniques, e.g. centrifugal sintering · CPC title

• C04B35/04

  based on magnesium oxide · CPC title

• C04B35/62204

  using waste materials or refuse (clay-wares containing waste materials C04B33/132) · CPC title

• C04B35/62625

  Wet mixtures · CPC title