Refractory block and glass-melting furnace

Patent metadata

Field	Value
Publication number	US-10584065-B2
Application number	US-201615552914-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 24, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A molten refractory product having the following average chemical composition, in wt % on the basis of oxides and for a total of 100%: Al 2 O 3 : balance to 100%; Fe 2 O 3 : 0.6%-5.0% and/or TiO 2 : 1.5%-10.0%; Fe 2 O 3 +TiO 2 ≤10.0%; Na 2 O+K 2 O: 1.0%-8.0%; SiO 2 : 0.2%-2.0%; CaO+BaO+SrO: ≤0.5%; Other oxide species: ≤1.5%. Also, a glass-melting furnace and the use of the refractory product in the glass-melting furnace.

First claim

The invention claimed is:

1. A molten refractory product having the following average chemical composition, as weight percentages on the basis of oxides and for a total of 100%:
Al 2 O 3 : balance to 100%;
Fe 2 O 3 : 0.6%-5.0% and/or TiO 2 : 1.5%-10.0%;
provided that Fe 2 O 3 +TiO 2 ≤10.0%;
Na 2 O+K 2 O: 1.0%-8.0%;
SiO 2 : 0.2%-2.0%;
CaO+BaO+SrO: ≤0.5%;
oxide species other than Al 2 O 3 , Fe 2 O 3 , TiO 2 , Na 2 O, K 2 O, SiO 2 , CaO, BaO and SrO: ≤1.5%.

2. The product as claimed in claim 1 , wherein the content of Fe 2 O 3 +TiO 2 is less than or equal to 8.0%.

3. The product as claimed in claim 1 , wherein the content of Fe 2 O 3 is less than or equal to 3.0%.

4. The product as claimed in claim 1 , wherein the content of TiO 2 is less than or equal to 6.0%.

5. The product as claimed in claim 1 , wherein the content of TiO 2 is between 2.5%-5.0% and the content of Fe 2 O 3 +TiO 2 is between 2.5%-6.0%.

6. The product as claimed in claim 1 , wherein the content of Fe 2 O 3 is between 1.0%-3.0% and the content of TiO 2 is between 2.0%-4.0%.

7. The product as claimed in claim 1 , wherein the content of SiO 2 is less than or equal to 1.0%.

8. The product as claimed in claim 1 , wherein the content of Na 2 O+K 2 O is less than or equal to 7.0%.

9. The product as claimed in claim 1 , which is in the form of a block having a weight of more than 10 kg.

10. A glass-melting furnace, comprising a product as claimed in claim 1 .

11. The furnace as claimed in claim 10 , wherein said product is arranged in a superstructure.

Assignees

• Saint Gobain Ct Recherches
• Centre Nat Rech Scient

Inventors

• Gaubil Michel
• Bouvry Benjamin
• Citti Olivier
• Lechevalier David

Classifications

• C04B2235/3272

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

• C04B35/653

  Processes involving a melting step · CPC title

• C04B2235/3232

  Titanium oxides or titanates, e.g. rutile or anatase · CPC title

• C04B35/101

  Refractories from grain sized mixtures · CPC title

• C04B35/107 Primary

  Refractories by fusion casting · CPC title