Method for producing mixed raw material, method for producing molten glass, method for producing glass article, apparatus for producing molten glass, and apparatus for producing glass article

Patent metadata

Field	Value
Publication number	US-12338153-B2
Application number	US-202217659556-A
Country	US
Kind code	B2
Filing date	Apr 18, 2022
Priority date	Oct 23, 2019
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A mixed raw material producing method for producing a mixed raw material includes preparing a glass raw material and an aqueous solution of sodium hydroxide; causing the aqueous solution to absorb carbon dioxide gas, to deposit sodium hydrogen carbonate in the aqueous solution; and mixing the sodium hydrogen carbonate with the glass raw material, to obtain a mixed raw material to be charged into a melting furnace.

First claim

What is claimed is:

1. A method of producing a mixed raw material, comprising:
preparing a glass raw material and an aqueous solution of sodium hydroxide;
exposing the aqueous solution to carbon dioxide gas, such that the carbon dioxide gas is absorbed in the aqueous solution and sodium hydrogen carbonate is deposited in the aqueous solution;
mixing the sodium hydrogen carbonate with the glass raw material such that a mixed raw material comprising the sodium hydrogen carbonate and the glass raw material is obtained; and
heating the mixed raw material before charging the mixed raw material into a melting furnace such that the sodium hydrogen carbonate is converted to sodium carbonate and the carbon dioxide gas is released,
wherein at least a portion of the carbon dioxide gas released in the heating of the mixed raw material is absorbed in the aqueous solution.

2. The method according to claim 1 , wherein the mixed raw material is heated using heat of an exhaust gas from the melting furnace.

3. The method according to claim 1 , wherein the mixed raw material is heated at a temperature in a range of 100° C. to 900° C.

4. The method according to claim 1 , further comprising:
acquiring the carbon dioxide gas from an exhaust gas from the melting furnace.

5. The method according to claim 1 , further comprising:
granulating the mixed raw material before charging the mixed raw material into the melting furnace such that a briquette is formed.

6. The method according to claim 1 , wherein the mixed raw material is heated at a temperature of from 300° C. to 800° C.

7. The method according to claim 1 , wherein the mixed raw material is heated at a temperature of from 500° C. to 800° C.

8. The method according to claim 1 , wherein the aqueous solution forms the sodium carbonate in a first tank and deposits the sodium hydrogen carbonate in a second tank.

9. The method according to claim 1 , wherein the mixed raw material is heated at a temperature of from 300° C. to 800° C., and the aqueous solution forms the melting furnace in a first tank and deposits the melting furnace in a second tank.

10. A method for producing molten glass, comprising:
charging the mixed raw material obtained by the method of claim 1 into the melting furnace; and
melting the mixed raw material in the melting furnace such that molten glass is obtained.

11. A method for producing a glass article, comprising:
forming the molten glass obtained by the method of claim 10 ; and
annealing the formed glass, such that a glass article is obtained.

12. A method for producing molten glass, comprising:
charging the mixed raw material obtained by the method of claim 1 into the melting furnace without cooling the mixed raw material to a normal temperature; and
melting the mixed raw material in the melting furnace such that molten glass is obtained.

Assignees

• Agc Inc

Inventors

• Maehara Terutaka

Classifications

• C03B25/04

  in a continuous way · CPC title

• C03B5/235

  Heating the glass (C03B5/02, C03B5/18, C03B5/225 take precedence) · CPC title

• B01D2258/0241

  from glass manufacture plants · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2251/604

  Hydroxides · CPC title