Methods of cleaning glass

Patent metadata

Field	Value
Publication number	US-12440872-B2
Application number	US-202418661792-A
Country	US
Kind code	B2
Filing date	May 13, 2024
Priority date	May 19, 2023
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

Methods of cleaning glass comprise mixing the glass with a peroxide-containing aqueous solution and heating the glass at a temperature of about 100° C. or more. In aspects, 50 wt % of the peroxide-containing aqueous solution based on an amount of the glass is mixed with the glass. The peroxide-containing aqueous solution can be removed from the glass before the heating. Alternatively, in aspects, from 10 wt % to 50 wt % of the peroxide-containing aqueous solution based on an amount of the glass can be mixed with the glass.

First claim

What is claimed is:

1. A method of cleaning glass comprising:
cleaning the glass by mixing the glass with 50 wt % or more of a peroxide-containing aqueous solution based on an amount of the glass for a period of time, wherein the glass comprises a powder comprising a median particle size from about 1 micrometer to about 1 millimeter;
removing the peroxide-containing aqueous solution from the glass; and then
heating the glass at a temperature of about 100° C. or more.

2. The method of claim 1 , wherein the peroxide-containing aqueous solution comprises from about 5 wt % to about 30 wt % of hydrogen peroxide based on an amount of the peroxide-containing aqueous solution.

3. The method of claim 1 , wherein the mixing occurs in an oxygen-containing environment containing greater than 25 vol % oxygen.

4. The method of claim 1 , wherein the period of time for the mixing is from about 10 minutes to about 8 hours.

5. The method of claim 1 , wherein the removing comprises applying a vacuum to the mix of glass and peroxide-containing aqueous solution.

6. The method of claim 1 , wherein the removing comprises using filtration of the mix of glass and peroxide-containing aqueous solution.

7. The method of claim 1 , further comprising, after the removing the peroxide-containing aqueous solution and before the heating:
rinsing the glass with deionized water; and
removing the deionized water from the rinsed glass by applying a vacuum, using filtration, or a combination thereof.

8. The method of claim 1 , wherein the mixing occurs at a temperature less than 70° C.

9. The method of claim 1 , wherein the heating the glass comprising heating at the temperature from about 100° C. to about 350° C. for from about 1 hour to about 8 hours.

10. The method of claim 1 , wherein, after the heating, the glass comprises less than 1000 ppm carbon.

11. The method of claim 1 , wherein, using water instead of the peroxide-containing aqueous solution produces glass with 10% or more carbon than using the peroxide-containing aqueous solution.

12. The method of claim 2 , wherein the peroxide-containing aqueous solution comprises from about 0.1 wt % to about 5 wt % of a surfactant based on the amount of the peroxide-containing aqueous solution.

13. A method of cleaning glass comprising:
cleaning the glass by mixing the glass with from 10 wt % to 50 wt % of a peroxide-containing aqueous solution based on an amount of the glass for a period of time, wherein the glass comprises a powder comprising a median particle size from about 1 micrometer to about 1 millimeter; and then
heating the glass at a temperature of about 100° C. or more.

14. The method of claim 13 , wherein the peroxide-containing aqueous solution comprises from about 5 wt % to about 30 wt % of hydrogen peroxide based on an amount of the peroxide-containing aqueous solution.

15. The method of claim 13 , wherein the mixing occurs for the period of time from about 10 minutes to about 4 hours at a temperature less than 70° C.

16. The method of claim 13 , wherein the heating occurs at the temperature from about 100° C. to about 350° C. for from about 1 hour to about 4 hours.

17. The method of claim 13 , wherein, after the heating, the glass comprises less than 1000 ppm carbon.

Assignees

• Corning Inc

Inventors

• Deng Huayun
• Fan Deqiu
• He Mingqian
• Niu Weijun

Classifications

• B08B3/14

  Removing waste, e.g. labels, from cleaning liquid · CPC title

• B08B7/0071

  by heating (B08B7/0035 takes precedence) · CPC title

• C03C12/00

  Powdered glass (C03C8/02 takes precedence); Bead compositions · CPC title

• C03C23/0075

  Cleaning of glass (specially adapted to plate glass B08B11/00) · CPC title

• B08B3/08 Primary

  the liquid having chemical or dissolving effect · CPC title