Process and apparatus for remelting scrap glass

• US 4,309,204 A
• Filed: 11/19/1979
• Issued: 01/05/1982
• Est. Priority Date: 11/19/1979
• Status: Expired due to Term

• Current Assignee: Owens- Corning Fiberglas Technology Incorporated (Owens Corning)
• Original Assignee: Owens-Corning Fiberglas Corporation
• Inventors: Brooks, Robert
• Primary Examiner(s): Marcus, Michael S.
• Application Number:
  US06/095,197
• Time in Patent Office: 778 Days
• Field of Search: 165/28, 165/121, 165/134, 165/135, 165/137, 165/335, 165/165
• US Class Current: 65/474
• CPC Class Codes: C03B 3/02 combined with preheating, premelting or pretreating the glass-making ingredients, pellets or cullet
• CPC Class Codes: Y02P 40/50 Glass production, e.g. reusing waste heat during processing or shaping

Abstract

A process and apparatus for remelting scrap glass fibers is disclosed. The removal of binder and remelting of the scrap are carried out in one operation, and the resulting molten scrap fibers are fed directly into a conventional glass melting furnace. Granular raw glass batch also is fed into the glass melting furnace.

Claims

1. A process for recycling scrap glass including the steps of:

feeding scrap glass to a scrap glass melting furnace;

maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes;

converting the scrap glass to a molten glass; and

feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, including the step of maintaining a temperature gradient between the top and bottom of the scrap furnace wherein the top of the scrap melter is up to 600°

F. cooler than the bottom.

2. A process according to claim 1 where the granular raw glass batch is fed in agglomerated form.

3. A process according to claim 1 wherein the molten scrap glass is 5 to 50% by weight of the total glass batch being fed to the glass melting furnace.

4. A process according to claim 3 wherein percent by weight of molten scrap glass ranges from 5 to 25.

5. A process according to claim 1 wherein the scrap glass is fed into the top of the scrap melter in the form of scrap glass fibers;

wherein the temperature pyrolizes any organic binder or size but does not melt the scrap glass;

melting the scrap glass in the lower portion of the scrap melter; and

removing molten glass from the bottom of the scrap melter.

6. A process according to claim 1 or 5 including the steps of:

melting and refining the glass batch including the molten scrap glass in the glass melting furnace; and

transferring the molten glass to a fiberizing device and converting the molten glass into glass fibers by attenuating glass streams leaving the fiberizing device.

7. A process for recycling scrap glass including the steps of:

feeding scrap glass to a scrap glass melting furnace;

maintaining oxidizing conditions within the scrap furnace so as to burn-off organic binders or sizes;

converting the scrap glass to a molten glass; and

feeding the molten glass to a glass melting furnace which is also being fed granular raw glass batch, wherein the top of the scrap melter is maintained at 2200°

F. and the bottom at 2500°

F., thereby maintaining a temperature gradient therebetween.