Glass melting method

• US 5,573,564 A
• Filed: 08/10/1994
• Issued: 11/12/1996
• Est. Priority Date: 03/07/1991
• Status: Expired due to Term

• Current Assignee: Stir-Melter Incorporated
• Original Assignee: Stir-Melter Incorporated
• Inventors: Richards, Ray S.
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): VINCENT, SEAN E
• Application Number:
  US08/288,478
• Time in Patent Office: 825 Days
• Field of Search: 65/134.8, 65/134.6, 65/29.13, 65/134.3, 65/135.9, 65/135.2, 65/135.3, 65/135.4, 65/29.12, 65/29.16, 65/DIG. 13, 588/252, 588/256, 588/257
• US Class Current: 65/29.13
• CPC Class Codes: B09B 3/0066 Disposal of asbestos
• CPC Class Codes: C03B 3/00 Charging the melting furnaces
• CPC Class Codes: C03B 5/005 of glass-forming waste materials disposal or transformation of solid waste in general B09B; treatment of radioactive waste G21F9/00
• CPC Class Codes: C03B 5/027 by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
• CPC Class Codes: C03B 5/187 with moving elements
• CPC Class Codes: C03B 5/1875 of the screw or pump-action type
• CPC Class Codes: C03B 5/193 using gas, e.g. bubblers
• CPC Class Codes: C03B 5/225 Refining C03B5/18 takes precedence ; Refining agents C03C1/004
• CPC Class Codes: C03B 5/2252 under reduced pressure, e.g. with vacuum refiners
• CPC Class Codes: Y02P 40/50 Glass production, e.g. reusing waste heat during processing or shaping
• CPC Class Codes: Y10S 65/04 Electric heat

Abstract

A glass melter 30 having a mixing impeller 34 for converting a feed stream 38 supplied to a vessel 32 into a vitrified glass melt 50. Heating means such as electrodes 36 or a gas burner 58 are used to heat the glass melt 50. Electrode 36 arrangements are proposed for minimizing current flow through the impeller 34. Current flow through a special continuous circular impeller or conical pump 70 is disclosed. A cylindrical vessel 98, triangular vessel 94, square vessel 32, and hexagonal vessel 96 are disclosed. Methods of processing particular waste streams are disclosed including coated mineral fibers, ash, radioactive material, chemical waste and the like.

Claims

1. A method of vitrifying ash comprising the steps of:

depositing ash into a vessel containing a molten glass bath;

adding glass formers, glass modifiers, and fluxing agents as necessary to the molten glass bath;

stirring the molten glass bath to disperse the ash and said glass formers, glass modifiers and fluxing agents into the molten glass bath;

heating the molten glass bath to maintain the molten glass bath at a temperature above its melting point;

removing a portion of said molten glass bath from the vessel for cooling to form glass; and

monitoring emissions from the vessel for lead, zinc and cadmium and other hazardous or toxic material.

2. The method of claim 1 wherein said portion of said molten glass melt removed from the vessel is cooled to form an aggregate.

3. The method of claim 1 wherein the addition of glass formers, glass modifiers and fluxing agents is controlled in response to the monitoring of the emissions from the vessel.

4. The method of claim 1 wherein said ash is pre-mixed with said glass formers prior to supplying said ash to said vessel.

5. A method of vitrifying ash comprising the steps of:

mixing ash with glass formers, glass modifiers and fluxing agents and depositing thereof into a vessel containing a molten glass bath;

monitoring emissions from the vessel for lead, zinc and cadmium and other hazardous or toxic material;

adding glass formers, glass modifiers, and fluxing agents in a controlled manner in response to the monitoring as necessary to the molten glass bath;

controlling the glass formers, glass modifiers and fluxing agents deposited in the vessel in response to the monitoring of the emissions from the vessel;

stirring the molten glass bath to disperse the ash and said glass formers, glass modifiers and fluxing agents into the molten glass bath;

heating the molten glass bath to maintain the molten glass bath at a temperature above its melting point; and

removing a portion of said molten glass bath from the vessel for cooling to form glass.