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US4720295A
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Controlled process for making a chemically homogeneous melt for producing mineral wool insulation
Assignee: Individual
•
Filing: 1986-10-20
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Granted: 1988-01-19
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Expires: 2006-10-20
Abstract
Abstract A process for making a homogeneous melt for producing mineral wool insulation. This insulating material is made from waste products namely, bottom ash, cement kiln dust, slag, and waste from mineral wool production. These materials, along with a binder, are homogenized into a mixture. Thereafter, the process includes briquetting the mixture into agglomerated pieces. The agglomerates are then melted in a cupola furnace and the molten agglomerate is discharged into a receiver. Hot combustion gases are then passed into the melt or molten agglomerate to chemically homogenize the melt and heat the melt to preselected temperature. Thereafter, the melt is converted into fibers using conventional practices.
Inventors
- 👤 Boris Bronshtein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:17
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B5/00; C03B5/16; C03C; C03C1/00; C03C1/002; C03C13/00; C03C13/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A controlled method for making a chemically homogeneous melt for producing light-colored mineral wool which comprises: (a) physically homogenizing a mixture of the following formula: ______________________________________
Ingredient % By Weight
______________________________________
Mineral Wool Production Waste (≦3/4")
20-50
Cement Kiln Dust 15-25
Clay 12-20
Blast Furnace Slag (≦3/4")
10-40
Dolomite (≦3/4")
0-10
Portland Cement 3-5
Ground Portion of said 5-10
wool production waste
(<150 microns)
______________________________________ (b) briquetting said mixture into agglomerate pieces of predetermined size and shape to a density of 125 to 160 lbs./ft 3 ; (c) melting said agglomerate in a cupola furnace; (d) discharging the molten agglomerate into a receiver; (e) passing hot combustion gases into said melt to chemically homogenize the melt and heat the melt to a predetermined temperature; and (f) converting said melt into fibers.
Claim 2
Dependent Claim
131 words
A controlled method for making a chemically homogeneous melt for producing light-colored mineral wool which comprises: (a) physically homogenizing a mixture of the following formula: ______________________________________
Ingredient % By Weight
______________________________________
Mineral Wool Production Waste (≦3/4")
20-50
Cement Kiln Dust 15-25
Clay 12-20
Blast Furnace Slag (≦3/4")
10-40
Dolomite (≦3/4")
0-10
Portland Cement 3-5
Ground Portion of said 5-10
wool production waste
(<150 microns)
______________________________________ (b) briquetting said mixture into agglomerate pieces of predetermined size and shape to a density of 125 to 160 lbs./ft 3 ; (c) melting said agglomerate in a cupola furnace; (d) discharging the molten agglomerate into a receiver; (e) passing hot combustion gases into said melt to chemically homogenize the melt and heat the melt to a predetermined temperature; and (f) converting said melt into fibers.
Claim 3
Dependent Claim
130 words
A controlled method for making a chemically homogeneous melt for producing a light-colored mineral wool which comprises (a) physically homogenizing a mixture of the following formula: ______________________________________
Ingredient % By Weight
______________________________________
Cement kiln dust 20-25
Mineral wool production waste
25-45
Silica sand 5-10
Blast furnace slag (≦3/4")
10-40
Binder:
Portland Cement 3-5
Ground portion of said
5-10
wool production waste
(<150 microns)
______________________________________ (b) compacting said mixture into agglomerate pieces of predetermined size and shape to a density of 125 to 160 lbs./ft 3 ; (c) melting said agglomerate in a cupola furnace; (d) discharging the molten agglomerate into a receiver; (e) passing hot combustion gases into said melt to chemically homogenize the melt and heat the melt to a predetermined temperature; and (f) converting said melt into fibers.
Claim 4
Dependent Claim
130 words
A controlled method for making a chemically homogeneous melt for producing a light-colored mineral wool which comprises (a) physically homogenizing a mixture of the following formula: ______________________________________
Ingredient % By Weight
______________________________________
Cement kiln dust 20-25
Mineral wool production waste
25-45
Silica sand 5-10
Blast furnace slag (≦3/4")
10-40
Binder:
Portland Cement 3-5
Ground portion of said
5-10
wool production waste
(<150 microns)
______________________________________ (b) compacting said mixture into agglomerate pieces of predetermined size and shape to a density of 125 to 160 lbs./ft 3 ; (c) melting said agglomerate in a cupola furnace; (d) discharging the molten agglomerate into a receiver; (e) passing hot combustion gases into said melt to chemically homogenize the melt and heat the melt to a predetermined temperature; and (f) converting said melt into fibers.
Claim 5
Dependent Claim
22 words
The method of claim 2 which includes 5% by weight of igneous rock based upon the total weight of the compacted agglomerate.
Claim 6
Dependent Claim
38 words
The method of claim 1 which includes incorporating into said mixture fine coke or coal having a particle size 71/2" or less in the amount of 10-15% based upon the total weight of the ingredients in the mixture.
Claim 7
Dependent Claim
38 words
The method of claim 2 which includes incorporating into said mixture fine coke or coal having a particle size 71/2" or less in the amount of 10-15% based upon the total weight of the ingredients in the mixture.
Claim 8
Dependent Claim
16 words
The method of claim 2 in which said compacting step is carried out by vibro pressing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |