US4407972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erosion-resistant refractory
Assignee: Armco Steel Co LP
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Filing: 1983-01-26
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Granted: 1983-10-04
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Expires: 2003-01-26
Abstract
Abstract A refractory shape having improved resistance to erosion in metal melting vessels and high modulus of rupture, comprising an anhydrous refractory material, an anhydrous organic binder, from 0.3% to about 30% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 10% particulate elemental magnesium, based on the weight of the refractory shape. Addition of both elemental carbon and elemental magnesium results in a synergistic improvement in slag erosion resistance.
Inventors
- 👤 Bohus Brezny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/01; C04B35/013; C04B35/632; C04B35/66; C04B2111/00; C04B2111/00474; C04B2111/0087; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/42; C04B2235/422; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
A chemically bonded refractory shape having improved resistance to erosion for use in a steel making plant wherein the hot face of the shape is subjected to temperatures of at least about 1600° C. and the cold face is shielded from oxygen penetration, consisting essentially of an anhydrous refractory material, an anhydrous organic binder in an amount sufficient to bond said refractory material, from 0.3% to about 3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 3.5% particulate elemental magnesium, based on the total weight of the refractory shape.
Claim 2
Dependent Claim
101 words
A chemically bonded refractory shape having improved resistance to erosion for use in a steel making plant wherein the hot face of the shape is subjected to temperatures of at least about 1600° C. and the cold face is shielded from oxygen penetration, consisting essentially of an anhydrous refractory material, an anhydrous organic binder in an amount sufficient to bond said refractory material, from 0.3% to about 3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 3.5% particulate elemental magnesium, based on the total weight of the refractory shape.
Claim 3
Dependent Claim
45 words
The refractory shape claimed in claim 1, containing from about 0.5% to about 2.7% elemental carbon in the form of graphite or carbon black having a particle size ranging from about 0.05 to about 0.08 mm, and from about 0.5% to about 3.0% elemental magnesium.
Claim 4
Dependent Claim
22 words
The refractory shape claimed in claim 1, wherein the sum total of elemental carbon plus elemental magnesium is at least about 2.0%.
Claim 5
Dependent Claim
31 words
The refractory shape claimed in claim 1, wherein said refractory material is derived from at least one of magnesia, doloma, and alumina, and said binder is coal tar or petroleum pitch.
Claim 6
Dependent Claim
25 words
The refractory shape claimed in claim 4, containing about 3% to about 5% of said pitch, based on the total weight of the refractory shape.
Claim 7
Dependent Claim
20 words
The refractory shape claimed in claim 1, wherein said elemental magnesium has a particle size up to about 0.50 mm.
Claim 8
Dependent Claim
28 words
The refractory shape claimed in claim 1, wherein said organic binder comprises about 3% to about 5% anhydrous resin, based on the total weight of the refractory shape.
Claim 9
Dependent Claim
19 words
The refractory shape claimed in claim 1, wherein said shape is a brick used in a steel making plant.
Claim 10
Dependent Claim
101 words
A chemically bonded refractory brick which, during service in a metal melting vessel, develops a dense zone of magnesium oxide within said brick adjacent the hot face thereof, said hot face being subjected to temperatures of at lest about 1600° C., said brick consisting essentially of an anhydrous refractory material, an anhydrous organic binder in an amount sufficient to bond said refractory material, from 0.3% to about 3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 3.5% particulate elemental magnesium, based on the total weight of the refractory brick.
Claim 11
Dependent Claim
101 words
A chemically bonded refractory brick which, during service in a metal melting vessel, develops a dense zone of magnesium oxide within said brick adjacent the hot face thereof, said hot face being subjected to temperatures of at lest about 1600° C., said brick consisting essentially of an anhydrous refractory material, an anhydrous organic binder in an amount sufficient to bond said refractory material, from 0.3% to about 3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and from 0.3% to about 3.5% particulate elemental magnesium, based on the total weight of the refractory brick.
Claim 12
Dependent Claim
44 words
The brick claimed in claim 9, containing from about 0.5% to about 2.7% elemental carbon in the form of graphite or carbon black having a particle size ranging from about 0.05 to about 0.08 mm, and from about 0.5% to about 3.0% elemental magnesium.
Claim 13
Dependent Claim
30 words
The brick claimed in claim 9, wherein said refractory material is derived from at least one of magnesia, doloma, and alumina, and said binder is coal tar or petroleum pitch.
Claim 14
Dependent Claim
24 words
The brick claimed in claim 11, containing about 3% to about 5% of said pitch, based on the total weight of the refractory brick.
Claim 15
Dependent Claim
20 words
The brick claimed in claim 9, wherein said elemental magnesium has a particle size ranging up to about 0.05 mm.
Claim 16
Dependent Claim
16 words
The brick claimed in claim 9, wherein said metal melting vessel is a steel making plant.
Claim 17
Independent Claim
78 words
A method of increasing resistance to erosion of refractory linings which comprises mixing an anhydrous refractory material, an anhydrous organic binder therefor, at least 0.3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and at least 0.3% particulate elemental magnesium, based on the total weight of the refractory mix, forming the mixture into bricks, and positioning said bricks in a melting vessel at least in regions thereof subject to severe erosion.
Claim 18
Independent Claim
78 words
A method of increasing resistance to erosion of refractory linings which comprises mixing an anhydrous refractory material, an anhydrous organic binder therefor, at least 0.3% finely divided elemental carbon having a particle size ranging from 0.01 to about 1 mm, and at least 0.3% particulate elemental magnesium, based on the total weight of the refractory mix, forming the mixture into bricks, and positioning said bricks in a melting vessel at least in regions thereof subject to severe erosion.
Claim 19
Dependent Claim
31 words
The method claimed in claim 15, wherein from 0.3% to about 3% elemental carbon and from 0.3% to about 3.5% elemental magnesium are mixed with said refractory material and said binder.
Claim 20
Dependent Claim
45 words
The method claimed in claim 15, wherein from about 0.5% to about 2.7% elemental carbon having a particle size ranging from about 0.05 to about 0.08 mm, and from about 0.5% to about 3.0% elemental magnesium are mixed with said refractory material and said binder.
Claim 21
Dependent Claim
30 words
The method claimed in claim 15, wherein said organic binder comprises about 3% to about 5% coal tar or petroleum pitch, based on the total weight of the refractory mix.
Claim 22
Dependent Claim
27 words
The method claimed in claim 15, wherein said organic binder comprises about 3% to about 5% anhydrous resin, based on the total weight of the refractory mix.
Claim 23
Dependent Claim
15 words
The method claimed in claim 15, wherein said melting vessel is a steel making plant.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |