US3687437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical furnaces or vessels
Assignee: Dynamit Nobel AG
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Filing: 1970-08-19
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Granted: 1972-08-29
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Expires: 1990-08-19
Abstract
Abstract A metallurgical furnace or vessel is provided with a refractory lining consisting of an outer layer of tamped granular ceramic material and an inner layer, which forms a protective sheathing for the outer layer and consists of bricks made of fused lime, fused dolomite, chrome magnesite, or fused magnesia. The tamped layer of ceramic material may consist of fused magnesia or stabilized zirconium oxide or alternatively of granular quartzite, corumdum, mullite or spinel. In the latter case, an intermediate layer is provided between the tamped layer and the inner brick layer to prevent reaction between the bricks and the tamped material. The intermediate layer consists of fused magnesia or stabilized zirconium oxide.
Inventors
- 👤 Wilhelm Anton Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:08
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0006; F27B; F27B14/00; F27B14/08; F27B14/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
In a metallurgical furnace or vessel, an improved reFractory lining including an inner layer, an outer layer and an intermediate layer, said outer layer being of tamped granular quartzite corundum, mullite or spinel, said inner layer being of bricks made of fused lime, fused dolomite, chrome magnesite or fused magnesia, and said intermediate layer being of fused magnesia or stabilized zirconium oxide, said inner layer forming a protective sheathing for said intermediate layer and said outer layer.
Claim 2
Dependent Claim
46 words
A furnace or vessel as claimed in claim 1, wherein said inner layer includes a lower part of fused lime bricks for contacting molten metal in said furnace or vessel and an upper part of fused dolomite bricks for contacting slag in said vessel or furnace.
Claim 3
Dependent Claim
46 words
A furnace or vessel as claimed in claim 2, wherein said inner layer includes a lower part of fused lime bricks for contacting molten metal in said furnace or vessel and an upper part of fused dolomite bricks for contacting slag in said vessel or furnace.
Claim 4
Dependent Claim
50 words
A furnace or vessel as claimed in claim 1, wherein said inner layer includes a lower part of fused lime bricks or fused dolomite bricks for contacting molten metal in said furnace or vessel and an upper part of fused magnesia bricks for contacting slag in said furnace or vessel.
Claim 5
Dependent Claim
50 words
A furnace or vessel as claimed in claim 2, wherein said inner layer includes a lower part of fused lime bricks or fused dolomite bricks for contacting molten metal in said furnace or vessel and an upper part of fused magnesia bricks for contacting slag in said furnace or vessel.
Claim 6
Dependent Claim
47 words
A furnace or vessel as claimed in claim 1, wherein said outer layer consists of fused magnesia containing at least 90 percent MgO and having a grain size distribution of 50 percent below 0.5mm and 50 percent between 1 and 4mm, said fused magnesia being tamped dry.
Claim 7
Dependent Claim
47 words
A furnace or vessel as claimed in claim 2, wherein said outer layer consists of fused magnesia containing at least 90 percent MgO and having a grain size distribution of 50 percent below 0.5mm and 50 percent between 1 and 4mm, said fused magnesia being tamped dry.
Claim 8
Dependent Claim
39 words
A furnace or vessel as claimed in claim 7, wherein said outer layer has the following grain size distribution: 30% up to 0.12 mm 20% 0.25 to 0.5 mm 25% 1 to 2 mm 25% 2 to 4 mm
Claim 9
Dependent Claim
39 words
A furnace or vessel as claimed in claim 8, wherein said outer layer has the following grain size distribution: 30% up to 0.12 mm 20% 0.25 to 0.5 mm 25% 1 to 2 mm 25% 2 to 4 mm
Claim 10
Dependent Claim
29 words
A furnace or vessel as claimed in claim 1, further including dry fused magnesia of a grain size less than 0.12 mm between said bricks in said inner layer.
Claim 11
Dependent Claim
21 words
A furnace or vessel as claimed in claim 1, wherein said inner layer has a thickness of at least 40 mm.
Claim 12
Dependent Claim
21 words
A furnace or vessel as claimed in claim 2, wherein said inner layer has a thickness of at least 40 mm.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |