Patent US4572281A successfully refreshed from Google Patents.
US4572281A
Expired / Lapsed
US
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Method and arrangement for recovering the sensible heat of slag
Assignee: COEST-ALPINE AKTIENGESELLSCHAFT A Co OF AUSTRIA
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Filing: 1983-11-14
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Granted: 1986-02-25
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Expires: 2003-11-14
Abstract
Abstract To recover the sensible heat of slag the slag is allowed to solidify on the surface of a hollow cooling body provided with a liquid internal cooling and is indirectly cooled by the liquid internal cooling. The liquid cooling medium of the liquid internal cooling is guided in a thermodynamic cyclic process. In order to ensure as completely a recovery of the sensible heat of the slag as possible and a high percentage of glassy portions of the slag as well as a good grindability of the slag, the liquid slag on the surface of the cooling body is intensively cooled indirectly by the liquid cooling medium to a temperature of closely below the solidification temperature in a first cooling step. The solidified slag separated from the surface of the cooling body is then directly cooled by a gas flow in a second cooling step. The heated gas flow also is guided in a thermodynamic cyclic process.
Inventors
- 👤 Paul Mullner
- 👤 Bernhard Enkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:23
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; F; F28; F28D; F28D7/00; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/026; C21B2400/05; C21B2400/066; C21B2400/074; C21B2400/08; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
In a method for recovering the sensible heat of slag, such as blast furnace slag, in which slag in a liquid state is solidified on the surface of a hollow cooling body, preferably designed as a cooling drum, and provided with a liquid internal cooling means comprising a liquid cooling medium, said slag being indirectly cooled by said liquid internal cooling, and said liquid cooling medium of said liquid internal cooling means is guided in a liquid-cooling-medium thermodynamic cyclic process, the improvement comprising the steps of indirectly intensively cooling the liquid slag on the surface of said cooling body by said liquid cooling medium to a temperature closely below the solidification temperature in a first cooling step so as to solidify said slag throughout, separating said solidified slag from the surface of said cooling body, obtaining a heated gas flow by directly cooling said separated solidified slag in a second cooling step by a gas flow, and leading said heated gas flow in a gas-flow thermodynamic cyclic process.
Claim 2
Dependent Claim
168 words
In a method for recovering the sensible heat of slag, such as blast furnace slag, in which slag in a liquid state is solidified on the surface of a hollow cooling body, preferably designed as a cooling drum, and provided with a liquid internal cooling means comprising a liquid cooling medium, said slag being indirectly cooled by said liquid internal cooling, and said liquid cooling medium of said liquid internal cooling means is guided in a liquid-cooling-medium thermodynamic cyclic process, the improvement comprising the steps of indirectly intensively cooling the liquid slag on the surface of said cooling body by said liquid cooling medium to a temperature closely below the solidification temperature in a first cooling step so as to solidify said slag throughout, separating said solidified slag from the surface of said cooling body, obtaining a heated gas flow by directly cooling said separated solidified slag in a second cooling step by a gas flow, and leading said heated gas flow in a gas-flow thermodynamic cyclic process.
Claim 3
Dependent Claim
37 words
A method as set forth in claim 1, wherein said slag is cooled to about 1,100° C. by said liquid cooling medium and is cooled from about 1,100° C. to about 200° C. by said gas flow.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 1, wherein the heat absorbed by said gas flow is supplied to said liquid cooling medium heated by said slag.
Claim 5
Dependent Claim
23 words
A method as set forth in claim 1, wherein said liquid cooling medium is guided in a closed cycle at an elevated pressure.
Claim 6
Dependent Claim
18 words
A method as set forth in claim 1, wherein said gas flow is guided in a closed cycle.
References Cited (Backward Citations)
JPS5334038A
Cited
JPS5384894A
Cited
US4362504A
Cited
US4373907A
Cited
FR2498310A1
Cited
US4420304A
Cited
EP0068943A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |