Patent US3615346A successfully refreshed from Google Patents.
US3615346A
Expired / Lapsed
US
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Process for production of metals in an electric furnace
Assignee: Demag Elektrometallurgie GmbH
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Filing: 1968-08-23
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Granted: 1971-10-26
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Expires: 1988-08-23
Abstract
Abstract In the production of metals and metal alloys from a charge of material containing at least one of manganese, silicon, and chromium, the charge of material is disposed within a closed combustion chamber and combustion air is directed into the closed space in a volume based on the conditions existing therein. A sufficient amount of combustion air is supplied to completely burn all of the CO in the reduction gases to form CO2. The amount of combustion air supplied to the closed combustion space is in excess of the amount required to effect the complete combustion of the CO2. Further, during the reduction operation, the charge is worked by stirring means or the like to assure the permeability of its surface for the release of the reduction gases.
Inventors
- 👤 Johannes A Reth
- 👤 Winfried H Fettweis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:22
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; C21C5/527; C21C5/5211; C21C5/5264; C21C7/00; C22; C22B; C22B4/00; F; F27; F27B; F27B3/00; F27B3/08; F27B3/085; F27B3/10; F27D; F27D27/00; F27D19/00; F27D2019/0006; F27D2019/0018; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A process, as claimed in claim 1, wherein the step of checking such at least one parameter comprises continuously measuring the temperature of the waste gases at their outlet from the furnace chamber.
Claim 2
Dependent Claim
43 words
A process, as claimed in claim 1, wherein the step of checking such at least one parameter comprises continuously analyzing the waste gases flowing out of the outlet from the furnace chamber to determine the percentage of complete combustion of the reduction gas.
Claim 3
Dependent Claim
43 words
A process, as claimed in claim 2, wherein the step of checking such at least one parameter comprises continuously analyzing the waste gases flowing out of the outlet from the furnace chamber to determine the percentage of complete combustion of the reduction gas.
Claim 4
Dependent Claim
50 words
A process, as claimed in claim 1, wherein the step of continuously measuring the chamber temperature at spaced points over the surface of the charge is effected by measuring the radiant heat at such points to determine differences in the distribution of radiant heat over the surface of the charge.
Claim 5
Dependent Claim
39 words
A process, as claimed in claim 1, including the step of limiting the mechanical loosening to areas over the surface of the charge other than those areas immediately surrounding the furnace electrodes to avoid damage to the furnace electrodes.
Claim 6
Dependent Claim
27 words
A process, as claimed in claim 1, in which such mechanical loosening is effected at successive points around the circumference of circular areas of the charge surface.
Claim 7
Dependent Claim
41 words
A process, as claimed in claim 1, in which such mechanical loosening is effected in accordance with the temperature gradient over the surface of the charge as determined by such temperature measure at spaced points over the surface of the charge.
Claim 8
Dependent Claim
58 words
A process, as claimed in claim 8, in which suCh mechanical loosening is effected at the furnace region having the maximum temperature in accordance with such temperature distribution; and further including the steps of concentrating the temperature measurements at such region and then effecting the mechanical loosening at those points within such region having the highest local temperatures.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |