US3899320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making iron sponge pellets containing silicon carbide
Assignee: Elektroschmelzwerk Kempten GmbH
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Filing: 1974-02-25
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Granted: 1975-08-12
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Expires: 1994-02-25
Abstract
Abstract A process for making iron sponge from iron ores containing at least 95 percent by weight of iron oxide, which comprises pulverizing the iron ore and adding silicon carbide thereto, pelletizing the mixture, and subjecting it to direct reduction. The invention also relates to various uses of the iron sponge so made.
Inventors
- 👤 Theodor Benecke
- 👤 Gunter Wiebke
- 👤 Carl Pfannenschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:45
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2406; C21; C21B; C21B13/00; C21B13/008; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
A PROCESS FOR MAKING IRON SPONGE FROM IRON ORES CONTAINING AT LEAST 95% BY WEIGHT OF IRON OXIDE COMPRISING, PULVERIZING THE IRON ORE TO EXTREMELY FINE GRAIN SIZE, MIXING THE PULVERIZED IRON ORE WITH FINE-GRAINED SILICON CARBIDE, PELLETIZING THE SO OBTAINED MIXTURE, AND SUBJECTING THE SAME TO DIRECT REDUCTION.
Claim 2
Dependent Claim
49 words
A PROCESS FOR MAKING IRON SPONGE FROM IRON ORES CONTAINING AT LEAST 95% BY WEIGHT OF IRON OXIDE COMPRISING, PULVERIZING THE IRON ORE TO EXTREMELY FINE GRAIN SIZE, MIXING THE PULVERIZED IRON ORE WITH FINE-GRAINED SILICON CARBIDE, PELLETIZING THE SO OBTAINED MIXTURE, AND SUBJECTING THE SAME TO DIRECT REDUCTION.
Claim 3
Dependent Claim
42 words
The process according to claim 1 wherein the silicon carbide is mixed with the pulverized iron ore in a grain size approximately corresponding to the grain size of the iron ore, the obtained mixture is pelletized and the obtained pellets are sintered.
Claim 4
Dependent Claim
27 words
The process according to claim 1 wherein at least 80 percent by weight of iron ores are used having a grain size less than 40 Mu .
Claim 5
Dependent Claim
34 words
The process according to claim 3 wherein silicon carbide is used in an amount of 0.1-10 percent by weight calculated on the total weight and in a grain size between 10 Mu and 2mm.
Claim 6
Dependent Claim
38 words
The process according to claim 4 wherein silicon carbide is used in an amount of 0.5 - 6 percent by weight calculated on the total weight and in a grain size of 10 Mu to 400 Mu .
References Cited (Backward Citations)
US3765875A
Cited
US3728107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |