US4032121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of iron from iron ores and apparatus for carrying out said process
Assignee: Voestalpine AG
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Filing: 1975-12-15
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Granted: 1977-06-28
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Expires: 1995-12-15
Abstract
Abstract A process and apparatus for the production of iron from iron ores, in which the ore is being heated and reduced in a rotary kiln by a treatment with solid carbon and with flame gas flowing in a countercurrent, the reduced iron is being collected and overheated in a first hearth furnace and is being fed in batches into a second hearth furnace, and is being converted there to pig iron, cast iron or steel, characterized in that the hot exhaust gases formed in the second hearth furnace are passed into the first hearth furnace and then through the rotary kiln together with the hot exhaust gases produced in the first hearth furnace.
Inventors
- 👤 Kurt Stift
- 👤 Helwig Vacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:28
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/10; C21B13/08; C21B13/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
Apparatus for the production of iron from iron ores comprising: a rotary kiln for reducing iron ore with carbon, said kiln having a discharge end for discharging a mixture of iron, slag and unreduced ore; a first hearth furnace for receiving the discharge from the discharge end of the kiln, said furnace having opposed side walls and end walls, one of which comprises a weir, which walls extend between the side walls, said weir having a lower height adjacent one side wall; a second hearth furnace separated from the first furnace by said weir and in communication with the first furnace above said weir; and means mounting said furnaces for tilting movement about a common axis extending through the plane of the wall comprising the weir so that fluid material can be transferred from the first furnace to the second furnace by tilting said furnaces in a direction to lower the position of said weir.
Claim 2
Dependent Claim
155 words
Apparatus for the production of iron from iron ores comprising: a rotary kiln for reducing iron ore with carbon, said kiln having a discharge end for discharging a mixture of iron, slag and unreduced ore; a first hearth furnace for receiving the discharge from the discharge end of the kiln, said furnace having opposed side walls and end walls, one of which comprises a weir, which walls extend between the side walls, said weir having a lower height adjacent one side wall; a second hearth furnace separated from the first furnace by said weir and in communication with the first furnace above said weir; and means mounting said furnaces for tilting movement about a common axis extending through the plane of the wall comprising the weir so that fluid material can be transferred from the first furnace to the second furnace by tilting said furnaces in a direction to lower the position of said weir.
Claim 3
Dependent Claim
26 words
Apparatus as in claim 1 wherein that side wall of the second furnace which is adjacent the higher portion of the weir includes a pour aperture.
Claim 4
Dependent Claim
50 words
Apparatus as in claim 1 wherein said tilting axis of the furnace is in alignment with the rotary axis of the kiln and wherein said kiln and furnaces are in sealing engagement with each other so that exhaust gases from the furnaces pass into the discharge end of said kiln.
Claim 5
Dependent Claim
27 words
Apparatus as in claim 1 wherein said first and second hearth furnaces include a top wall in the form of an arched roof common to both furnaces.
Claim 6
Dependent Claim
25 words
Apparatus as in claim 1 wherein the hearth of the second furnace is disposed at a lower level than the hearth of the first furnace.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |