US3687430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for desulfurizing pig iron
Assignee: Rheinstahl Huettenwerke AG
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Filing: 1970-09-04
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Granted: 1972-08-29
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Expires: 1990-09-04
Abstract
Abstract Pig iron in the tap spout of a blast furnace is desulfurized by passing it through a vessel containing a rotating inverted Tshaped stirring element which mixes the pig iron and a desulfurizing agent as they pass from the inlet to the outlet of the vessel. From the outlet, a trough conveys the treated pig iron to a flue with an overflow edge located at a level above the bottom surface of the outlet. The flue is arranged to separate the pig iron from the spent desulfurizing agent.
Inventors
- 👤 Hans-Peter Schulz
- 👤 Jorn Mandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
Apparatus for desulfurizing pig iron, as set forth in claim 1, whErein said stirring member has a vertically depending shaft part, and a horizontally arranged beam-shaped stirring part attached to the lower end of said shaft part and combining therewith to form an inverted T-shaped structure, the stirring part 9 is sheathed in refractory material.
Claim 2
Dependent Claim
98 words
Apparatus for desulfurizing pig iron, as set forth in claim 2, wherein the bottom surface of said inlet for pig iron is located substantially at the level of the bottom interior surface of said vessel, the upper surface of said inlet is located below the level of the overflow edge and the upper surface of the outlet is located slightly above the level of the overflow edge of said flue for the pig iron, and an opening for supplying desulfurizing agent into the vessel is located in the upper surface thereof above the level of the pig iron.
Claim 3
Dependent Claim
60 words
Apparatus for desulfurizing pig iron, as set forth in claim 1, wherein the upper surface of the outlet from said vessel is located slightly above the level of the overflow edge of said flue, and the inlet for the pig iron is arranged in the upper surface of the vessel above the upper surface of the outlet from said vessel.
Claim 4
Dependent Claim
79 words
Apparatus for desulfurizing pig iron, as set forth in claim 1, wherein the interior bottom surface of said vessel and the lower surface of the outlet form a smooth continuous surface and the interior bottom of the vessel and the lower surface of the outlet are slightly inclined downwardly in the direction from the inlet to the outlet, and the opposed surfaces of the outlet as they proceed outwardly from the interior of said vessel are in diverging relationship.
Claim 5
Dependent Claim
47 words
Apparatus for desulfurizing pig iron, as set forth in claim 2, wherein the lower surface of said beam-shaped stirring part of said stirring member is positioned closely above the interior bottom surface of the vessel in the range of about 2-10 cm above the interior bottom surface.
Claim 6
Dependent Claim
42 words
Apparatus for desulfurizing pig iron, as set forth in claim 2, wherein with said vessel having an inside diameter of more than 1.5 m, the length of said beam-shaped stirring part is 0.35 to 0.45 times the inside diameter of said vessel.
Claim 7
Dependent Claim
42 words
Apparatus for desulfurizing pig iron, as set forth in claim 2, wherein with said vessel having an inside diameter of less than 1.5 m, the length of the beam-shaped stirring part is 0.45 to 0.80 times the inside diameter of said vessel.
Claim 8
Dependent Claim
93 words
Apparatus for desulfurizing pig iron, as set forth in claim 1, wherein the inlet to said vessel is located on one of the axes of said vessel and said vessel is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant counting from said inlet in the direction of rotation of said stirring member, said outlet is spaced angularly from said inlet and is located in the third quadrant of said vessel, and the opening for supplying desulfurizing agent into said vessel is located in its fourth quadrant.
Claim 9
Dependent Claim
32 words
Apparatus for desulfurizing pig iron, as set forth in claim 1, wherein the upper edge of said vessel is located at least 60 cm above the upper surface of the outlet therefrom.
Claim 10
Dependent Claim
24 words
Apparatus, as set forth in claim 4, wherein said desulfurizing agent is supplied into said vessel through the inlet therein for said pig iron.
References Cited (Backward Citations)
SU154998A1
Cited
US1590730A
Cited
US2290961A
Cited
US2319402A
Cited
US2677609A
Cited
US3572671A
Cited
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 |