US4030709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of plugging tapholes in phosphorus furnaces
Assignee: FMC Corp
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Filing: 1976-03-04
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Granted: 1977-06-21
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Expires: 1996-03-04
Abstract
Abstract A method of plugging phosphorus tapholes with a plug of matted ceramic fibers such as alumina-silica fibers wherein closure is effected by placing the ceramic plug, in the shape of a hollow cone, over a backing plug which is then inserted into the furnace taphole by means of a long handle attached to the base of the backing plug. The backing plug is maintained in place until molten furnace material solidifies against the plug thereby sealing off the taphole. Before the furnace is ready to be tapped, the backing plug is removed and the ceramic plug burned out with an oxygen lance.
Inventors
- 👤 E. Dwayne Shepard
- 👤 Gordon H. Scherbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:24
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/15; F27D3/1509; F27D3/1536; C; C21; C21B; C21B7/00; C21B7/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A method of plugging tapholes in a phosphorus furnace comprising the steps: a. providing a hollow plug member having walls of matted refractory ceramic fibers and conforming generally, at its point of contact, to the opening of the taphole, said member containing at least one hollow end and adapted to receive a supportive backing plug through said hollow end; b. placing the hollow plug member over a rigid, heat resistant supportive backing plug adapted to make contact with the inner surface of the hollow plug member; c. inserting the hollow plug member while mounted on the supportive backing plug into the taphole and applying sufficient force to effect a seal between the outer walls of said hollow plug member and taphole opening; d. retaining the backing plug in place until sufficient molten furnace material solidifies against the the hollow plug member thereby plugging the taphole, and e. removing the backing plug.
Claim 2
Independent Claim
151 words
A method of plugging tapholes in a phosphorus furnace comprising the steps: a. providing a hollow plug member having walls of matted refractory ceramic fibers and conforming generally, at its point of contact, to the opening of the taphole, said member containing at least one hollow end and adapted to receive a supportive backing plug through said hollow end; b. placing the hollow plug member over a rigid, heat resistant supportive backing plug adapted to make contact with the inner surface of the hollow plug member; c. inserting the hollow plug member while mounted on the supportive backing plug into the taphole and applying sufficient force to effect a seal between the outer walls of said hollow plug member and taphole opening; d. retaining the backing plug in place until sufficient molten furnace material solidifies against the the hollow plug member thereby plugging the taphole, and e. removing the backing plug.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the plug member is in the shape of a cone.
Claim 4
Dependent Claim
12 words
The method according to claim 2 wherein the backing plug is steel.
Claim 5
Dependent Claim
14 words
The method according to claim 2 wherein the refractory ceramic fibers are kaolin fibers.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |