US4171965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making granulated slag
Assignee: Arcelor Luxembourg SA
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Filing: 1978-04-18
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Granted: 1979-10-23
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Expires: 1998-04-18
Abstract
Abstract Slag sand is produced by first mixing a stream of molten slag with a quantity of between 0.5 m 3 and 0.7 m 3 of water per ton of slag to chill the slag while leaving it above the pyroplasticity threshold. Thereafter water at a rate of between 0.3 m 3 and 0.4 m 3 is added to the slag to stiffen the stream and this stiffened stream is fed to a drum rotating at a rate between 600 rpm and 1000 rpm to break it up into fine granules which are collected on a foraminous belt.
Inventors
- 👤 Robert Schockmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:04
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; C21B2400/05; C21B2400/052; C21B2400/056
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A method of granulating slag comprising the steps of: passing molten slag along an inclined trough; cooling said molten slag in said trough by mixing said molten slag with a predetermined limited quantity of water insufficient to cool said slag below the threshold of pyroplasticity; thereafter stiffening the cooled molten slag by mixing same with between 0.5 m 3 and 0.7 m 3 of water per ton of slag to form a stiffened slag mass; impinging said stiffened slag mass on a rotating drum and thereby breaking said mass up into fine particles and projecting said particles through the air to a collection location; and collecting said particles at said location.
Claim 2
Independent Claim
111 words
A method of granulating slag comprising the steps of: passing molten slag along an inclined trough; cooling said molten slag in said trough by mixing said molten slag with a predetermined limited quantity of water insufficient to cool said slag below the threshold of pyroplasticity; thereafter stiffening the cooled molten slag by mixing same with between 0.5 m 3 and 0.7 m 3 of water per ton of slag to form a stiffened slag mass; impinging said stiffened slag mass on a rotating drum and thereby breaking said mass up into fine particles and projecting said particles through the air to a collection location; and collecting said particles at said location.
Claim 3
Dependent Claim
40 words
The method defined in claim 1 wherein said slag is mixed with water in the cooling step in the upstream third of said trough, said slag having a residence time of between 5 sec and 8 sec in said trough.
Claim 4
Dependent Claim
35 words
The method defined in claim 2 wherein said slag is mixed with water in the stiffening step at a rate of between 0.3 m 3 and 0.4 m 3 of water per ton of slag.
Claim 5
Dependent Claim
20 words
The method defined in claim 2 wherein said drum is rotated at a speed between 600 rpm and 1000 rpm.
Claim 6
Dependent Claim
20 words
The method defined in claim 2 wherein said water is process water at a temperature of at least 40° C.
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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |