US4116679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallized iron briquet
Assignee: ZURICH BRANCH OF MIDREX INTERNATIONAL BV A NETHERLANDS Corp
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Filing: 1977-03-24
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Granted: 1978-09-26
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Expires: 1997-03-24
Abstract
Abstract The method of making a briquet from directly reduced finely divided metallized material is disclosed whereby 85 to 95% of metallized material is mixed with 5 to 15% of a binder to form a free flowing briquet feed, then densifying the feed material and forming it into briquets.
Inventors
- 👤 Wolfgang B. Pietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:04
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242; C22B1/244; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C09; C09J; C09J1/00; C09J1/02; C21; C21B; C21B13/00; C21B13/0086; C22B1/243; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A method of making a briquet from directly reduced finely divided metallized material, comprising: mixing from 85 to 95 percent finely divided metallized material with from 5 to 15 percent of binder comprising: about 2 to about 40 percent pitch, about 15 to about 35 percent hydrated lime, about 15 to about 30 percent of a solution of sodium silicate, and up to 50 percent water; to form a free flowing yet dense briquet feed material; densifying said feed material, and forming said feed material into briquets.
Claim 2
Independent Claim
87 words
A method of making a briquet from directly reduced finely divided metallized material, comprising: mixing from 85 to 95 percent finely divided metallized material with from 5 to 15 percent of binder comprising: about 2 to about 40 percent pitch, about 15 to about 35 percent hydrated lime, about 15 to about 30 percent of a solution of sodium silicate, and up to 50 percent water; to form a free flowing yet dense briquet feed material; densifying said feed material, and forming said feed material into briquets.
Claim 3
Dependent Claim
74 words
A method according to claim 1 wherein said finely divided metallized material consists essentially of: from 75 to 100 percent dry metallized fines and from 0 to 25 percent wet clarifier underflow sludge; and said binder composition comprises: about 15 to about 20 percent powdered pitch, about 15 to about 20 percent hydrated lime, about 30 to about 35 percent of a solution of sodium silicate, and about 30 to about 35 percent water.
Claim 4
Independent Claim
49 words
A method of recovering substantially all fines from the operation of a direct reduction furnace comprising: A. separating fine oxide material from coarse feed stock, B. continuously charging a direct reduction furnace with said coarse feed stock, C. simultaneously maintaining a constant flow of fine material to said furnace,
Claim 5
Independent Claim
49 words
A method of recovering substantially all fines from the operation of a direct reduction furnace comprising: A. separating fine oxide material from coarse feed stock, B. continuously charging a direct reduction furnace with said coarse feed stock, C. simultaneously maintaining a constant flow of fine material to said furnace,
Claim 6
Dependent Claim
132 words
D. reducing said coarse feed stock and said fine material in said furnace to at least 85% metallization. E. removing spent reducing gas as dust-laden top gas from said furnace and collecting the dust therefrom as fines, F. collecting fine material from the product, G. feeding the collected fines to an agglomerating plant, H. mixing about 85 to 95 percent of said fines with about 5 to about 15 percent of a binder comprising: about 2 to about 40 percent pitch, about 15 to about 35 percent hydrated lime, about 15 to about 30 percent of a solution of sodium silicate, and up to about 50 percent water; I. densifying the feed material -- binder mixture; and J. forming the mixture into agglomerates suitable for feed material to iron and steelmaking furnaces.
Claim 7
Dependent Claim
132 words
D. reducing said coarse feed stock and said fine material in said furnace to at least 85% metallization. E. removing spent reducing gas as dust-laden top gas from said furnace and collecting the dust therefrom as fines, F. collecting fine material from the product, G. feeding the collected fines to an agglomerating plant, H. mixing about 85 to 95 percent of said fines with about 5 to about 15 percent of a binder comprising: about 2 to about 40 percent pitch, about 15 to about 35 percent hydrated lime, about 15 to about 30 percent of a solution of sodium silicate, and up to about 50 percent water; I. densifying the feed material -- binder mixture; and J. forming the mixture into agglomerates suitable for feed material to iron and steelmaking furnaces.
Claim 8
Dependent Claim
18 words
A method according to claim 3 wherein the dust is collected from said top gas as wet fines.
Claim 9
Dependent Claim
38 words
A method according to claim 3 wherein said furnace includes a cooling zone through which cooling gas is passed, said method further comprising removing dust-laden cooling gas from said cooling zone and collecting the dust therefrom as fines.
Claim 10
Dependent Claim
27 words
A method according to claim 3, wherein iron oxide material is collected from any location at which such fines are present, then fed to an agglomerating plant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |