US4402275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous blowing of fine-particled reducing agents consisting predominantly of mineral coal into a shaft furnace
Assignee: Arcelor Luxembourg SA
•
Filing: 1981-09-02
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Granted: 1983-09-06
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Expires: 2001-09-02
Abstract
Abstract A mixture of fine-particle mineral coal and a fine-particle solid carrier of carbon is stored in a bulk store from which the mixture is withdrawn and continuously blown into a shaft furnace, e.g. a blast furnace. Sufficient carbon carrier is used to loosen the mixture and to prevent it from caking and sticking. A suitable carbon carrier is particulate compost obtained by rotting household refuse or sewage sludge.
Inventors
- 👤 Antoine Weiner
- 👤 Fernand Artois
- 👤 Raymond Limpach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:50
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/003; C21B5/02; C21B5/023; C21B5/026; C22; C22B; C22B5/00; C22B5/02; C22B5/10; C22B9/00; C22B9/10; C22B9/103; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
In a metallurgical process in which fine-particle mineral coal is continuously blown into a shaft furnace, the improvement which comprises the steps of: mixing the fine-particle mineral coal with at least one fine-particle solid carrier of carbon in the form of alkaline compost made by rotting household waste sewage sludge or a combination thereof; storing the resulting mixture in a bulk store, the quantity of the said carbon carrier being sufficient to loosen the said mixture and to prevent it from caking and sticking in the bulk store: withdrawing the mixture from the store; and blowing the mixture continuously into the shaft furnace.
Claim 2
Dependent Claim
103 words
In a metallurgical process in which fine-particle mineral coal is continuously blown into a shaft furnace, the improvement which comprises the steps of: mixing the fine-particle mineral coal with at least one fine-particle solid carrier of carbon in the form of alkaline compost made by rotting household waste sewage sludge or a combination thereof; storing the resulting mixture in a bulk store, the quantity of the said carbon carrier being sufficient to loosen the said mixture and to prevent it from caking and sticking in the bulk store: withdrawing the mixture from the store; and blowing the mixture continuously into the shaft furnace.
Claim 3
Dependent Claim
33 words
The improvement defined in claim 1, further comprising the step of forming said compost such that the average particle size of the said carbon carrier is substantially equal to that of the coal.
Claim 4
Dependent Claim
34 words
The improvement defined in claim 1 or claim 2, further comprising the step of forming said compost such that the bulk density of the said carbon carrier is lower than that of the coal.
Claim 5
Dependent Claim
21 words
The improvement defined in claim 1, further comprising the step of adding lignite to said compost to form said carbon carrier.
Claim 6
Dependent Claim
21 words
The improvement defined in claim 1, further comprising the step of adding peat to said compost to form said carbon carrier.
Claim 7
Dependent Claim
22 words
The improvement defined in claim 1, further comprising the step of adding peat coke to said compost to form said carbon carrier.
Claim 8
Dependent Claim
21 words
The improvement defined in claim 1, further comprising the step of adding sawdust to said compost to form said carbon carrier.
Claim 9
Dependent Claim
15 words
The process defined in claim 1, in which the compost is obtained by aerobic rotting.
Claim 10
Dependent Claim
16 words
The process defined in claim 1, in which the compost is used as unmatured fresh compost.
References Cited (Backward Citations)
US3864094A
Cited
US4043763A
Cited
US4152119A
Cited
US4324562A
Cited
US4259911A
Cited
GB2069668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |