US4283223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating smoke from steel plants
Assignee: PROCEDAIR SA
•
Filing: 1979-09-24
•
Granted: 1981-08-11
•
Expires: 1999-09-24
Abstract
Abstract A process for treating smoke from steel plants coming from blast furnaces, electric furnaces, converters and cupola furnaces. The process of the invention consists first of all in separating, when hot, the iron and iron oxide dust from the smoke by contact with solid particles, then in cooling this smoke to solidify the non-ferrous metal vapors which they contain, then finally in separating the solidified non-ferrous metals. It is possible to recover for a smaller cost, on the one hand, the iron and iron oxide dust and, on the other hand, the non-ferrous metals in solid form. Heat may also be recovered.
Inventors
- 👤 Francois Billard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:20
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21C; C21C5/00; C21C5/28; C21C5/38; C22; C22B; C22B7/00; C22B7/02; F; F27; F27B; F27B1/00; F27B1/10; F27B1/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02W; Y02W30/00; Y02W30/50; Y10; Y10S; Y10S75/00; Y10S75/961
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A method for treating smoke from steel plants, said smoke comprising a carrier gas, iron and iron oxides dust and non-ferrous metals in vapor form, said smoke being at a temperature higher than the vaporization temperature of said non-ferrous metals, said method comprising the following steps, in sequence: effecting, while the smoke is in the hot state, without noticeable cooling thereof, a first, dry separation between, on the one hand, said iron and iron oxides dust and, on the other hand, said carrier gas mixed with said non-ferrous metals in vapor form; cooling said carrier gas and non-ferrous metals to a temperature lower than the solidification temperature of the non-ferrous metals so as to produce cooling of said carrier gas and solidification of said non-ferrous metals; and effecting a second separation, between the cooled carrier gas and the solidified non-ferrous metals.
Claim 2
Independent Claim
141 words
A method for treating smoke from steel plants, said smoke comprising a carrier gas, iron and iron oxides dust and non-ferrous metals in vapor form, said smoke being at a temperature higher than the vaporization temperature of said non-ferrous metals, said method comprising the following steps, in sequence: effecting, while the smoke is in the hot state, without noticeable cooling thereof, a first, dry separation between, on the one hand, said iron and iron oxides dust and, on the other hand, said carrier gas mixed with said non-ferrous metals in vapor form; cooling said carrier gas and non-ferrous metals to a temperature lower than the solidification temperature of the non-ferrous metals so as to produce cooling of said carrier gas and solidification of said non-ferrous metals; and effecting a second separation, between the cooled carrier gas and the solidified non-ferrous metals.
Claim 3
Dependent Claim
21 words
A method according to claim 1, characterized in that said first separation is carried out by direct contact with solid particles.
Claim 4
Dependent Claim
25 words
A method according to claim 1, characterized in that the cooling of the carrier gas is carried out by indirect contact with a cooling fluid.
Claim 5
Dependent Claim
18 words
A method according to claim 3, characterized in that the heat produced by the cooling step is recovered.
Claim 6
Dependent Claim
19 words
A method according to claim 1, characterized in that said second separation is carried out in a sleeve filter.
Claim 7
Dependent Claim
20 words
A method according to claim 1, characterized in that said second separation is carried out in an electrostatic dust remover.
References Cited (Backward Citations)
US1301373A
Cited
US2002860A
Cited
SU143410A1
Cited
US3395512A
Cited
SU370241A1
Cited
US3731910A
Cited
US3756804A
Cited
US3945817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |