US4347128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation apparatus for de-inking pulp suspensions
Assignee: E+ M LAMORT SA
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Filing: 1981-04-08
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Granted: 1982-08-31
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Expires: 2001-04-08
Abstract
Abstract Flotation apparatus for de-inking of pulp suspension in a flotation cell with injectors for feeding the pulp suspension into the cell and for aerating the pulp suspension. The injectors are equipped with wide slot nozzles through which the suspension flows having a ratio of cross-sectional area to periphery of between 1.5 mm and 4.0 mm. A mixing chamber receiving pulp suspension flow from the wide slot nozzles is provided having a cross-sectional area which is between 1.3 to 1.7 times the cross-sectional area of the wide slot nozzles.
Inventors
- 👤 Wolfgang Barnscheidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:38
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21B1/325; D21B1/327; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2323; B01F23/23231; B01F25/00; B01F25/20; B01F25/21; B01F25/30; B01F25/31; B01F25/312; B01F25/3124; B01F25/31242; B01F35/00; B01F35/10; B01F35/145; B01F35/1452; B03; B03D; B03D1/00; B03D1/14; B03D1/1443; B03D1/1456; B03D1/1462; B03D1/24; B03D1/247; D21F; D21F1/00; D21F1/66; D21F1/70; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64; Y10; Y10S; Y10S261/00; Y10S261/75
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
In flotation apparatus for de-inking of pulp suspension including a flotation cell and injectors for feeding said pulp suspension therethrough into said cell and for aerating said pulp suspension, the improvement comprising that said injectors are formed to define a wide slot nozzle having a generally rectangular configuration with a width dimension and a height dimension, said nozzle being dimensioned with a ratio of cross-sectional area to periphery of between 1.5 and 4 and that a generally rectangular mixing chamber receiving pulp suspension from said wide slot nozzle is provided adjacent said nozzle, said mixing chamber having a cross-sectional area which is between 1.3 to 1.7 times the cross-sectional area of said wide slot nozzle.
Claim 2
Dependent Claim
115 words
In flotation apparatus for de-inking of pulp suspension including a flotation cell and injectors for feeding said pulp suspension therethrough into said cell and for aerating said pulp suspension, the improvement comprising that said injectors are formed to define a wide slot nozzle having a generally rectangular configuration with a width dimension and a height dimension, said nozzle being dimensioned with a ratio of cross-sectional area to periphery of between 1.5 and 4 and that a generally rectangular mixing chamber receiving pulp suspension from said wide slot nozzle is provided adjacent said nozzle, said mixing chamber having a cross-sectional area which is between 1.3 to 1.7 times the cross-sectional area of said wide slot nozzle.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1 wherein said injector is provided with aeration bores in flow communication with said mixing chamber having a total cross-sectional area which is between 1.1 to 1.4 times the air suction cross-sectional area of said mixing chamber.
Claim 4
Dependent Claim
34 words
Apparatus according to claim 1 or 2 wherein aeration bores are arranged in said injector at an angle of approximately 30° to 60° with respect to the direction of flow of pulp suspension therethrough.
Claim 5
Dependent Claim
37 words
Apparatus according to claim 3 wherein said wide slot nozzle, the discharge of said aeration bores and at least a partial region of said mixing chamber are located within an insert which is mounted in said injector.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 4 wherein said insert comprises a rotatably supported member having one of a cylindrical or conical configuration.
Claim 7
Dependent Claim
31 words
Apparatus according to claim 3 wherein said injector is formed with a casing which is provided with cleaning openings or enabling cleaning of said wide slot nozzle and said aeration bores.
Claim 8
Dependent Claim
30 words
Apparatus according to claim 4 wherein said injector is formed with a casing which is provided with stops for determining an operative position and a cleaning position of said insert.
Claim 9
Dependent Claim
27 words
Apparatus according to claim 4 wherein said injector is formed with a casing which is provided with a locking mechanism for affixing said insert in operative position.
References Cited (Backward Citations)
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |