CA2041863A1 - Flotation-deinking-device - Google Patents
Flotation-deinking-deviceInfo
- Publication number
- CA2041863A1 CA2041863A1 CA 2041863 CA2041863A CA2041863A1 CA 2041863 A1 CA2041863 A1 CA 2041863A1 CA 2041863 CA2041863 CA 2041863 CA 2041863 A CA2041863 A CA 2041863A CA 2041863 A1 CA2041863 A1 CA 2041863A1
- Authority
- CA
- Canada
- Prior art keywords
- flotation
- deinking
- staged
- suspension
- diffusor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1418—Flotation machines using centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/24—Pneumatic
- B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1443—Feed or discharge mechanisms for flotation tanks
- B03D1/1456—Feed mechanisms for the slurry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
ABSTRACT
The invention relates to a flotation-deinking-device comprising a flotation vessel and at least one inlet for introducing the suspension into the flotation vessel, the inlet being a staged diffusor (12) in which in a region of the stage transition (26) an air inlet opening (20) is arranged. A turbulence generator (28) without an air supply is arranged upstream of the stage transition (26) as seen in the direction of flow.
The invention relates to a flotation-deinking-device comprising a flotation vessel and at least one inlet for introducing the suspension into the flotation vessel, the inlet being a staged diffusor (12) in which in a region of the stage transition (26) an air inlet opening (20) is arranged. A turbulence generator (28) without an air supply is arranged upstream of the stage transition (26) as seen in the direction of flow.
Description
~ ~3 ~ 3~
Flotation-Deinkinq-Pevice The invention xelates to a flotation-deinking-device comprising a flotation vessel and at least one inlet for introducing the suspension into the flotation vessel, the flotation vessel being arranged as a staged diffusor in which in the area of the stage transition an air inlet opening is arranged, an accept outlet and an outlet for the froth carrying the attached colour particles. Here, a stage transition means a right-angled stage transition.
Such a flotation-deinking-device is known from DE-OS
35 29 63B. In this, a two-staged diffusor for introducing the suspension is described in wh1ch air is drawn in either at the stage transition located upstream in the direction of flow or at both stage transitions in order to mix the air into the suspension so that small air bubbles are formed as a result of a turbulent flow to which colour particles in the suspension are able to attach themselves.
Flotation cells are already known in which the suspension-air mixture is tangentially introduced in a horizontal direction into a circular-cylindrical flotation vessel. The air bubbles formed in the diffusor to which the coloured particles have attached themselves swim as a froth in this flotation container up to the surface of the suspension in the flotation vessel. Here, the froth then flows over into a central outlet. At the base of the flotation vessel, the suspension separated from the colour particles is withdrawn as accept.
Flotation-Deinkinq-Pevice The invention xelates to a flotation-deinking-device comprising a flotation vessel and at least one inlet for introducing the suspension into the flotation vessel, the flotation vessel being arranged as a staged diffusor in which in the area of the stage transition an air inlet opening is arranged, an accept outlet and an outlet for the froth carrying the attached colour particles. Here, a stage transition means a right-angled stage transition.
Such a flotation-deinking-device is known from DE-OS
35 29 63B. In this, a two-staged diffusor for introducing the suspension is described in wh1ch air is drawn in either at the stage transition located upstream in the direction of flow or at both stage transitions in order to mix the air into the suspension so that small air bubbles are formed as a result of a turbulent flow to which colour particles in the suspension are able to attach themselves.
Flotation cells are already known in which the suspension-air mixture is tangentially introduced in a horizontal direction into a circular-cylindrical flotation vessel. The air bubbles formed in the diffusor to which the coloured particles have attached themselves swim as a froth in this flotation container up to the surface of the suspension in the flotation vessel. Here, the froth then flows over into a central outlet. At the base of the flotation vessel, the suspension separated from the colour particles is withdrawn as accept.
- 2 - ~3~ 3~
It is an object of the invention to provide a flotation-deinking-device with which colour particles of a particle size in the range of ca. 60 um to several 100 u in diameter can be separated from the suspension while maintaining a good efficiency.
This object is solved in accordance with the invention in that a tur~ulence generator without air feed is arranged upstream of the stage transition as seen in the direction of ~low.
On account of the upstream arrangement of the turbulence generator, the possibility arises to arrange the flotation-deinking-device in such a manner that a sufficiently large number of larger air bubbles can be generated downstream of the stage transition to which the mentioned larger colour particles can better attach themselves with good efficiency and in act substantially independently of the particle size in the mentioned range.
As a particularly simple variant of the turbulence generator, a further stage transiti.on within the staged diffusor can be utilized. The diameter enlargement of this stage trarlsition preferably amounts to at least 3 mm.
.
A further improvement of the solution of the object according to claim 1 results from the cross sections above and below the stage progression being dimensioned such that a reduction in the suspension flow velocity of at least 3 m~s. can ensue.
Apart from a stage transition, the turbulence generator can also be formed by a narrowing of the flow cross section, which leads to turbulence, as well as by a static mixer, the components of which lead to turbulence.
- 3 - ~ ?~
In accordance with an advantageous development the staged diffusor can be arranged vertically and open horizontally into the flotation vessel via a deflector. This deflector leads to an additional mixing of the suspension with the air before the introduction of the mixture into the flotation vessel, thus enhancing the attachment of the colour particles.
On account of the stage diffusor opening tangentially into the flotation vessel, a rotational movement of the suspension in the 10tation vessel is caused in the flotation vessel resulting in a better central withdrawal of the colour particle carrying froth which swims towards the surface of the suspension.
In order that the air bubbles laiden with dirt particles can escape along the shortest path within the flotation vessel towards the top of and out of the suspension, the staged diffusor preferably opens directly beneath the suspension surface formed in the flotation vessel. The range of O to 500 ~m, preferably 50 to Z50`~n has proven to be an advantageous dimension of the distance between the upper edge of the staged diffusor and the suspension surface.
This is particularly important for the separation of large colour particles. Large particles in fact present the surrounding suspension with a large attachement surface.
They therefore tend more strongly to rernain hanging in the elastic network of the fibers in the fiber suspension and to be torn off. Additionally, the forces of the surrounding suspension flow can also lead to tearing away.
Usefully, several staged diffusors can be arranged adjacent one another.
_ 4 - ~3~3~3 The invention is described in more detail in the following on the basis of purely schematic exemplified embodiments shown in the drawings, in which:
Fig. 1 shows a schematic longitudinal cross sectional view of a flotation-deinking-device, Fig. 2 shows a plan view of the device according to Fig. 1, Fig. 3 shows a schematic depiction of a staged diffusor, and 0 Fig. 4 shows a schematic depiction of a somewhat altered staged diffusor.
The flotation-deinking-device depicted in Fig. 1 comprises a flotation vessel 10 having an inlet for the grey stock or the fiher suspension which is stil:L mixed with colour particles. This opening is ~`ormed as a staged diffusor 12 even if this cannot be recognized from Fig. 1. This staged diffusor 12 is arranged vertically and enters horizontally via a deflector 14 in the shown manner into the flotation vessel 10, although this is naturally also conceivable at an angle other than an angle of 90~ to the vertical. As can be seen from Fig. 2, several inlets, in this case three, are arranged adjacent to one another in such a manner that these enter tangentially into the circular-cylindrical flotation vessel 10.
As can be see from Fig. 1, the inlet opens into the flotation vessel 10 closely beneath the suspension surface formed in the flotation vessel 10.
A froth withdrawl pipe 16 is located centrally in the middle of the flotation vessel and an accept withdrawal pipe 18 is arranged in the bottom of the flotation vessel lO radially outside the froth withdrawal pipe 16.
An air inlet 20 is located laterally to the side of the inlet.
The construction of the staged diffusor 12 can be seen schematically in Figs. 3 and 4. The direction of flow through-the staged diffusor is shown by means of the arrows 22 and 24. The air inlet 20 is located in the region of the stage transition 26, i.e. the location at which the flow cross section is widened. A turbulence generator 28 only indicated schematically in Fig. 3 is arranged upstream of the stage transition 26 in the direction of flow. In Fig. 9, this turbulence generator is formed by an upstream stage transition 30.
In the following, the mode of operation of the device is described.
The grey stock or the fiber suspension which is still mixed with the colour particles is introduced into the staged diffusor 12 in accordance with the arrow 23. In the region of the turbulence generator, a turbulence is formed in the suspension flow. ~y means of this turbulence formation, the suspension flow enters into the region of the stage transition 26 where, on account of a suction effect, air is introduced into the suspension flow in order to generate a sufficient numbsr of and sufficiently large air bubbles to which colour particles of the size of up to several lO0 um in diameter in the suspension can attach themselves during the mixing of the air with the suspension.
- 6 ~ i ? t The suspension-air mixture is then tangentially introduced into the flotation vessel 10 with the result that the air bubbles with the attached colour particles swim up to the surface along the shortest path and then overflow into the froth withdrawal pipe 16. This overflowing process in the center of the flotation vessel is enhanced by the rotational flow within the flotation vessel. The accept substantially cleaned of colour particles is withdrawn at the bottom of the flotation vessel via the withdrawal pipe 18.
It is an object of the invention to provide a flotation-deinking-device with which colour particles of a particle size in the range of ca. 60 um to several 100 u in diameter can be separated from the suspension while maintaining a good efficiency.
This object is solved in accordance with the invention in that a tur~ulence generator without air feed is arranged upstream of the stage transition as seen in the direction of ~low.
On account of the upstream arrangement of the turbulence generator, the possibility arises to arrange the flotation-deinking-device in such a manner that a sufficiently large number of larger air bubbles can be generated downstream of the stage transition to which the mentioned larger colour particles can better attach themselves with good efficiency and in act substantially independently of the particle size in the mentioned range.
As a particularly simple variant of the turbulence generator, a further stage transiti.on within the staged diffusor can be utilized. The diameter enlargement of this stage trarlsition preferably amounts to at least 3 mm.
.
A further improvement of the solution of the object according to claim 1 results from the cross sections above and below the stage progression being dimensioned such that a reduction in the suspension flow velocity of at least 3 m~s. can ensue.
Apart from a stage transition, the turbulence generator can also be formed by a narrowing of the flow cross section, which leads to turbulence, as well as by a static mixer, the components of which lead to turbulence.
- 3 - ~ ?~
In accordance with an advantageous development the staged diffusor can be arranged vertically and open horizontally into the flotation vessel via a deflector. This deflector leads to an additional mixing of the suspension with the air before the introduction of the mixture into the flotation vessel, thus enhancing the attachment of the colour particles.
On account of the stage diffusor opening tangentially into the flotation vessel, a rotational movement of the suspension in the 10tation vessel is caused in the flotation vessel resulting in a better central withdrawal of the colour particle carrying froth which swims towards the surface of the suspension.
In order that the air bubbles laiden with dirt particles can escape along the shortest path within the flotation vessel towards the top of and out of the suspension, the staged diffusor preferably opens directly beneath the suspension surface formed in the flotation vessel. The range of O to 500 ~m, preferably 50 to Z50`~n has proven to be an advantageous dimension of the distance between the upper edge of the staged diffusor and the suspension surface.
This is particularly important for the separation of large colour particles. Large particles in fact present the surrounding suspension with a large attachement surface.
They therefore tend more strongly to rernain hanging in the elastic network of the fibers in the fiber suspension and to be torn off. Additionally, the forces of the surrounding suspension flow can also lead to tearing away.
Usefully, several staged diffusors can be arranged adjacent one another.
_ 4 - ~3~3~3 The invention is described in more detail in the following on the basis of purely schematic exemplified embodiments shown in the drawings, in which:
Fig. 1 shows a schematic longitudinal cross sectional view of a flotation-deinking-device, Fig. 2 shows a plan view of the device according to Fig. 1, Fig. 3 shows a schematic depiction of a staged diffusor, and 0 Fig. 4 shows a schematic depiction of a somewhat altered staged diffusor.
The flotation-deinking-device depicted in Fig. 1 comprises a flotation vessel 10 having an inlet for the grey stock or the fiher suspension which is stil:L mixed with colour particles. This opening is ~`ormed as a staged diffusor 12 even if this cannot be recognized from Fig. 1. This staged diffusor 12 is arranged vertically and enters horizontally via a deflector 14 in the shown manner into the flotation vessel 10, although this is naturally also conceivable at an angle other than an angle of 90~ to the vertical. As can be seen from Fig. 2, several inlets, in this case three, are arranged adjacent to one another in such a manner that these enter tangentially into the circular-cylindrical flotation vessel 10.
As can be see from Fig. 1, the inlet opens into the flotation vessel 10 closely beneath the suspension surface formed in the flotation vessel 10.
A froth withdrawl pipe 16 is located centrally in the middle of the flotation vessel and an accept withdrawal pipe 18 is arranged in the bottom of the flotation vessel lO radially outside the froth withdrawal pipe 16.
An air inlet 20 is located laterally to the side of the inlet.
The construction of the staged diffusor 12 can be seen schematically in Figs. 3 and 4. The direction of flow through-the staged diffusor is shown by means of the arrows 22 and 24. The air inlet 20 is located in the region of the stage transition 26, i.e. the location at which the flow cross section is widened. A turbulence generator 28 only indicated schematically in Fig. 3 is arranged upstream of the stage transition 26 in the direction of flow. In Fig. 9, this turbulence generator is formed by an upstream stage transition 30.
In the following, the mode of operation of the device is described.
The grey stock or the fiber suspension which is still mixed with the colour particles is introduced into the staged diffusor 12 in accordance with the arrow 23. In the region of the turbulence generator, a turbulence is formed in the suspension flow. ~y means of this turbulence formation, the suspension flow enters into the region of the stage transition 26 where, on account of a suction effect, air is introduced into the suspension flow in order to generate a sufficient numbsr of and sufficiently large air bubbles to which colour particles of the size of up to several lO0 um in diameter in the suspension can attach themselves during the mixing of the air with the suspension.
- 6 ~ i ? t The suspension-air mixture is then tangentially introduced into the flotation vessel 10 with the result that the air bubbles with the attached colour particles swim up to the surface along the shortest path and then overflow into the froth withdrawal pipe 16. This overflowing process in the center of the flotation vessel is enhanced by the rotational flow within the flotation vessel. The accept substantially cleaned of colour particles is withdrawn at the bottom of the flotation vessel via the withdrawal pipe 18.
Claims (10)
1. Flotation-deinking-device comprising a flotation vessel (10) and at least one inlet for introducing the suspension into the flotation vessel (10), which inlet is formed as a staged diffusor (12) in which in the region of the stage transition (26) an air inlet opening (28) is arranged, an accept outlet (18) and an outlet (16) for the froth carrying the attached colour particles, characterized in that a turbulence generator (28; 30) without an air feed is arranged upstream of the stage transition (26) as seen in the direction of flow.
2. Flotation-deinking-device according to claim 1, characterized in that the turbulence generator is a stage transition (30).
3. Flotation-deinking-device according to claim 2, characterized in that the diameter enlargement of the stage transition (30) is at least 3 mm.
4. Flotation-deinking-device according to claim 2 or 3, characterized in that the cross sections ahead of and behind the stage transition (30) are dimensioned such that a reduction of the suspension flow speed of at least 3 m/s. can ensue.
5. Flotation-deinking-device according to claim 1, characterized in that the turbulence generator is formed as a narrowing of the flow cross section which leads to turbulence.
6. Flotation-deinking-device according to claim 1, characterized in that the turbulence generator is formed as a static mixer, the components of which lead to turbulence.
7. Flotation-deinking-device according to one of the claims 1 to 6, characterized in that the staged diffusor (12) is arranged vertically and opens horizontally into the flotation vessel (10) by means of a deflector (14).
8. Flotation-deinking-device according to claim 7, characterized in that the staged diffusor (12) opens tangentially into the flotation vessel (10).
9. Flotation-deinking-device according to one of the claims 1 to 8, characterized in that the staged diffusor (12) or the deflector (14) opens into the flotation vessel (10) directly beneath the suspension surface formed in the flotation vessel (10).
10. Flotation-deinking-device according to one of the claims 1 to 5, characterized in that several staged diffusors (12) are arranged adjacent one another.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4017446.8 | 1990-05-30 | ||
| DE19904017446 DE4017446C2 (en) | 1990-05-30 | 1990-05-30 | Flotation deinking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2041863A1 true CA2041863A1 (en) | 1991-12-01 |
Family
ID=6407503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2041863 Abandoned CA2041863A1 (en) | 1990-05-30 | 1991-05-06 | Flotation-deinking-device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0459089B1 (en) |
| AT (1) | ATE106476T1 (en) |
| CA (1) | CA2041863A1 (en) |
| DE (1) | DE4017446C2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4330635C2 (en) * | 1993-09-10 | 1996-07-11 | Voith Sulzer Stoffaufbereitung | Process for the separation of solids by flotation and flotation device |
| DE19835434C2 (en) * | 1998-08-05 | 2000-08-17 | Wolfgang Reuschl | Apparatus and method for the sterile separation of solid particles from suspensions by means of pneumatic flotation in continuous operation |
| RU2501609C2 (en) * | 2012-08-28 | 2013-12-20 | Виталий Евгеньевич Дьяков | Centrifuge for flotation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2938629A (en) * | 1955-07-28 | 1960-05-31 | Smith Douglass Company Inc | Concentration of comminuted materials |
| SE422091B (en) * | 1978-03-23 | 1982-02-15 | Karlstad Mekaniska Ab | INPUT CABLE FOR A PAPER MACHINE |
| CH658481A5 (en) * | 1983-02-18 | 1986-11-14 | Escher Wyss Gmbh | FLOTATION DEVICE FOR FLOTING FIBER FIBER SUSPENSION MADE FROM WASTE PAPER. |
| GB8310494D0 (en) * | 1983-04-19 | 1983-05-25 | Beloit Walmsley Ltd | Deinking |
| CH665962A5 (en) * | 1985-07-19 | 1988-06-30 | Escher Wyss Gmbh | GASIFICATION DEVICE FOR A FLOTATION DEVICE AND ITS USE. |
-
1990
- 1990-05-30 DE DE19904017446 patent/DE4017446C2/en not_active Expired - Fee Related
-
1991
- 1991-03-01 AT AT91103092T patent/ATE106476T1/en not_active IP Right Cessation
- 1991-03-01 EP EP19910103092 patent/EP0459089B1/en not_active Expired - Lifetime
- 1991-05-06 CA CA 2041863 patent/CA2041863A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4017446C2 (en) | 1995-02-23 |
| EP0459089A1 (en) | 1991-12-04 |
| ATE106476T1 (en) | 1994-06-15 |
| DE4017446A1 (en) | 1992-01-23 |
| EP0459089B1 (en) | 1994-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |