CN201891043U - Flotation device for removing impurities from fiber suspension through flotation process - Google Patents
Flotation device for removing impurities from fiber suspension through flotation process Download PDFInfo
- Publication number
- CN201891043U CN201891043U CN201020520068XU CN201020520068U CN201891043U CN 201891043 U CN201891043 U CN 201891043U CN 201020520068X U CN201020520068X U CN 201020520068XU CN 201020520068 U CN201020520068 U CN 201020520068U CN 201891043 U CN201891043 U CN 201891043U
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- CN
- China
- Prior art keywords
- passage
- jet
- suspension
- passage section
- flotation
- 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.)
- Expired - Fee Related
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- 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
-
- 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
The utility model relates to a flotation device for removing impurities from fiber suspension through a flotation process, comprising at least one flotation slot (10), at least one mixing device (1) which has at least one efflux forming channel (3) through which the suspension (S) flows by for inputting gas (6), at least one pipe for discharging the formed flotation foam (2) and at least one pipe for outputting purified qualified product (A), wherein through the designed efflux forming channel (3), the suspension (S) flowed by the channel can be accelerated and form vortex.
Description
Technical field
The utility model relates to a kind of flotation unit that is used for removing from fibrous suspension by floatation impurity.
Background technology
Form a kind of floating foam or foam of waiting to remove material that comprise by floatation.The typical use occasion of this method is, the suspension that obtains from the waste paper that has printed is carried out preliminary treatment, and in described suspension, ink particle comes off from fiber, thereby can flotate.Floatation process described herein has utilized qualitative difference between paper fiber and the unwanted impurity particle, promptly, fiber is owing to its easier hydrophilic characteristic is deposited in the fibrous suspension, and above-mentioned impurity particle is hydrophobic, thereby arrives in the floating foam with bubble.Because at this is not that all solids are all flotated, but fiber is separated from dirt, people are referred to as optionally flotation.The notion of " floatation and ink removing " that is used equally not only is applied to removing ink particle (ink=printing ink) under normal conditions, but also is applied to from fibrous suspension optionally flotation dirt more at large.These materials refer to adhesive, thin plastic grain and the resin that also might exist especially.
The prior art relevant with the method for floating of fibrous suspension obtained to develop very widely.Therefore there is the suitable fully scheme of removing most of solid particle by floatation.This is particularly useful for treating that the fibre density (fiber content in the gross mass of fibrous suspension) of the fibrous suspension of flotation is about those methods that adopted at 1% o'clock.Higher fibre density (for example 1.2% to 2.5%) all can cause loss, for example lower final whiteness and/or the higher stain content renderd a service so far usually.Gas is injected the suspension (common described gas adopts air) treat flotation, be in a kind of mixing arrangement of special design for this reason, realizes according to the flotation gas of ejector principle by sneaking into.At this moment, gas is sucked by the suspension that flows and mixes with described suspension.At this, form at least one bar suspension liquid free jet for this reason.In addition, gas must be evenly distributed in the suspension as far as possible with the bubble form of setting, and produces with solid particle to be floatingly selected and to contact.
Known mixing arrangement has the cross section of at least one burst and widens (stairstepping transition), so that suspension forms eddy current and strengthens the infiltration of gas thus.In addition, suspension flow is divided into a plurality of parallel sub-thread jets, for this reason, often uses a kind of orifice plate with cylindrical hole.
DE3120202A1 has put down in writing a kind of instrument used for injection, in described instrument used for injection, can realize sucking air and forming the required bubble of flotation from flotation cell is inner.
Summary of the invention
Therefore technical problem to be solved in the utility model is further to improve the effectiveness of said method.Especially should realize, under disadvantageous condition of work, for example when fibre density than normal conditions (about 1%) when high (when being about 1.2% to 2.5%), can realize that also good gas mixes and produces the bubble with favourable size.
Above-mentioned technical problem was solved by the device that floatation is removed impurity from fibrous suspension by a kind of being used for, this device comprises at least one flotation cell and at least one can be flow through and have the mixing arrangement of at least one jet formation passage to be used to import gas by suspension, and comprise at least one pipeline that is used to discharge the floating foam of formed flotation in addition and at least one is used to export the pipeline of the certified products that purified, according to the utility model, described jet is formed channels designs become, make the fibrous suspension that flows through it be accelerated and form eddy current.
Preferably, described jet forms passage has the streamwise convergent at input passage section, after the passage section of described convergent the downstream be invariable, have length between 1 and 30mm between, preferably between 3 and 20mm between the passage section of pref. cylindrical.
Preferably, described jet form passage output have streamwise with between between 2 ° and 30 °, the preferred passage section of the tapered expansion of coning angle between 3 ° and 8 °.
Roughening preferably is at least 0.3mm by roughness depth and is up to the groove of 5mm, groove, slotted eye, blind hole or projection and produces.
Roughening by trend or layout vertically and circumferencial direction groove, groove, slotted eye or the projection of extending and be preferably formed thus screw line produce.
According to the utility model, the suspension jet that flows can be fashioned into, make the gas that adds to form when being discharged from the passage from jet and infiltrate in the surface easily at jet.This is the unstability by jet, and just expansion or bump are realized rapidly.So, the frictional force between suspension and the gas increases significantly, and therefore jet absorbs more gas.In order to reach the expansion rapidly or the bump of jet, must form additional eddy current or strengthen existing eddy current.Following possibility method is provided for this reason:
1. improve the flowing velocity of suspension jet, and/or
2. form the special spigot surface of wallboard design of the contact suspension in the passage for jet, and/or
3. be the special spigot surface of wallboard design of the contact suspension that jet forms the passage downstream area in the mixing arrangement.
Method 1:
Usually, with the suspension that paper or paper pulp fiber form, the average flow velocity with about 2m/s in pipeline is transported through passage section.When using according to method of the present invention, can be directly before injecting gas, form at jet and to adopt very big acceleration in the passage, preferably accelerate to and be higher than 10m/s to 15m/s, this will help rapidly expansion or the bump of jet after forming when being discharged from the passage from jet and discharging.The measure of other reinforcement eddy current can be implemented with the measure combination of this raising flowing velocity especially effectively.
Method 2:
For example the coarse spigot surface that produces by means of groove, groove, slotted eye, blind hole, projection can make the suspension jet that transports through described spigot surface become unstable.
In order further to strengthen the expansion rapidly of jet, if when for example coarse surface orientation being become helix shape, then described coarse surface also can exert an influence to the formation of vortex.In addition, the centrifugal force that produces when rotating by jet, lighter gas is transported towards the direction of leading to the jet-core region.
Another kind method is that the suspension jet through quickening is transferred by having portion's section of the passage section of widening continuously, so that make its external diameter and and then make it be become big by the outer surface that gas infiltrates.
Method 3:
If with jet discharge to the coarse spigot surface that for example produces by means of groove, groove, slotted eye, blind hole, projection the time, then described coarse spigot surface can make freely suspension jet (being discharged from the back the passage forming from jet) form vortex and become unstable.At this moment, the gas that jet is added notes surrounds, thereby can absorb this gas.
Another kind method is, the suspension jet of injecting gas is transported by a plurality of, and passage sections of widening to two or three bursts (stairstepping transition) especially are to form additional vortex.
Especially advantageously, also can implement new method when needed to fibrous suspension with higher fiber density (being about 1.2% to 2.5%), described fibrous suspension itself with higher fiber density than conventional fibre density (being about 1%) the mixing of bubble and uniform aspect will cause bigger resistance.
Another advantage of new method is that the change on the required for this reason equipment is convenient to implement.In the technical pattern of favourable flotation unit, jet forms passage and is structured in one or more orifice plate, and that described orifice plate has is columniform in a large number, also can be oval-shaped hole under special circumstances, and these holes have mutually the same size usually.These orifice plates make gas to be discharged from that side infiltration from the hole at the suspension jet.For using said method, it is enough to change this or these orifice plate.Be used to construct the certain methods of suitable orifice plate, also will illustrate.
Description of drawings
According to the signal drawing the present invention and advantage thereof are illustrated.In the accompanying drawing:
Fig. 1 illustrates the flotation cell that is suitable for implementing according to method of the present invention;
Fig. 2 illustrates by mixing arrangement and cuts open the cutaway view that shows;
Fig. 3-Figure 12 illustrates respectively and is used to construct the scheme that the jet that belongs to mixing arrangement forms passage;
Figure 13 illustrates the diffusion part that is specific to mixing arrangement;
Figure 14-17 illustrates various mixing arrangements with non-circular passage section.
The specific embodiment
Shown in Figure 1ly cut the cutaway view that illustrates open by the float tank 10 with oval cross section, described oval in shape is proved to be especially favourable.Fibrous suspension S is pumped into the mixing arrangement 1 from the top under the pressure effect that is higher than environmental pressure.Being laid in described mixing arrangement 1 in the float tank 10 prejudicially and immersing among the fibrous suspension S ' of injecting gas, is favourable.Mixing arrangement 1 comprises at least one jet and forms passage 3, and described jet forms passage 3 and preferably has the circular face that is used as passage section, if possible, can also be oval-shaped.About this jet forms the structure of passage 3 and the details of effect, be illustrated according to other accompanying drawing.In most of the cases, the jet that this mixing arrangement comprises a plurality of percolations abreast forms passage, and the fibrous suspension S that is transfused to promptly is assigned to described jet and forms in the passage.Gas 6 is sucked owing to injecting effect forms the suspension jet that forms in the passage 3 at jet, and mixes with fibrous suspension S.Gas 6 can directly be taken from 2 tops of the flotation froth the float tank 10.Still be in the hybrid channel 7 in the mixing arrangement 1, be used to further mist and suspension.It ends at this and turns to diffusion part 11, turn in the diffusion part 11 described, the suspension deflection of injecting gas about 90 °, realize flatly and be distributed on the whole circumference (360 °).
The flotation froth 2 that contains solid is collected in the foam tank 12 and quilt is made the float tank that waste material is handled, continued to handle or be fed to next flotation level (not shown).The fibrous suspension that purifies through floatation, i.e. acceptable material A, transported by the bottom from float tank 10 this moment, they or in other flotation cell by flotation once more, perhaps be transported to the next process of preparation material.
Fig. 2 illustrates by mixing arrangement 1 and cuts the cutaway view that illustrates open.The suspension S jet of flowing through forms passage 3.When suspension S is used as 4 discharges of suspension jet, arrive the open region that is entered by gas 6.The expansion rapidly or the bump of suspension jet 4 cause above-mentioned favourable effect.Suspension jet 4 is continued transported in the hybrid channel 7 of laying in the downstream immediately.Mixing and solid being pooled in the bubble of suspension and bubble can further be improved by widening passage section at this.Therefore, exist 14 (the stairstepping transition) of widening of sudden change this moment in hybrid channel 7, and it has caused the vortex of local restricted.Therefore, but provide to be particularly useful for bubble that fragmentation looks too big and/or impurity is pooled to energy needed on the bubble though this vortex has increased pressure loss and increased the energy requirement of this method.As required, a plurality of stairstepping transition being set in a flow channel, also is favourable.
Jet in accompanying drawing 3 and Fig. 4 forms passage 3, is made up of two portion's sections respectively, and wherein first of streamwise section is designed to acceleration region, and in described acceleration region, passage section dwindles gradually.At this, can passage section be dwindled so gradually, that is, make it possible to reach 10 to 15m/s average jet velocity.Jet forms passage 3, at the technique device that is used for implementing this method, can be a section of orifice plate, and described orifice plate is shown in Figure 3 at this, but obviously also can be used in other the scheme.Fig. 3 illustrates the convergent of a kind of taper of being convenient to make that is used for this first section, and cuts open the longitudinal cross-section shape (Fig. 4) of the spill of showing by passage, and the advantage aspect the energy can be provided when pressure can be converted to kinetic energy.Described shape can also be a daraf(reciprocal of farad) that nozzle form.
Jet forms second section of passage 3, has influence on the angle of the jet release that is discharged from.Described second section can for example be columniform (Fig. 3), perhaps for example tapered expansion (Fig. 4).The length L 2 of this section strives reaching 1 to 20mm, and cone angle alpha (Fig. 4) strives reaching 3 to 10 °, if possible, can also reach 30 °.If this cone angle alpha relatively flat, for example smaller or equal to 8 °, the suspension jet can be adjacent to conical walls and broaden.Fig. 5 illustrates the assembled scheme of these two measures, and wherein the ratio of length L 2/L3 (cylindrical/taper shape) advantageously is chosen for 0.1 to 10.According to Fig. 6, the part of second section in the downstream has stairstepping transition 14, and described stairstepping transition 14 can have between 1.1 and 3, and especially advantageously the diameter between 1.2 and 2 compares D3/D2.In the example of Fig. 7, the part in second downstream of section after stairstepping transition 14 and is configured to taper shape similarly among Fig. 4 and Fig. 5.
Fig. 8 shows a kind made from swiftly flowing suspension jet and forms in the portion's section that is right after acceleration region of passage 3 at jet, produces the method that contacts with coarse surface 13, and wherein roughness depth is preferably between 0.5 and 5.In this way, in the suspension of flowing through, form eddy current or further strengthen existing eddy current.The roughening (having addressed: groove, groove, slotted eye, blind hole, projection) that has many methods to produce to be applicable to herein.At this, also can be limited in other place to roughening, for example according to Fig. 9, have the dark cannelure of 1mm of 2mm length, be exactly described indivedual place.Can key be produce effectively " disturbance " to the suspension jet.
As shown in Figure 10 and Figure 11, roughening can influence jet direction, for example, plays aligning effect (and the surface area of jet becomes big at this moment) according to Figure 10, perhaps according to Figure 11, for example by the groove 16 of helix shape, produces vortex along the circumferential direction.This vortex also can be with it differently for example by having towards the projection generation of the spigot surface of circumferencial direction sloped position.A kind of special passage section shown in Figure 12.In this example, roughening is produced by type in a kind of star 15, and type 15 preferably has the roughness depth H between 0.5mm and 5mm in the described star.Type 15 can be point-blank or with tangential component in the star, runs through to wire jet formation passage (referring to Figure 11) especially in the shape of a spiral.
As mentioned above, the advantage that can provide is that the suspension jet of discharging from jet formation passage 3 can incide on the coarse surface.Because supply gas 6 here, the vortex of strengthening owing to roughening can mix better gas-liquid and plays an important role.In with the example shown in Figure 13, carry out the diffusion part 17 of the function of hybrid channel 7, be provided with coarse surface 13 and 13 '.Its structure can design with according to illustrated similar of Fig. 8 to Figure 12.Two the stairstepping transition 14 and 14 of this diffusion in part 17 ', be used to strengthen the infiltration of suspension jet 4 and gas 6 and formation and distribute suitable bubble.
The most of passage sections that preferably make in the mixing arrangement 1, especially jet form passage 3 are circular.But can therewith differently especially in hybrid channel 7, provide above-mentioned advantage.Figure 14 to Figure 17 illustrates the view of example, in described view, and the flow direction contrary of direction of visual lines and suspension.These examples illustrate, and the passage after the stairstepping transition can be designed to square (Figure 14), triangle (Figure 15), hexagon (Figure 16) or pentagon (Figure 17).Because these polygonal shapes, the liquidity ratio on the suspension jet circumference is considered to inequality, and jet thereby contain further impels the labile pulse of expansion rapidly to dash.At this, the outer wall of the circular passage section of upstream can be tangent with polygonal part, thus the widening of the formula that can not occur in this position suddenling change.
Scheme at the mixing arrangement shown in Fig. 2 to Figure 17 is appreciated that into embodiment, its feature also can with concrete draw different herein, make up mutually.
Be used for the floatation equipment of papermaking, fibrous suspension a plurality of flotation cells 10 of flowing through successively mostly are until reaching desired whiteness.
Claims (8)
1. one kind is used for by the device of floatation from fibrous suspension removal impurity, it comprises at least one flotation cell (10) and at least one can be flow through and have the mixing arrangement (1) of at least one jet formation passage (3) to be used to import gas (6) by suspension (S), and comprise at least one pipeline that is used to discharge the floating foam (2) of formed flotation in addition and at least one is used to export the pipeline of the certified products (A) that purified, it is characterized in that, described jet form passage (3) have streamwise at least portion's segmentation ground convergent passage section and have the surface of local roughness (13) at least, thereby make the fibrous suspension (S) that flows through described jet formation passage (3) be accelerated and form eddy current.
2. according to the described device of claim 1, it is characterized in that, described jet forms passage (3) and has the passage section of streamwise convergent at input, after the passage section of described convergent the downstream be invariable, have length between 1 and 30mm between between the passage section of pref. cylindrical.
3. according to the described device of claim 2, it is characterized in that, described jet forms passage (3) and has the passage section of streamwise convergent at input, after the passage section of described convergent the downstream be invariable, have between 3 and 20mm between the passage section of pref. cylindrical.
4. according to claim 1 or 2 described devices, it is characterized in that described jet forms passage (3) and has the passage section of streamwise with the tapered expansion of coning angle between 2 ° and 30 ° at output.
5. according to claim 1 or 2 described devices, it is characterized in that described jet forms passage (3) and has the passage section of streamwise with the tapered expansion of coning angle between 3 ° and 8 ° at output.
6. according to the described device of claim 1, it is characterized in that described mixing arrangement (1), has at least one and comprises the hybrid channel (7) of local roughness surface (13) at least in the position of injecting gas (6) in the downstream.
7. according to claim 1 or 6 described devices, it is characterized in that roughening is at least 0.3mm by roughness depth (H) and is up to the groove of 5mm, groove, slotted eye, blind hole or projection and produces.
8. according to claim 1 or 6 described devices, it is characterized in that, roughening by trend or layout vertically and circumferencial direction groove, groove, slotted eye or the projection of extending and form thus screw line produce.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009040318A DE102009040318A1 (en) | 2009-09-05 | 2009-09-05 | Method for removing impurities from waste paper suspension, involves forming suspension jet, and pulling surface of suspension jet accessible to supplied gas during or after discharge from jet forming channel |
| DE102009040318.3 | 2009-09-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201891043U true CN201891043U (en) | 2011-07-06 |
Family
ID=43536112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020520068XU Expired - Fee Related CN201891043U (en) | 2009-09-05 | 2010-09-06 | Flotation device for removing impurities from fiber suspension through flotation process |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN201891043U (en) |
| DE (1) | DE102009040318A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110817294A (en) * | 2019-10-31 | 2020-02-21 | 浙江工业大学 | Conical spiral bubble conveying device and preparation method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3120202C2 (en) | 1981-05-21 | 1986-06-26 | J.M. Voith Gmbh, 7920 Heidenheim | Device for deinking waste paper through flotation |
| DE3144386C2 (en) * | 1981-11-07 | 1983-12-29 | J.M. Voith Gmbh, 7920 Heidenheim | Injector flotation apparatus |
| DE3245847C1 (en) * | 1982-12-10 | 1984-11-08 | E. & M. Lamort S.A., Vitry-le-François, Marne | Device for floating suspensions |
| CH665962A5 (en) * | 1985-07-19 | 1988-06-30 | Escher Wyss Gmbh | GASIFICATION DEVICE FOR A FLOTATION DEVICE AND ITS USE. |
| DE4314507C1 (en) * | 1993-05-03 | 1994-06-23 | Voith Gmbh J M | Flotation facility injector |
| DE4414272A1 (en) * | 1994-04-23 | 1995-10-26 | Erz & Kohleflotation Gmbh | Device for gassing a suspension |
| AT501976B1 (en) * | 2005-05-25 | 2007-03-15 | Andritz Ag Maschf | DEVICE FOR FLOTING A LIQUID |
| DE102008056040A1 (en) * | 2008-11-05 | 2010-05-06 | Voith Patent Gmbh | Method for removing contaminants from aqueous fiber suspension, particularly waste paper suspension, involves introducing inner flow of gas in inner side of flow of fiber suspension, where open jet is formed at fiber suspension |
-
2009
- 2009-09-05 DE DE102009040318A patent/DE102009040318A1/en not_active Withdrawn
-
2010
- 2010-09-06 CN CN201020520068XU patent/CN201891043U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110817294A (en) * | 2019-10-31 | 2020-02-21 | 浙江工业大学 | Conical spiral bubble conveying device and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009040318A1 (en) | 2011-03-10 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110706 Termination date: 20130906 |