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EP1043061B1 - Dispersing device - Google Patents

Dispersing device Download PDF

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Publication number
EP1043061B1
EP1043061B1 EP00106283A EP00106283A EP1043061B1 EP 1043061 B1 EP1043061 B1 EP 1043061B1 EP 00106283 A EP00106283 A EP 00106283A EP 00106283 A EP00106283 A EP 00106283A EP 1043061 B1 EP1043061 B1 EP 1043061B1
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EP
European Patent Office
Prior art keywords
dispersing
drum
suspension
dispersing device
tool
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Expired - Lifetime
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EP00106283A
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German (de)
French (fr)
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EP1043061A1 (en
Inventor
Guntram Krettek
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/94—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary cylinders or cones
    • B01F27/941—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary cylinders or cones being hollow, perforated or having special stirring elements thereon

Definitions

  • the present invention relates to a dispersing device having the features of the preamble of claim 1.
  • Dispersing devices are used to mix a particular powdery solid and a liquid together so that there is a dispersion or suspension.
  • Conventional dispersing devices are constructed so as to include a stationary container having a solids supply means, a liquid supply means and a slurry discharge means in which a rotary dispersing tool is arranged.
  • the dispersing tool is an agitator, which can be designed in different ways and can rotate at different rotational speeds.
  • a dispersing device is known.
  • the known dispersing device has a rotating drum, on the inside of which spiral grooves are arranged.
  • a solution of a surface-active substance is introduced into the drum by means of pressure and fed to the inner surface thereof, a thin foam layer forming uniformly here.
  • a solid is introduced into the drum via the solids feed device and introduced into the formed foam layer and mixed into it. The corresponding mixture then moves along the spiral grooves to the discharge device.
  • a dispersing device having the features of the preamble of claim 1 is known.
  • the solid and the liquid are mixed in advance and introduced into the drum via a feed device.
  • a feed device At the tube of the feeder there are a plurality of radially extending dispersing elements in the form of superimposed and spaced agitators.
  • the finished suspension is aspirated via a suspension discharge device in the form of a suction nozzle, which is inserted through a central opening in the upper end region of the drum.
  • the present invention has for its object to provide a dispersing specified in the preamble of claim 1 species having a particularly high efficiency.
  • the vertically arranged drum is open at the top and has an overflow for the suspension produced.
  • the suspension enters the annular gap between the rotating drum and the stationary housing wall down to the Suspensionsabloominnate, which is preferably provided on the housing bottom.
  • An essential component of the dispersing device designed according to the invention is the rotating drum arranged in the housing, by means of which a particularly good mixing or swirling effect between solid particles and liquid is achieved. As a result, dead spaces in the stationary container wall are avoided.
  • the device has the advantage that the dispersing tool can optionally be formed stationary or rotatable. Thus, the swirling effect achieved by the stationary dispersing blade can be further improved by rotating it, so that even in the central region of the drum, any dead space which may arise can be completely switched off.
  • Another advantage of the invention is that caused by the rotating drum air bubbles can be largely displaced.
  • the device therefore has an additional degassing effect.
  • the direction of rotation of the drum is preferably selectable. This also applies to the direction of rotation of the dispersing tool. For example, both can rotate in the same direction but also in opposite directions.
  • the dispersing tool As far as the formation of the dispersing tool is concerned, a variety of embodiments are possible if a turbulence or stirring effect is achieved thereby.
  • at least one dispersing blade which travels in the radial direction is provided.
  • the dispersing tool has a plurality of dispersing blades arranged one above the other, so that they largely cover the entire height of the drum.
  • the solids and / or liquid supply means may be formed as a dispersing tool.
  • corresponding dispersing vanes are arranged on the outer sides of the tubes or shafts.
  • the drum drive shaft may be provided with corresponding dispersing blades. In the latter case, the dispersing tool rotates together with the drum.
  • the dispersing tool is usually arranged stationary.
  • the Feststoffzu slaughter classroom is preferably a shaft or a tube.
  • the shaft or tube expediently extends from the upper end of the housing down into the drum so far that feed of the solid (powder) takes place in the lower part of the drum.
  • the solid feed into the tube or into the shaft can for example via a big bag or a bag emptying device and a downstream metering screw done.
  • the metering screw may extend into the well or tube. It expediently starts from a hopper. A heating of the pipe or shaft is appropriate.
  • the liquid supply device is preferably a tube, which is likewise introduced from above through the housing into the lower region of the drum.
  • the end portion of the liquid tube may be shaped accordingly to achieve a preferred liquid dispensing direction, for example against the drum wall.
  • the end region of the tube is preferably formed obliquely or horizontally.
  • the drum drive shaft extending through the drum carries a spray plate onto which the liquid feed pipe is directed, i.e.
  • the end portion of the inlet pipe extends obliquely inward toward the drum axis.
  • the Suspensionsab 2009 is preferably in the bottom of the housing. It may be a pipe, which starts from the radially outer region of the housing bottom.
  • the dispersing device has a circulation system for returning the suspension discharged through the suspension discharge device into the drum via the liquid supply device.
  • this system it is possible to recycle the produced suspension until the desired suspension quality is present.
  • solid and liquid can be metered in permanently. Upon reaching the desired suspension quality, the solid and liquid supply is stopped and the drum emptied.
  • a particularly preferred embodiment of the invention is characterized in that the dispersing device is simultaneously designed as a classifying device and has a discharge device for the classified suspension.
  • This embodiment has the great advantage that a single device is required to perform a dispersing operation and a subsequent classifying operation.
  • a conventional system for dispersing and subsequent classifying two separate devices are used for this purpose, namely on the one hand with a conventional agitator equipped with dispersing or mixing device with stationary container and on the other hand, a classifier in the form of a centrifuge.
  • the above-described dispersing device according to the invention can also be used for classifying if it is provided with a discharge device for the classified suspension or is operated in the overflow method.
  • the inner wall of the drum is preferably provided with chambers which receive the coarse fraction separated by the classification process, which is dissolved again in a subsequent purification step and, if necessary after a grinding process, reintroduced into the suspension to be classified.
  • the dispersing tool is expediently designed so that it can be used as a cleaning tool in the cleaning stage.
  • the at least one dispersing blade acts here as a cleaning knife with which the sediment is dissolved in a mechanical manner.
  • this is preferably off and foldable so that it can be activated or deactivated in the respective phase.
  • the dispersing phase it is unfolded, folded during the classifying phase and unfolded again during the subsequent cleaning phase. Collapsed means here that the wing occupies no radial position more.
  • the Feststoffzu slaughter 2015, the liquid supply and / or the discharge device for the classified suspension into the drum and again out of this movable, in particular pivotable.
  • the devices can be arranged inside or outside the drum in order to avoid disturbing influence.
  • the discharge device for the classified suspension is pivoted out of the drum during the dispersion phase and the cleaning phase.
  • Yet another embodiment of the invention is characterized in that the dispersing tool in the drum in the axial and / or radial direction is movable. This embodiment makes it possible to further increase the variability of the device, since now any points within the drum can be achieved with the dispersing tool and / or cleaning tool.
  • the suspension is withdrawn from the drum via the suspension removal device and reintroduced into the drum via the liquid feed device.
  • the liquid supply means may be provided with the at least one dispersing blade which in this embodiment at the same time designed as a cleaning knife.
  • the solution according to the invention thus provides a continuous system, so that in contrast to the prior art by the existing container geometries no fixed quantities are prescribed. According to the invention, a variation of the solids content is possible on a large scale. In the case of the combination variant, it is also possible to carry out a dilution of the suspension in the same device.
  • the dispersing and classifying process can be carried out at different speeds. Both processes can also be realized with different directions of rotation of the drum.
  • the feature can be realized that the at least one dispersing blade (cleaning knife) folds up or back in dependence on the direction of rotation. Unfolding is accomplished in the dispersing and cleaning phase, while folding back the classifying phase is achieved in which the drum rotates in opposite directions.
  • FIG. 1 The schematically shown in Figure 1 in vertical section Dispergiervoriques has a stationary housing 1, in which a vertically arranged drum 2 is provided, which is driven by a shaft 7 so that it rotates within the housing 1.
  • the drum 2 is open at the top and has an overflow shown at 12, via which the suspension produced in the drum 2 passes to a suspension discharge line 10 originating from the bottom of the housing.
  • a powder feeder with a powder hopper 4, a metering screw 5, which is arranged in a feed tube, and a powder well 6, which extends from the top into the housing 1 and into the drum 2, serves to supply a solid which is in the dispersing device to be transferred under suspension of fluid into a suspension.
  • the solid may be, for example, SiO 2 powder.
  • the powder chute 6 extends into the lower region of the drum 2 and has at its lower end a corresponding outlet opening for the powder.
  • a liquid supply means 8 in the form of a water supply pipe also extends through the top of the housing to the lower portion of the drum 2. At the lower end, the feed tube is bent radially outwardly so that the supplied water is directed radially outwardly toward the drum outer wall becomes.
  • the drum 2 has in its radially outer region a number of stacked receiving chambers 3, which are shown in Figure 1 on the right side of the drum 2. The operation of these chambers will be explained later.
  • FIG. 1 shows the dispersing blades 1 in the unfolded state in which they extend into the chambers 3 in. In addition to their Verwirbelungsfunktion these dispersing wings have a further task, which will be explained later.
  • the dispersing device shown here also serves as a classifying device and for this purpose also has a discharge device for the classified suspension, which is designed in the form of a discharge tube 9 which extends up to the upper edge region of the open drum 2.
  • the device works in the following way.
  • the prepared suspension When the prepared suspension is to be classified, it is withdrawn from the storage and passed through the feed tube 8 in the lower portion of the drum in the direction of the drum wall in a continuous process.
  • the speed of the drum 2 In the Klassierphase the speed of the drum 2 is set to Klassierwindress.
  • the unfolded dispersing vanes 11 are folded inwardly against the outer wall of the powder chute 6.
  • the drum rotates with the corresponding one Classifying speed, whereby coarse particles of the suspension to be classified are thrown outwards against the inner wall of the drum in the chambers 3 arranged there. In the chambers, a solid cake forms, which gets thicker as the classifying process progresses.
  • the classified suspension is withdrawn via the discharge pipe 9.
  • This discharge pipe 9 is otherwise pivotally formed, so that it is pivoted into the housing only in the Klassierphase.
  • the classified suspension can be recycled and introduced via the tube 8 again in the drum. If a corresponding quality of the classified suspension is achieved, the classification process is stopped. The remainder of the suspension remaining in the drum can now be withdrawn via a discharge not shown.
  • the rotating cake is released by the fixed knives.
  • the corresponding cleaning effect can be supported by supplying water through the pipe 8. It forms again in the drum 2, a suspension of coarse fraction and water, which can be removed.
  • the coarse fraction can be ground and the resulting suspension reintroduced into the system.
  • After completion of the cleaning phase can be started again with a dispersion phase.
  • the dispersing device illustrated schematically in vertical section in FIG. 2 differs from that of FIG. 1 only in a few features, so that the same reference numbers as in FIG. 1 are used to designate the same features were used.
  • the dispersing device also comprises a stationary housing 1 with a vertically arranged drum 2, which is rotated by a shaft 7.
  • a solids supply means is formed in the form of a tube 17 extending through the top of the housing 1 into the lower portion of the drum 2.
  • a metering screw 18 is arranged in the tube 17 in the tube.
  • the tube 17 is at its upper end in a hopper 19 over.
  • the metering screw 18 delivers powder into the drum.
  • the liquid supply means is formed in the form of a supply pipe 8 which also extends through the top of the housing 1 to the lower portion of the rotary drum 2. In the lower region, the tube 8 is bent obliquely inwards and downwards, as shown at 13. As a result, the supplied via the pipe 8 liquid (water) is guided on a spray plate 14 which is fixedly connected to the drum shaft 7. In this way, a sputtering effect with respect to the supplied liquid and the solid is achieved.
  • a special dispersing tool 15 is provided, which is formed in the shape of a rod or rods extending through the top of the housing to the lower portion of the rotating drum 2.
  • Three superimposed dispersing vanes 16 are provided on the rod, which can be folded in and out and are shown in their unfolded position in FIG.
  • the dispersing blades 16 function as cleaning blades, which engage in the chambers 3 and release the cake deposited there.
  • the device can be used as a batch or inline machine.
  • the suspension discharge is possible with and without pressure.
  • the collection of the solid (powder) can be done by means of generated negative pressure (rotating drum), whereby the dust load of the environment is reduced. With regard to the dispersing effect, infinite influence is possible.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

Dispersing device comprises a housing (1), a rotating drum (2) having a vertical axis arranged in the housing, a solid feed device (4, 5, 6) extending into the drum, a liquid feed device (8) extending into the drum, a suspension removal device (10) and a dispersing tool (15) extending into the drum with radial wings (11). Preferred Features: The dispersing tool can be rotated. The inner wall of the drum is provided with chambers. The solid feed device has a shaft (6). The liquid feed device is a pipe.

Description

Die vorliegende Erfindung betrifft eine Dispergiervorrichtung mit den Merkmalen des Oberbegriffs von Patentanspruch 1.The present invention relates to a dispersing device having the features of the preamble of claim 1.

Dispergiervorrichtungen dienen dazu, einen insbesondere pulverförmigen Feststoff und eine Flüssigkeit so miteinander zu vermischen, daß sich eine Dispersion bzw. Suspension ergibt. Herkömmliche Dispergiervorrichtungen sind dabei so aufgebaut, daß sie einen stationären Behälter mit einer Feststoffzuführeinrichtung, einer Flüssigkeitszuführeinrichtung und einer Suspensionsabführeinrichtung aufweisen, in dem ein rotierendes Dispergierwerkzeug angeordnet ist. Bei dem Dispergierwerkzeug handelt es sich hierbei um ein Rührwerk, das verschiedenartig ausgebildet sein und mit unterschiedlichen Drehzahlen rotieren kann.Dispersing devices are used to mix a particular powdery solid and a liquid together so that there is a dispersion or suspension. Conventional dispersing devices are constructed so as to include a stationary container having a solids supply means, a liquid supply means and a slurry discharge means in which a rotary dispersing tool is arranged. The dispersing tool is an agitator, which can be designed in different ways and can rotate at different rotational speeds.

Aus der SU-1 456 318 ist eine Dispergiervorrichtung bekannt. Die bekannte Dispergiervorrichtung weist eine rotierende Trommel auf, an deren Innenseite spiralförmige Nuten angeordnet sind. Über die Flüssigkeitszuführeinrichtung wird eine Lösung einer oberflächenaktiven Substanz mittels Druck in die Trommel eingeführt und der Innenfläche derselben zugeführt, wobei sich hier eine dünne Schaumschicht gleichmäßig ausbildet. Ein Feststoff wird über die Feststoffzuführeinrichtung in die Trommel eingeführt und in die gebildete Schaumschicht eingeführt sowie in diese eingemischt. Das entsprechende Gemisch bewegt sich dann entlang den spiralförmigen Nuten zur Abführeinrichtung.From SU-1 456 318 a dispersing device is known. The known dispersing device has a rotating drum, on the inside of which spiral grooves are arranged. Via the liquid supply device, a solution of a surface-active substance is introduced into the drum by means of pressure and fed to the inner surface thereof, a thin foam layer forming uniformly here. A solid is introduced into the drum via the solids feed device and introduced into the formed foam layer and mixed into it. The corresponding mixture then moves along the spiral grooves to the discharge device.

Aus der DE-A-1 207 347 ist eine Dispergiervorrichtung mit den Merkmalen des Oberbegriffs von Patentanspruch 1 bekannt. Bei dieser bekannten Dispergiervorrichtung werden der Feststoff und die Flüssigkeit im Vorfeld gemischt und über eine Zuführeinrichtung in die Trommel eingeführt. Am Rohr der Zuführeinrichtung befinden sich mehrere sich radial erstreckende Dispergierelemente in der Form von übereinander und mit Abstand voneinander angeordneten Rührwerken. Die fertige Suspension wird über eine Suspensionsabführeinrichtung in der Form eines Saugstutzens, der durch eine mittlere Öffnung in den oberen Endbereich der Trommel eingeführt ist, abgesaugt.From DE-A-1 207 347 a dispersing device having the features of the preamble of claim 1 is known. In this known dispersing device, the solid and the liquid are mixed in advance and introduced into the drum via a feed device. At the tube of the feeder there are a plurality of radially extending dispersing elements in the form of superimposed and spaced agitators. The finished suspension is aspirated via a suspension discharge device in the form of a suction nozzle, which is inserted through a central opening in the upper end region of the drum.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Dispergiervorrichtung der im Oberbegriff von Patentanspruch 1 angegebenen Art zu schaffen, die einen besonders hohen Wirkungsgrad besitzt.The present invention has for its object to provide a dispersing specified in the preamble of claim 1 species having a particularly high efficiency.

Diese Aufgabe wird bei einer Dispergiervorrichtung der angegebenen Art durch die kennzeichnenden Merkmale von Patentanspruch 1 gelöst.This object is achieved in a dispersing device of the type specified by the characterizing features of claim 1.

Bei der erfindungsgemäß ausgebildeten Dispergiervorrichtung ist die vertikal angeordnete Trommel oben offen und weist einen Überlauf für die erzeugte Suspension auf. Über den Überlauf gelangt die Suspension in den Ringspalt zwischen rotierender Trommel und stationärer Gehäusewand nach unten bis zur Suspensionsabführeinrichtung, die vorzugsweise am Gehäuseboden vorgesehen ist.In the dispersing device designed according to the invention, the vertically arranged drum is open at the top and has an overflow for the suspension produced. About the overflow, the suspension enters the annular gap between the rotating drum and the stationary housing wall down to the Suspensionsabführeinrichtung, which is preferably provided on the housing bottom.

Wesentlicher Bestandteil der erfindungsgemäß ausgebildeten Dispergiervorrichtung ist die im Gehäuse angeordnete rotierende Trommel, durch die ein besonders guter Vermischungs- bzw. Verwirbelungseffekt zwischen Feststoffpartikeln und Flüssigkeit erzielt wird. Hierdurch werden Toträume im Bereich der stationären Behälterwand vermieden. Die Vorrichtung hat den Vorteil, daß das Dispergierwerkzeug wahlweise stationär oder drehbar ausgebildet sein kann. So kann der vom stationären Dispergierflügel erzielte Verwirbelungseffekt durch Rotierenlassen desselben weiter verbessert werden, so daß auch im zentralen Bereich der Trommel ein möglicherweise entstehender Totraum absolut ausgeschaltet werden kann.An essential component of the dispersing device designed according to the invention is the rotating drum arranged in the housing, by means of which a particularly good mixing or swirling effect between solid particles and liquid is achieved. As a result, dead spaces in the stationary container wall are avoided. The device has the advantage that the dispersing tool can optionally be formed stationary or rotatable. Thus, the swirling effect achieved by the stationary dispersing blade can be further improved by rotating it, so that even in the central region of the drum, any dead space which may arise can be completely switched off.

Ein weiterer Vorteil der Erfindung besteht darin, daß durch die rotierende Trommel entstandenen Luftblasen weitgehend verdrängt werden können. Die Vorrichtung hat daher eine zusätzliche Entgasungswirkung.Another advantage of the invention is that caused by the rotating drum air bubbles can be largely displaced. The device therefore has an additional degassing effect.

Die Drehrichtung der Trommel ist vorzugsweise wählbar. Dies trifft auch auf die Drehrichtung des Dispergierwerkzeuges zu. So können beide beispielsweise gleichsinnig aber auch gegensinnig rotieren.The direction of rotation of the drum is preferably selectable. This also applies to the direction of rotation of the dispersing tool. For example, both can rotate in the same direction but also in opposite directions.

Was die Ausbildung des Dispergierwerkzeuges anbetrifft, so ist eine Vielzahl von Ausführungsformen möglich, wenn hierdurch ein Verwirbelungs- bzw. Rühreffekt erzielt wird. Hierzu ist mindestens ein sich in radialer Richtung perstreckender Dispergierflügel vorgesehen. Vorzugsweise besitzt das Dispergierwerkzeug eine Vielzahl von übereinander angeordneten Dispergierflügeln, so daß diese weitgehend die gesamte Höhe der Trommel abdecken.As far as the formation of the dispersing tool is concerned, a variety of embodiments are possible if a turbulence or stirring effect is achieved thereby. For this purpose, at least one dispersing blade which travels in the radial direction is provided. Preferably, the dispersing tool has a plurality of dispersing blades arranged one above the other, so that they largely cover the entire height of the drum.

Bei der erfindungsgemäßen Lösung ist es nicht zwingend erforderlich, daß ein gesondertes Dispergierwerkzeug vorgesehen ist. Vielmehr kann auch die Feststoff- und/oder Flüssigkeitszuführeinrichtung als Dispergierwerkzeug ausgebildet sein. Bei dieser Ausführungsform sind beispielsweise an den Außenseiten der Rohre bzw. Schächte entsprechende Dispergierflügel angeordnet. Auch kann die Trommelantriebswelle mit entsprechenden Dispergierflügeln versehen sein. Im letztgenannten Fall rotiert das Dispergierwerkzeug zusammen mit der Trommel. Bei den Ausführungsformen, bei denen die Feststoff- und/oder Flüssigkeitszuführeinrichtungen als Dispergierwerkzeug ausgebildet sind, ist das Dispergierwerkzeug in der Regel stationär angeordnet.In the solution according to the invention, it is not absolutely necessary that a separate dispersing tool is provided. Rather, the solids and / or liquid supply means may be formed as a dispersing tool. In this embodiment, for example, corresponding dispersing vanes are arranged on the outer sides of the tubes or shafts. Also, the drum drive shaft may be provided with corresponding dispersing blades. In the latter case, the dispersing tool rotates together with the drum. In the embodiments in which the solids and / or liquid feeders are designed as dispersing tool, the dispersing tool is usually arranged stationary.

Die Feststoffzuführeinrichtung ist vorzugsweise ein Schacht oder ein Rohr. Der Schacht oder das Rohr erstreckt sich zweckmäßigerweise vom oberen Gehäuseende aus nach unten soweit in die Trommel hinein, daß eine Zuführung des Feststoffes (Pulvers) im unteren Teil der Trommel erfolgt. Die Feststoffzuführung in das Rohr oder in den Schacht kann beispielsweise über einen Big-Bag oder eine Sackentleerungsvorrichtung und eine nachgeschaltete Dosierschnecke erfolgen. Die Dosierschnecke kann sich in den Schacht oder das Rohr hinein erstrecken. Sie geht zweckmäßigerweise von einem Fülltrichter aus. Eine Beheizung des Rohres oder Schachtes ist zweckmäßig.The Feststoffzuführeinrichtung is preferably a shaft or a tube. The shaft or tube expediently extends from the upper end of the housing down into the drum so far that feed of the solid (powder) takes place in the lower part of the drum. The solid feed into the tube or into the shaft can for example via a big bag or a bag emptying device and a downstream metering screw done. The metering screw may extend into the well or tube. It expediently starts from a hopper. A heating of the pipe or shaft is appropriate.

Bei der Flüssigkeitszuführeinrichtung handelt es sich vorzugsweise üm ein Rohr, das ebenfalls von oben durch das Gehäuse in den unteren Bereich der Trommel eingeführt ist. Der Endbereich des Flüssigkeitsrohres kann entsprechend geformt sein, um eine bevorzugte Flüssigkeitsabgaberichtung, beispielsweise gegen die Trommelwand, zu erreichen. So ist der Endbereich des Rohres vorzugsweise schräg oder horizontal ausgebildet.The liquid supply device is preferably a tube, which is likewise introduced from above through the housing into the lower region of the drum. The end portion of the liquid tube may be shaped accordingly to achieve a preferred liquid dispensing direction, for example against the drum wall. Thus, the end region of the tube is preferably formed obliquely or horizontally.

Bei einer speziellen Ausführungsform der Erfindung trägt die sich durch die Trommel erstreckende Trommelantriebswelle einen Spritzteller, auf den das Flüssigkeitszulaufrohr gerichtet ist, d.h. in diesem Fall erstreckt sich der Endbereich des Zulaufrohres schräg nach innen zur Trommelachse hin.In a particular embodiment of the invention, the drum drive shaft extending through the drum carries a spray plate onto which the liquid feed pipe is directed, i.e. In this case, the end portion of the inlet pipe extends obliquely inward toward the drum axis.

Die Suspensionsabführeinrichtung befindet sich vorzugsweise im Boden des Gehäuses. Es kann sich hierbei um eine Rohrleitung handeln, die vom radial äußeren Bereich des Gehäusebodens ausgeht.The Suspensionsabführeinrichtung is preferably in the bottom of the housing. It may be a pipe, which starts from the radially outer region of the housing bottom.

Bei einer besonders bevorzugten Ausführungsform der Erfindung weist die Dispergiervorrichtung ein Kreislaufsystem zur Rückführung der durch die Suspensionsabführeinrichtung abgeführten Suspension über die Flüssigkeitszuführeinrichtung in die Trommel auf. Bei diesem System ist es möglich, die erzeugte Suspension im Kreislauf zu führen, bis die gewünschte Suspensionsqualität vorhanden ist. Hierbei können permanent Feststoff und Flüssigkeit zudosiert werden. Bei Erreichen der gewünschten Suspensionsqualität wird die Feststoff- und Flüssigkeitszufuhr gestoppt und die Trommel entleert.In a particularly preferred embodiment of the invention, the dispersing device has a circulation system for returning the suspension discharged through the suspension discharge device into the drum via the liquid supply device. In this system, it is possible to recycle the produced suspension until the desired suspension quality is present. Here, solid and liquid can be metered in permanently. Upon reaching the desired suspension quality, the solid and liquid supply is stopped and the drum emptied.

Eine besonders bevorzugte Ausführungsform der Erfindung zeichnet sich dadurch aus, daß die Dispergiervorrichtung gleichzeitig als Klassiervorrichtung ausgebildet ist und eine Abführeinrichtung für die klassierte Suspension aufweist. Diese Ausführungsform hat den großen Vorteil, daß eine einzige Vorrichtung erforderlich ist, um einen Dispergiervorgang und einen nachfolgenden Klassiervorgang durchzuführen. Mit einem herkömmlichen System zum Dispergieren und anschließenden Klassieren werden hierzu zwei getrennte Vorrichtungen verwendet, nämlich zum einen eine mit einem herkömmlichen Rührwerk ausgestattete Dispergier- bzw. Mischvorrichtung mit stationärem Behälter und zum anderen eine Klassiereinrichtung in Form einer Zentrifuge. Die vorstehend beschriebene erfindungsgemäß ausgebildete Dispergiervorrichtung kann erfindungsgemäß auch zum Klassieren verwendet werden, wenn sie mit einer Abführeinrichtung für die klassierte Suspension versehen ist oder im Überlaufverfahren betrieben wird. Beim Klassieren wird in der Regel mit einer höheren Trommeldrehzahl gearbeitet als beim Dispergieren. Darüber hinaus ist bei dieser Ausführungsform die Innenwand der Trommel vorzugsweise mit Kammern versehen, die den durch den Klassiervorgang abgetrennten Grobanteil aufnehmen, der in einer nachfolgenden Reinigungsstufe wieder gelöst und, ggf. nach einem Mahlvorgang, erneut in die zu klassierende Suspension eingeführt wird. Das Dispergierwerkzeug ist dabei zweckmäßigerweise so ausgebildet, daß es als Reinigungswerkzeug in der Reinigungsstufe eingesetzt werden kann. Der mindestens eine Dispergierflügel wirkt hierbei als Reinigungsmesser, mit dem das Sediment auf mechanische Weise gelöst wird.A particularly preferred embodiment of the invention is characterized in that the dispersing device is simultaneously designed as a classifying device and has a discharge device for the classified suspension. This embodiment has the great advantage that a single device is required to perform a dispersing operation and a subsequent classifying operation. With a conventional system for dispersing and subsequent classifying two separate devices are used for this purpose, namely on the one hand with a conventional agitator equipped with dispersing or mixing device with stationary container and on the other hand, a classifier in the form of a centrifuge. According to the invention, the above-described dispersing device according to the invention can also be used for classifying if it is provided with a discharge device for the classified suspension or is operated in the overflow method. When classifying, a higher drum speed is generally used than during dispersion. In addition, in this embodiment, the inner wall of the drum is preferably provided with chambers which receive the coarse fraction separated by the classification process, which is dissolved again in a subsequent purification step and, if necessary after a grinding process, reintroduced into the suspension to be classified. The dispersing tool is expediently designed so that it can be used as a cleaning tool in the cleaning stage. The at least one dispersing blade acts here as a cleaning knife with which the sediment is dissolved in a mechanical manner.

Um eine Behinderung des Klassiervorganges durch den Dispergierflügel zu vermeiden, ist dieser vorzugsweise aus- und einklappbar, so daß er in der jeweiligen Phase aktiviert oder deaktiviert werden kann. Während der Dispergierphase ist er ausgeklappt, während der Klassierphase eingeklappt und während der nachfolgenden Reinigungsphase wieder ausgeklappt. Eingeklappt soll hier bedeuten, daß der Flügel keine Radialstellung mehr einnimmt.In order to avoid a hindrance of the Klassiervorganges by the dispersing, this is preferably off and foldable so that it can be activated or deactivated in the respective phase. During the dispersing phase, it is unfolded, folded during the classifying phase and unfolded again during the subsequent cleaning phase. Collapsed means here that the wing occupies no radial position more.

Vorzugsweise sind auch die Feststoffzuführeinrichtung, die Flüssigkeitszuführeinrichtung und/oder die Abführeinrichtung für die klassierte Suspension in die Trommel hinein und wieder aus dieser heraus bewegbar, insbesondere schwenkbar. Auch bei dieser Ausführungsform können daher in Abhängigkeit von der jeweiligen Verfahrensphase die Einrichtungen innerhalb oder außerhalb der Trommel angeordnet sein, um ein störende Beeinflussung zu vermeiden. So wird insbesondere die Abführeinrichtung für die klassierte Suspension während der Dispergierphase und Reinigungsphase aus der Trommel heraus geschwenkt.Preferably, the Feststoffzuführeinrichtung, the liquid supply and / or the discharge device for the classified suspension into the drum and again out of this movable, in particular pivotable. Also in this embodiment, therefore, depending on the respective process phase, the devices can be arranged inside or outside the drum in order to avoid disturbing influence. In particular, the discharge device for the classified suspension is pivoted out of the drum during the dispersion phase and the cleaning phase.

Noch eine weitere Ausführungsform der Erfindung zeichnet sich dadurch aus, daß das Dispergierwerkzeug in der Trommel in axialer und/oder radialer Richtung verfahrbar ist. Diese Ausführungsform macht es möglich, die Variabilität der Vorrichtung weiter zu erhöhen, da nunmehr beliebige Punkte innerhalb der Trommel mit dem Dispergierwerkzeug und/oder Reinigungswerkzeug erreichbar sind.Yet another embodiment of the invention is characterized in that the dispersing tool in the drum in the axial and / or radial direction is movable. This embodiment makes it possible to further increase the variability of the device, since now any points within the drum can be achieved with the dispersing tool and / or cleaning tool.

Beim kombinierten Einsatz als Dispergier- und Klassiervorrichtung ist es natürlich ebenfalls möglich, die klassierte Suspension im Kreislauf zu führen. Die Suspension wird hierbei über die Suspensionsabführeinrichtung aus der Trommel abgezogen und über die Flüssigkeitszuführeinrichtung erneut in die Trommel eingeführt. Wie erwähnt, kann die Flüssigkeitszuführeinrichtung mit dem mindestens einen Dispergierflügel versehen sein, der bei dieser Ausführungsform gleichzeitig als Reinigungsmesser ausgebildet ist.When combined use as a dispersing and classifying device, it is of course also possible to recycle the classified suspension. The suspension is withdrawn from the drum via the suspension removal device and reintroduced into the drum via the liquid feed device. As mentioned, the liquid supply means may be provided with the at least one dispersing blade which in this embodiment at the same time designed as a cleaning knife.

Die erfindungsgemäße Lösung sieht somit ein Durchlaufsystem vor, so daß im Gegensatz zum Stand der Technik durch die vorhandenen Behältergeometrien keine festen Mengen vorgeschrieben werden. Erfindungsgemäß ist eine Variation des Feststoffanteiles im großen Umfang möglich. Bei der Kombinationsvariante kann auch eine Verdünnung der Suspension in der gleichen Vorrichtung durchgeführt werden.The solution according to the invention thus provides a continuous system, so that in contrast to the prior art by the existing container geometries no fixed quantities are prescribed. According to the invention, a variation of the solids content is possible on a large scale. In the case of the combination variant, it is also possible to carry out a dilution of the suspension in the same device.

Wie erwähnt, können der Dispergier- und Klassiervorgang mit unterschiedlichen Drehzahlen durchgeführt werden. Beide Vorgänge können auch mit unterschiedlichen Drehrichtungen der Trommel realisiert werden. So kann beispielsweise das Merkmal realisiert sein, daß der mindestens eine Dispergierflügel (Reinigungsmesser) in Abhängigkeit von der Drehrichtung auf- oder zurückklappt. Ein Aufklappen wird in der Dispergier- und Reinigungsphase bewerkstelligt, während ein Zurückklappen der Klassierphase erreicht wird, bei der die Trommel gegensinnig rotiert.As mentioned, the dispersing and classifying process can be carried out at different speeds. Both processes can also be realized with different directions of rotation of the drum. Thus, for example, the feature can be realized that the at least one dispersing blade (cleaning knife) folds up or back in dependence on the direction of rotation. Unfolding is accomplished in the dispersing and cleaning phase, while folding back the classifying phase is achieved in which the drum rotates in opposite directions.

Die Erfindung wird nachfolgend anhand von zwei Ausführungsbeispielen in Verbindung mit der Zeichnung im einzelnen erläutert. Es zeigen:

Figur 1
einen schematischen Vertikalschnitt durch eine als Dispergier- und Klassiervorrichtung ausgebildete Vorrichtung; und
Figur 2
einen schematischen Vertikalschnitt durch eine weitere Ausführungsform einer als Dispergier- und Klassiervorrichtung ausgebildeten Vorrichtung.
The invention will be explained in more detail below with reference to two exemplary embodiments in conjunction with the drawing. Show it:
FIG. 1
a schematic vertical section through a trained as a dispersing and classifying device; and
FIG. 2
a schematic vertical section through a further embodiment of a trained as a dispersing and classifying device.

Die schematisch in Figur 1 im Vertikalschnitt dargestellte Dispergiervorrichtung besitzt ein stationäres Gehäuse 1, in dem eine vertikal angeordnete Trommel 2 vorgesehen ist, die über eine Welle 7 angetrieben wird, so daß sie sich innerhalb des Gehäuses 1 dreht. Die Trommel 2 ist oben offen und weist einen bei 12 gezeigten Überlauf auf, über den die in der Trommel 2 erzeugte Suspension zu einer vom Boden des Gehäuses ausgehenden Suspensionsabführleitung 10 gelangt.The schematically shown in Figure 1 in vertical section Dispergiervorrichtung has a stationary housing 1, in which a vertically arranged drum 2 is provided, which is driven by a shaft 7 so that it rotates within the housing 1. The drum 2 is open at the top and has an overflow shown at 12, via which the suspension produced in the drum 2 passes to a suspension discharge line 10 originating from the bottom of the housing.

Eine Pulverzuführeinrichtung mit einem Pulvertrichter 4, einer Dosierschnecke 5, die in einem Zuführrohr angeordnet ist, und einem Pulverschacht 6, der sich von der Oberseite in das Gehäuse 1 und in die Trommel 2 hinein erstreckt, dient zur Zuführung eines Feststoffes, der in der Dispergiervorrichtung unter Flüssigkeitszufuhr in eine Suspension überführt werden soll. Bei dem Feststoff kann es sich beispielsweise um SiO2-Pulver handeln. Der Pulverschacht 6 erstreckt sich bis in den unteren Bereich der Trommel 2 und weist an seinem unteren Ende eine entsprechende Austrittsöffnung für das Pulver auf. Eine Flüssigkeitszuführeinrichtung 8 in der Form eines Wasserzuführrohres erstreckt sich ebenfalls durch die Oberseite des Gehäuses bis in den unteren Bereich der Trommel 2. Am unteren Ende ist das Zuführrohr radial nach außen gebogen, so daß das zugeführte Wasser radial nach außen in Richtung auf die Trommelaußenwand geführt wird.A powder feeder with a powder hopper 4, a metering screw 5, which is arranged in a feed tube, and a powder well 6, which extends from the top into the housing 1 and into the drum 2, serves to supply a solid which is in the dispersing device to be transferred under suspension of fluid into a suspension. The solid may be, for example, SiO 2 powder. The powder chute 6 extends into the lower region of the drum 2 and has at its lower end a corresponding outlet opening for the powder. A liquid supply means 8 in the form of a water supply pipe also extends through the top of the housing to the lower portion of the drum 2. At the lower end, the feed tube is bent radially outwardly so that the supplied water is directed radially outwardly toward the drum outer wall becomes.

Die Trommel 2 weist in ihrem radial äußeren Bereich eine Reihe von übereinander angeordneten Aufnahmekammern 3 auf, die in Figur 1 an der rechten Seite der Trommel 2 dargestellt sind. Die Funktionsweise dieser Kammern wird später erläutert.The drum 2 has in its radially outer region a number of stacked receiving chambers 3, which are shown in Figure 1 on the right side of the drum 2. The operation of these chambers will be explained later.

An der Außenseite des Pulverschachtes 6 sind schräg nach unten und außen verlaufende Dispergieflügel 11 angeordnet, die ein- und ausklappbar sind. Figur 1 zeigt die Dispergierflügel 1 im ausgeklappten Zustand, in dem sie sich bis in die Kammern 3 hinein erstrecken. Neben ihrer Verwirbelungsfunktion haben diese Dispergierflügel eine weitere Aufgabe, die später erläutert wird.On the outside of the powder chute 6 obliquely downwardly and outwardly extending dispersing vanes 11 are arranged, which can be folded in and out. FIG. 1 shows the dispersing blades 1 in the unfolded state in which they extend into the chambers 3 in. In addition to their Verwirbelungsfunktion these dispersing wings have a further task, which will be explained later.

Die hier dargestellte Dispergiervorrichtung dient gleichzeitig als Klassiervorrichtung und weist hierzu ferner eine Abführeinrichtung für die klassierte Suspension auf, die in der Form eines Abführrohres 9 ausgebildet ist, das sich bis zum oberen Randbereich der offenen Trommel 2 erstreckt.The dispersing device shown here also serves as a classifying device and for this purpose also has a discharge device for the classified suspension, which is designed in the form of a discharge tube 9 which extends up to the upper edge region of the open drum 2.

Die Vorrichtung funktioniert in der folgenden Weise.The device works in the following way.

Bei leerer Trommel 2 werden zum Dispergieren SiO2-Pulver über den Pulverschacht 6 und Wasser über das Zuführrohr 8 in die rotierende Trommel 2 eingeführt. Die Drehzahl der Trommel ist auf Dispergierdrehzahl eingestellt. Durch die rotierende Trommel und die Dispergierflügel 11, von denen drei übereinander angeordnet sind, wird aus dem Pulver und dem zugeführten Wasser eine Suspension gebildet. Bei kontinuierlich befüllter Trommel tritt die Suspension über den Überlauf 12 aus der Trommel aus und gelangt durch den Ringspalt zwischen Trommel und Gehäuse in die Suspensionsabführleitung 10. Sie kann dann in einen geeigneten Speicher geführt oder im Kreislauf über das Rohr 8 wieder in die Dispergiervorrichtung zurückgeführt werden.When the drum 2 is empty, SiO 2 powder is introduced into the rotating drum 2 via the powder tube 6 and water via the feed tube 8 for dispersing. The speed of the drum is set to dispersing speed. By the rotating drum and the dispersing vanes 11, three of which are arranged one above the other, a suspension is formed from the powder and the supplied water. With continuously filled drum, the suspension exits through the overflow 12 from the drum and passes through the annular gap between the drum and housing in the suspension discharge 10. It can then be guided into a suitable memory or recirculated through the pipe 8 back into the dispersing device ,

Wenn die hergestellte Suspension klassiert werden soll, wird sie vom Speicher abgezogen und über das Zuführrohr 8 in den unteren Bereich der Trommel in Richtung auf die Trommelwand im Durchlaufverfahren geführt. In der Klassierphase wird die Drehzahl der Trommel 2 auf Klassierdrehzahl eingestellt. Die ausgeklappten Dispergierflügel 11 werden nach innen gegen die Außenwand des Pulverschachtes 6 geklappt. Die Trommel rotiert mit der entsprechenden Klassierdrehzahl, wodurch grobe Partikel der zu klassierenden Suspension nach außen gegen die Trommelinnenwand in die dort angeordneten Kammern 3 geschleudert werden. In den Kammern bildet sich ein fester Kuchen aus, der mit fortschreitendem Klassiervorgang immer dicker wird. Die klassierte Suspension wird über das Abführrohr 9 abgezogen. Dieses Abführrohr 9 ist im übrigen schwenkbar ausgebildet, so daß es erst in der Klassierphase in das Gehäuse eingeschwenkt wird.When the prepared suspension is to be classified, it is withdrawn from the storage and passed through the feed tube 8 in the lower portion of the drum in the direction of the drum wall in a continuous process. In the Klassierphase the speed of the drum 2 is set to Klassierdrehzahl. The unfolded dispersing vanes 11 are folded inwardly against the outer wall of the powder chute 6. The drum rotates with the corresponding one Classifying speed, whereby coarse particles of the suspension to be classified are thrown outwards against the inner wall of the drum in the chambers 3 arranged there. In the chambers, a solid cake forms, which gets thicker as the classifying process progresses. The classified suspension is withdrawn via the discharge pipe 9. This discharge pipe 9 is otherwise pivotally formed, so that it is pivoted into the housing only in the Klassierphase.

Auch die klassierte Suspension kann im Kreislauf geführt und über das Rohr 8 erneut in die Trommel eingeführt werden. Wenn eine entsprechende Qualität der klassierten Suspension erreicht ist, wird der Klassiervorgang gestoppt. Der in der Trommel verbleibende Suspensionsrest kann jetzt über eine nicht dargestellte Restentleerung abgezogen werden.The classified suspension can be recycled and introduced via the tube 8 again in the drum. If a corresponding quality of the classified suspension is achieved, the classification process is stopped. The remainder of the suspension remaining in the drum can now be withdrawn via a discharge not shown.

Es beginnt nunmehr die Reinigungsphase der Vorrichtung. Hierzu werden die Dispergierflügel 11, die gleichzeitig als Reinigungsmesser dienen, aufgeklappt, so daß sie in die Kammern 3 hineinreichen. Durch Drehen der Trommel wird der rotierende Kuchen durch die feststehenden Messer gelöst. Die entsprechende Reinigungswirkung kann durch Wasserzufuhr über das Rohr 8 unterstützt werden. Es bildet sich in der Trommel 2 erneut eine Suspension aus Grobanteil und Wasser, die abgeführt werden kann. Der Grobanteil kann gemahlen werden, und die erhaltene Suspension kann wieder in das System eingeführt werden. Nach Beendigung der Reinigungsphase kann erneut mit einer Dispergierphase begonnen werden.It begins now the cleaning phase of the device. For this purpose, the dispersing wings 11, which also serve as a cleaning knife, unfolded, so that they extend into the chambers 3. By turning the drum, the rotating cake is released by the fixed knives. The corresponding cleaning effect can be supported by supplying water through the pipe 8. It forms again in the drum 2, a suspension of coarse fraction and water, which can be removed. The coarse fraction can be ground and the resulting suspension reintroduced into the system. After completion of the cleaning phase can be started again with a dispersion phase.

Die in Figur 2 schematisch im Vertikalschnitt dargestellte Dispergiervorrichtung unterscheidet sich von der der Figur 1 nur in einigen Merkmalen, so daß zur Bezeichnung von gleichen Merkmalen gleiche Bezugszeichen wie in Figur 1 verwendet wurden.The dispersing device illustrated schematically in vertical section in FIG. 2 differs from that of FIG. 1 only in a few features, so that the same reference numbers as in FIG. 1 are used to designate the same features were used.

Die Dispergiervorrichtung umfaßt ebenfalls ein stationäres Gehäuse 1 mit einer darin vertikal angeordneten Trommel 2, die über eine Welle 7 gedreht wird. Eine Feststoffzuführeinrichtung ist in der Form eines Rohres 17 ausgebildet, daß sich durch die Oberseite des Gehäuses 1 bis in den unteren Bereich der Trommel 2 hinein erstreckt. Im Rohr ist eine Dosierschnecke 18 angeordnet. Das Rohr 17 geht an seinem oberen Ende in einen Fülltrichter 19 über. Die Dosierschnecke 18 fördert Pulver in die Trommel.The dispersing device also comprises a stationary housing 1 with a vertically arranged drum 2, which is rotated by a shaft 7. A solids supply means is formed in the form of a tube 17 extending through the top of the housing 1 into the lower portion of the drum 2. In the tube a metering screw 18 is arranged. The tube 17 is at its upper end in a hopper 19 over. The metering screw 18 delivers powder into the drum.

Die Flüssigkeitszuführeinrichtung ist in der Form eines Zuführrohres 8 ausgebildet, das sich ebenfalls durch die Oberseite des Gehäuses 1 bis in den unteren Bereich der rotierenden Trommel 2 erstreckt. Im unteren Bereich ist das Rohr 8 schräg nach innen und unten gebogen, wie bei 13 gezeigt. Hierdurch wird die über das Rohr 8 zugeführte Flüssigkeit (Wasser) auf einen Spritzteller 14 geführt, der fest mit der Trommelwelle 7 verbunden ist. Auf diese Weise wird ein Zerstäubungs- bzw. Verwirbelungseffekt in bezug auf die zugeführte Flüssigkeit und den Feststoff erreicht.The liquid supply means is formed in the form of a supply pipe 8 which also extends through the top of the housing 1 to the lower portion of the rotary drum 2. In the lower region, the tube 8 is bent obliquely inwards and downwards, as shown at 13. As a result, the supplied via the pipe 8 liquid (water) is guided on a spray plate 14 which is fixedly connected to the drum shaft 7. In this way, a sputtering effect with respect to the supplied liquid and the solid is achieved.

Bei dieser Ausführungsform ist ein spezielles Dispergierwerkzeug 15 vorgesehen, das in der Form eines Stabes oder mehrerer Stäbe ausgebildet ist, der sich durch die Oberseite des Gehäuses bis in den unteren Bereich der rotierenden Trommel 2 erstreckt. Am Stab sind drei übereinander angeordnete Dispergierflügel 16 vorgesehen, die ein- und ausklappbar sind und in Figur 2 in ihrer ausgeklappten Stellung dargestellt sind.In this embodiment, a special dispersing tool 15 is provided, which is formed in the shape of a rod or rods extending through the top of the housing to the lower portion of the rotating drum 2. Three superimposed dispersing vanes 16 are provided on the rod, which can be folded in and out and are shown in their unfolded position in FIG.

Auch bei dieser Ausführungsform funktionieren die Dispergierflügel 16 als Reinigungsmesser, die in die Kammern 3 eingreifen und den dort abgesetzten Kuchen lösen.In this embodiment, too, the dispersing blades 16 function as cleaning blades, which engage in the chambers 3 and release the cake deposited there.

Als zusätzliche Dispergiervorrichtung dient der Spritzteller 14, der für eine Verwirbelung im zentralen Bereich der Trommel sorgt. Die Funktionsweise der Vorrichtung entspricht im wesentlichen der von Figur 1.As an additional dispersing the spray plate 14, which provides a swirl in the central region of the drum. The mode of operation of the device essentially corresponds to that of FIG. 1.

Die Vorrichtung ist als Batch- oder Inline-Maschine einsetzbar. Der Suspensionsaustrag ist mit und ohne Druck möglich. Der Einzug des Feststoffs (Pulvers) kann mittels erzeugtem Unterdruck (rotierende Trommel) erfolgen, wodurch die Staubbelastung der Umgebung reduziert wird. Bezüglich der Dispergierwirkung ist eine stufenlose Einflußnahme möglich.The device can be used as a batch or inline machine. The suspension discharge is possible with and without pressure. The collection of the solid (powder) can be done by means of generated negative pressure (rotating drum), whereby the dust load of the environment is reduced. With regard to the dispersing effect, infinite influence is possible.

Claims (12)

  1. A dispersing device comprising a housing (1), a rotating drum (2) disposed within the housing (1) and having a vertical axis and a drum driving shaft (7), a solid feed means (4, 5, 6; 17, 18, 19) extending into the drum (2), a liquid feed means (8) extending into the drum (2), a suspension discharge means (10) and a dispersing tool with at least one radially extending dispersing member wherein the dispersing member is formed by a radially outwardly extending dispersing vane (11, 16) and the dispersing tool is formed by at least one of the following components:
    a. the solid feed means (4, 5, 6; 17, 18, 19),
    b. the liquid feed means (8),
    c. the drum driving shaft (7),
    d. a separate dispersing tool (15) extending into the drum (2),
    characterized in that the drum (2) which is open at the top forms an overflow (12) for the generated suspension and that the annular space formed between the drum (2) and the housing (1) takes up the suspension discharged from the drum (2) over the overflow (12) and feeds the same to the suspension discharge means (10).
  2. The dispersing device according to claim 1, characterized in that the dispersing tool is rotatable.
  3. The dispersing device according to claim 1 or 2, characterized in that the inner wall of the drum (2) is provided with chambers (3).
  4. The dispersing device according to one of the preceding claims, characterized in that the solid feed means comprises a shaft (6) or a tube (17).
  5. The dispersing device according to one of the preceding claims, characterized in that the liquid feed means (8) comprises a tube.
  6. The dispersing device according to one of the preceding claims, characterized in that it includes a circulation system for returning the suspension discharged by the suspension discharge means (10) through the liquid feed means (8) into the drum (2).
  7. The dispersing device according to one of the preceding claims, characterized in that the dispersing tool (15) has a plurality of superposed dispersing vanes (11, 16).
  8. The dispersing device according to one of the preceding claims, characterized in that it is simultaneously formed as classifying device and has a discharge means (9) for the classified suspension.
  9. The dispersing device according to one of the preceding claims, characterized in that at least one dispersing vane (11, 16) is formed as cleaning means for the solid deposited at the drum wall.
  10. The dispersing device according to one of the preceding claims, characterized in that the at least one dispersing vane (11, 16) is adapted to be tilted outwardly and inwardly.
  11. The dispersing device according to one of the preceding claims, characterized in that the solid feed means, the liquid feed means and/or the discharge means for the classified suspension are adapted to be moved, especially tilted, into the drum and again out of the same.
  12. The dispersing device according to one of the preceding claims, characterized in that the dispersing tool is movable into the drum in axial and/or radial direction.
EP00106283A 1999-03-27 2000-03-23 Dispersing device Expired - Lifetime EP1043061B1 (en)

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DE19914086A DE19914086A1 (en) 1999-03-27 1999-03-27 Dispersing device comprises a housing, a rotating drum, a solid feed device, a liquid feed device, a suspension removal device and a dispersing tool
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EP0570335B1 (en) * 1992-04-30 1995-08-23 Urs Liechti Device and process for mixing a pulverulent solid component to a liquid material
US5743840A (en) * 1996-06-24 1998-04-28 Carr Separations, Inc. Centrifuge with a heating jacket for drying collected solids

Also Published As

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DE19914086A1 (en) 2000-09-28
EP1043061A1 (en) 2000-10-11
DE50013844D1 (en) 2007-01-25
ATE347929T1 (en) 2007-01-15

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