EP2272591A1 - Stirring ball mill - Google Patents
Stirring ball mill Download PDFInfo
- Publication number
- EP2272591A1 EP2272591A1 EP09164693A EP09164693A EP2272591A1 EP 2272591 A1 EP2272591 A1 EP 2272591A1 EP 09164693 A EP09164693 A EP 09164693A EP 09164693 A EP09164693 A EP 09164693A EP 2272591 A1 EP2272591 A1 EP 2272591A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ball mill
- outlet
- gas outlet
- agitator ball
- outlet channel
- 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.)
- Granted
Links
- 238000003756 stirring Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005187 foaming Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- -1 foodstuffs Substances 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
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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
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
- B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
- B02C17/163—Stirring means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
Definitions
- the invention relates to a stirred ball mill according to the preamble of the independent claim.
- Agitated ball mills are used, for example, for comminuting or dispersing solids in a liquid phase, in particular for products from nanotechnology, but also, for example, for dye suspensions, coating colors, printing inks, agrochemicals, filler suspensions, cosmetics, foodstuffs, pharmaceuticals or microorganisms.
- the material to be ground or dispersed in a liquid is introduced into the grinding chamber through the inlet arranged at one end of a grinding chamber and is ground or dispersed therein.
- the material is thereby successively moved through the grinding chamber, whereupon the ground or dispersed material is passed through a separating member, e.g. can be removed through a dynamic separation gap or through a slotted screen, and then through an outlet arranged at the inlet end.
- a separating member e.g. can be removed through a dynamic separation gap or through a slotted screen
- the material to be ground or to be dispersed is pumped from a container into the agitator ball mill and back into the same container until the desired fineness of the ground or dispersed product (product) is reached.
- the basic operation of such stirred ball mills is known and, for example, in the EP 0 627 262 or the DE 2 215 790 described.
- the agitating ball mill according to the invention for fine grinding or dispersion of a product has a cylindrical or conical grinding chamber for receiving grinding bodies and for receiving the material to be ground or dispersed. It also has an inlet arranged at one end of the grinding chamber for the material to be ground or dispersed, and an agitator with stirrers extending in the axial direction into the grinding chamber for moving the grinding bodies and the material to be ground or dispersed in the grinding chamber , Finally, it has a product outlet arranged at the other end of the grinding chamber for the ground or dispersed material. At the outlet end of the grinding chamber, a gas outlet is arranged in the central region, through which gaseous components, but no grinding bodies out are deductible.
- the present invention is a venting system for removing gaseous components from the grinding chamber.
- the centrifugal force which is generated by the agitator with its stirrers, used to separate the gaseous components, in particular gas bubbles, from a solid suspension.
- the solid suspension and the media are flung outward due to their higher density (as compared to the gas bubbles), while the gas bubbles, e.g. Air bubbles, stay in the central area (approximately in the center).
- This separation effect is basically independent of the type and shape of the stirring elements of the agitator.
- the grinding chamber Due to the gas outlet in the central region of the grinding chamber at the outlet end of the same, the grinding chamber can be "vented" in this way.
- the gas outlet may preferably be provided with a sieve in order to prevent a flow of grinding media.
- the vent may be structurally designed in various ways. While basically a vent hole is sufficient, in one embodiment of the inventive stirred ball mill, the gas outlet comprises a gas outlet channel extending in the axial direction.
- the agitator ball mill according to the invention, the agitator on a shaft on which the stirring elements are fixed, and extending in the axial direction extending gas outlet channel through the Wave through.
- the gas outlet channel extending in the axial direction extends through an end wall which is arranged at the outlet end and delimits the cylindrical or conical grinding chamber.
- the product outlet for the ground or dispersed material is likewise arranged in the central region of the outlet-side end wall, which comprises a product outlet channel extending in the axial direction through the outlet-side end wall.
- the product outlet channel and the gas outlet channel may be formed as separate outlet channels.
- the outlet of the gas outlet channel may open into the product outlet channel prior to the outlet of the product outlet channel.
- a separating element permeable to the ground or dispersed material eg a slotted screen
- the ground or dispersed material is only in the essential radial direction through the separating element can pass through and then into the product outlet or the product outlet.
- the grinding media are thereby retained by the separating member, while the milled or dispersed product with the desired specifications (particle size) can flow through the separating member (eg the slotted screen) towards the product outlet.
- the separating member may be formed as a cylindrical sieve cartridge, wherein the gas outlet passage in the axial direction passes centrally through the interior of the sieve cartridge.
- the cylindrical screen cartridge can be easily replaced or cleaned, should this be necessary.
- the agitator ball mill at the inlet of the gas outlet or the gas outlet channel may be arranged a sieve, which is designed so that it retains at least the grinding media in the grinding chamber.
- the outlet of the gas outlet or the gas outlet channel can be connected to a vacuum tank.
- the product, which is sucked in by the vacuum, can be separated and fed separately back to the inlet of the agitator ball mill.
- the type and shape of the stirring elements on the shaft of the agitator can be optimally chosen according to the purpose.
- the agitator a Have shaft on which are fixedly arranged as agitator paddle wheels, discs or pins.
- Fig. 1 is a section (outlet end) of a first embodiment of the inventive agitator ball mill 1 shown, in which a gas outlet channel 140 out through the outlet-side end wall 100 of the grinding chamber 10 out.
- the separate product outlet or product outlet channel is not shown in this embodiment.
- stirrers 131 are arranged, which are formed as disks.
- Fig. 2 is a section (outlet end) of a second embodiment of the inventive agitator ball mill 1a with an axially extending through the shaft 130a of the agitator 13a gas outlet channel 140a.
- the gas discharge passage 140a is not led out through the discharge side end wall 100a of the grinding chamber 10a, but instead, it is carried out out outwardly in the shaft 130a of the agitator.
- the stirring members 131a are similar to the embodiment according to FIG Fig. 1 , designed as discs.
- Fig. 3 is a section (outlet end) of a third embodiment of the inventive agitator ball mill 1b to recognize, with the grinding chamber 10b and with the shaft 130b of the agitator 13b, on which stirrers 131b are arranged in the form of Schaufelradartigen accelerators.
- the gas outlet channel 140b passes centrally through the interior of a sieve cartridge 150b, but is not led out of the grinding chamber 10b as a separate gas outlet channel 140b, but flows into the product outlet channel 120b in the region of the outlet end wall 100b.
- a kind Venturi effect can be achieved, namely by the gaseous components, such as gas bubbles are entrained by the pumped through the Artsauslasskanal 120b solid suspension.
- Fig. 4 is a section (outlet side end) of a fourth embodiment of the inventive agitator ball mill 1c to recognize, in which in the region of the end of the shaft 130c of the agitator 13c in addition to the blade-like stirrers 131c (accelerators), an additional stirrer 131c on the shaft 130c can be seen.
- the gas discharge passage 140c is separately led out of the grinding chamber 10c through the sieve cartridge 150c and through the outlet side end wall 100c, thus discharging, unlike the embodiment Fig. 3 - not in the product outlet channel 120c.
- Fig. 5 is a schematic representation of a fifth embodiment of the inventive agitator ball mill 1d shown with a vacuum container 2, which is connected to the gas outlet channel 140d of the agitator ball mill 1d.
- the fifth embodiment of the agitator ball mill 1 according to the invention again comprises a cylindrical grinding chamber 10d and an inlet 11 arranged at one end of the grinding chamber 10d for the material to be ground or dispersed, for example a solid suspension. Through the inlet 11, the material to be ground or to be dispersed can be fed to the grinding chamber 10d.
- the grinding chamber 10d are in operation - - typically spherical - grinding media (not shown), which consist for example of a ceramic or other highly abrasion-resistant material.
- the agitator 13d rotatable about the chamber axis as a rotation axis 101d is also arranged, on the shaft 130d of which stirring elements 131d are fixedly arranged.
- the embodiment of the agitator ball mill 1d according to Fig. 5 a product outlet 12 for the ground or dispersed material arranged at the other end (outlet-side end) of the grinding chamber 10d.
- the product outlet 12 comprises a product outlet channel 120d, which extends through the outlet-side end wall 100d of the grinding chamber 10d and here exemplarily has the shape of a pipe section with a curvature.
- a gas outlet 14 is provided in the form of a gas outlet channel 140d, which is arranged at the outlet end of the grinding chamber 10d in the central region and is exemplified here as a separate piece of pipe, which is led out of the grinding chamber 10d separated from the pipe section designed as a product outlet 120d.
- the separation of the ground or dispersed material and the grinding media can also be carried out in other ways, for example with the aid of rotating separation gaps or other suitable methods.
- agitators 131d are again designed as accelerator-type accelerators in order to convey the grinding bodies and the material to be ground or to be dispersed radially to agitator shaft 130d.
- paddle wheel-like agitators 131d acts on the grinding media a centrifugal force, which conveys the grinding media radially outward.
- the outlet of the gas outlet channel 140d which is passed through the outlet-side end wall of the grinding chamber 10d, is here connected to the already mentioned vacuum container 2, which in turn is connected to a vacuum pump 3. So that no grinding media can flow out of the grinding chamber 10d, a sieve can be arranged at the inlet of the gas outlet channel 140d (not shown).
- the vacuum pump 3 generates a negative pressure in the vacuum container 2, whereby the gaseous components are discharged from the grinding chamber 10d through the gas outlet channel 140d extending centrally through the interior of the screen cartridge 150d in the axial direction.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Die Erfindung betrifft eine Rührwerkskugelmühle gemäss dem Oberbegriff des unabhängigen Patentanspruchs.The invention relates to a stirred ball mill according to the preamble of the independent claim.
Rührwerkskugelmühlen werden beispielsweise zur Zerkleinerung bzw. Dispergierung von Feststoffen in einer Flüssigkeitsphase eingesetzt, insbesondere für Produkte aus der Nanotechnologie, aber auch beispielsweise für Farbstoffsuspensionen, Lackfarben, Druckfarben, Agrochemikalien, Füllstoffsuspensionen, Kosmetika, Nahrungsmittel Pharmazeutika oder Mikroorganismen.Agitated ball mills are used, for example, for comminuting or dispersing solids in a liquid phase, in particular for products from nanotechnology, but also, for example, for dye suspensions, coating colors, printing inks, agrochemicals, filler suspensions, cosmetics, foodstuffs, pharmaceuticals or microorganisms.
Dabei wird durch den am einen Ende einer Mahlkammer angeordneten Einlass das zu mahlende oder in einer Flüssigkeit zu dispergierende Gut in die Mahlkammer eingebracht und in dieser gemahlen bzw. dispergiert. Das Gut wird dabei sukzessive durch die Mahlkammer hindurch bewegt, woraufhin das gemahlene bzw. dispergierte Gut durch ein Trennorgan hindurch, z.B. durch einen dynamischen Trennspalt oder durch ein Schlitzsieb,sowie anschliessend durch einen am dem Einlass gegenüberliegenden Ende angeordneten Auslass abgeführt werden kann. Beim Betreib der Rührwerkskugelmühlen wird grundsätzlich unterschieden zwischen der Passagenfahrweise und der Kreislauffahrweise.In this case, the material to be ground or dispersed in a liquid is introduced into the grinding chamber through the inlet arranged at one end of a grinding chamber and is ground or dispersed therein. The material is thereby successively moved through the grinding chamber, whereupon the ground or dispersed material is passed through a separating member, e.g. can be removed through a dynamic separation gap or through a slotted screen, and then through an outlet arranged at the inlet end. When operating the agitator ball mills is basically a distinction between the Passagenfahrweise and the circulation mode.
Bei der Passagenfahrweise wird das zu mahlende bzw. zu dispergierende Gut von einem ersten Behälter durch die Rührwerkskugelmühle hindurch in einen zweiten Behälter gepumpt. Um eine gewünschte Feinheit des gemahlenen bzw. dispergierten Guts (Produkt) zu erreichen, kann ggf. das Gut von dem zweiten Behälter erneut durch die Rührwerkskugelmühle in einen weiteren Behälter gepumpt werden, und so weiter (Mehrpassagenfahrweise).In Passagenfahrweise the material to be ground or to be dispersed is pumped from a first container through the agitator ball mill into a second container. In order to achieve a desired fineness of the ground or dispersed Guts (product), if necessary, the good be pumped from the second container again by the agitator ball mill in another container, and so on (multi-pass mode).
Bei der Kreislauffahrweise wird das zu mahlende bzw. zu dispergierende Gut aus einem Behälter in die Rührwerkskugelmühle und wieder zurück in denselben Behälter gepumpt, bis die gewünschte Feinheit des gemahlenen bzw. diespergierten Guts (Produkt) erreicht ist. Die grundsätzliche Funktionsweise solcher Rührwerkskugelmühlen ist bekannt und beispielsweise in der
Bei Rührwerkskugelmühlen kommen verschiedene Trenntechniken zum Einsatz, um das gemahlene bzw. dispergierte Gut (Produkt) von den Mahlkörpern zu trennen. Beispiele hierfür sind dynamische Trennspalte, die aus einem Rotor und einem Stator bestehen, und Siebe, z.B. Schlitzsiebe. Aufgrund der höheren Durchgangsfläche ist mit Sieben im Allgemeinen ein höherer Durchsatz realisierbar. Allerdings kann der Durchgang durch die Schlitze der Schlitzsiebe unter anderem durch Gasblasen behindert werden, wenn das zu mahlende Gut nicht vor dem Eintritt in die Mahlkammer entgast wird. Ausserdem steht der Raum, der die Gasblasen enthält, nicht für die Mahlung bzw. Dispergierung zur Verfügung, und Gasblasen können zur Krustenbildung und zur Verklebung der Mahlkörper und/oder des zu mahlenden bzw. zu dispergierenden Guts führen. Dies hat eine Reduktion der Mahlleistung zur Folge und kann im Extremfall zu einer Blockierung der Rührwerkskugelmühle führen. Beim Auftreten von Gasblasen im Gut werden die Blasen durch Turbulenzen und Mahlkörper weiter zerkleinert, was auch zum Schäumen und damit zu einer noch stärkeren Blockierung des Siebs führen kann. Der Druck in der Mahlkammer kann dabei ganz erheblich zunehmen und so hoch werden, dass im Extremfall der Betrieb der Rührwerkskugelmühle unterbrochen werden muss.In stirred ball mills, different separation techniques are used to separate the ground or dispersed product from the grinding media. Examples include dynamic separation gaps, which consist of a rotor and a stator, and screens, such as slot screens. Due to the higher throughput area, a higher throughput is generally achievable with screens. However, the passage through the slots of the slot sieves can be hindered inter alia by gas bubbles, if the material to be ground is not degassed before entering the grinding chamber. In addition, the space containing the gas bubbles is not available for grinding or dispersion, and gas bubbles can lead to crusting and sticking of the grinding media and / or the material to be ground or dispersed. This results in a reduction of grinding performance and, in extreme cases, can lead to a blockage of the agitator ball mill. When gas bubbles occur in the material, the bubbles are further comminuted by turbulence and grinding media, which also foams and This can lead to an even stronger blockage of the screen. The pressure in the grinding chamber can thereby increase considerably and become so high that in extreme cases the operation of the stirred ball mill must be interrupted.
Es ist daher eine Aufgabe der Erfindung, eine Rührwerkskugelmühle der genannten Art dahingehend zu verbessern, dass die vorstehend genannten Probleme nicht mehr auftreten oder zumindest stark reduziert werden.It is therefore an object of the invention to improve a stirred ball mill of the type mentioned in that the aforementioned problems no longer occur or at least greatly reduced.
Diese Aufgabe wird erfindungsgemäss durch eine Rührwerkskugelmühle gelöst, wie sie durch die Merkmale des unabhängigen Patentanspruchs charakterisiert ist. Vorteilhafte Ausführungsbeispiele der erfindungsgemässen Rührwerkskugelmühle sind Gegenstand der abhängigen Patentansprüche.This object is achieved according to the invention by a stirred ball mill, as characterized by the features of the independent patent claim. Advantageous embodiments of the inventive agitator ball mill are the subject of the dependent claims.
Insbesondere weist die erfindungsgemässe Rührwerkskugelmühle zum Feinmahlen oder Dispergieren eines Guts eine zylindrische oder konische Mahlkammer zur Aufnahme von Mahlkörpern auf sowie zur Aufnahme des zu mahlenden bzw. zu dispergierenden Guts. Sie weist ferner einen an einem Ende der Mahlkammer angeordneten Einlass für das zu mahlende oder zu dispergierende Gut auf, sowie ein sich in axialer Richtung in die Mahlkammer erstreckendes Rührwerk mit Rührorganen zum Bewegen der Mahlkörper und des zu mahlenden bzw. zu dispergierenden Guts in der Mahlkammer. Schliesslich weist sie einen am anderen Ende der Mahlkammer angeordneten Produktauslass auf für das gemahlene bzw. dispergierte Gut. Am auslassseitigen Ende der Mahlkammer ist im zentralen Bereich ein Gasauslass angeordnet, durch welchen hindurch gasförmige Komponenten, jedoch keine Mahlkörper heraus abführbar sind.In particular, the agitating ball mill according to the invention for fine grinding or dispersion of a product has a cylindrical or conical grinding chamber for receiving grinding bodies and for receiving the material to be ground or dispersed. It also has an inlet arranged at one end of the grinding chamber for the material to be ground or dispersed, and an agitator with stirrers extending in the axial direction into the grinding chamber for moving the grinding bodies and the material to be ground or dispersed in the grinding chamber , Finally, it has a product outlet arranged at the other end of the grinding chamber for the ground or dispersed material. At the outlet end of the grinding chamber, a gas outlet is arranged in the central region, through which gaseous components, but no grinding bodies out are deductible.
Somit geht es bei der vorliegenden Erfindung um ein Entlüftungssystem zur Entfernung gasförmiger Komponenten aus der Mahlkammer. Dabei wird die Zentrifugalkraft, die vom Rührwerk mit seinen Rührorganen erzeugt wird, genutzt, um die gasförmigen Komponenten, insbesondere Gasblasen, von einer Feststoffsuspension zu trennen. Im Zentrifugalkraftfeld werden die Feststoffsuspension und die Mahlkörper aufgrund ihrer höheren Dichte (im Vergleich zu den Gasblasen) nach aussen geschleudert, während die Gasblasen, z.B. Luftblasen, im zentralen Bereich (etwa im Zentrum) bleiben. Diese Trennwirkung ist grundsätzlich unabhängig von der Art und der Form der Rührorgane des Rührwerks. Durch den Gasauslass im zentralen Bereich der Mahlkammer am auslassseitigen Ende derselben kann auf diese Weise die Mahlkammer "entlüftet" werden. Je nach Gestaltung dieses Gasauslasses kann vorzugsweise der Gasauslass mit einem Sieb versehen werden, um ein Ausströmen von Mahlkörpern zu verhindern.Thus, the present invention is a venting system for removing gaseous components from the grinding chamber. In this case, the centrifugal force, which is generated by the agitator with its stirrers, used to separate the gaseous components, in particular gas bubbles, from a solid suspension. In the centrifugal force field, the solid suspension and the media are flung outward due to their higher density (as compared to the gas bubbles), while the gas bubbles, e.g. Air bubbles, stay in the central area (approximately in the center). This separation effect is basically independent of the type and shape of the stirring elements of the agitator. Due to the gas outlet in the central region of the grinding chamber at the outlet end of the same, the grinding chamber can be "vented" in this way. Depending on the design of this gas outlet, the gas outlet may preferably be provided with a sieve in order to prevent a flow of grinding media.
Die Entlüftung kann konstruktiv auf verschiedene Art und Weise ausgebildet sein. Während grundsätzlich eine Entlüftungsbohrung ausreichend ist, umfasst bei einem Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle der Gasauslass einen sich in axialer Richtung erstreckenden Gasauslasskanal.The vent may be structurally designed in various ways. While basically a vent hole is sufficient, in one embodiment of the inventive stirred ball mill, the gas outlet comprises a gas outlet channel extending in the axial direction.
Hierbei sind mehrere Varianten denkbar. So weist bei einem Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle das Rührwerk eine Welle auf, auf welcher die Rührorgane fest angeordnet sind, und der sich in axialer Richtung erstreckende Gasauslasskanal verläuft durch die Welle hindurch.Here are several variants conceivable. Thus, in one embodiment of the agitator ball mill according to the invention, the agitator on a shaft on which the stirring elements are fixed, and extending in the axial direction extending gas outlet channel through the Wave through.
Bei einem weiteren Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle erstreckt sich der sich in axialer Richtung erstreckende Gasauslasskanal durch eine am auslassseitigen Ende angeordnete, die zylindrische oder konische Mahlkammer begrenzende Abschlusswand hindurch. Diese Variante ist konstruktiv einfach und ermöglicht mehrere weitere Ausführungsvarianten, wie im Folgenden noch erläutert wird.In a further embodiment of the agitator ball mill according to the invention, the gas outlet channel extending in the axial direction extends through an end wall which is arranged at the outlet end and delimits the cylindrical or conical grinding chamber. This variant is structurally simple and allows several further variants, as will be explained below.
So ist bei einem weitern Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle der Produktauslass für das gemahlene bzw. dispergierte Gut ebenfalls im zentralen Bereich der auslassseitigen Abschlusswand angeordnet, welcher einen sich in axialer Richtung durch die auslassseitige Abschlusswand erstreckenden Produktauslasskanal umfasst. Dabei können der Produktauslasskanal und der Gasauslasskanal als voneinander getrennte Auslasskanäle ausgebildet sein. Alternativ kann der Ausgang des Gasauslasskanals vor dem Ausgang des Produktauslasskanals in den Produktauslasskanal einmünden. Dadurch kann eine Art Venturi-Effekt erzielt werden, indem die Luft vom ausströmenden Produkt mitgerissen werden kann.Thus, in a further exemplary embodiment of the agitator ball mill according to the invention, the product outlet for the ground or dispersed material is likewise arranged in the central region of the outlet-side end wall, which comprises a product outlet channel extending in the axial direction through the outlet-side end wall. In this case, the product outlet channel and the gas outlet channel may be formed as separate outlet channels. Alternatively, the outlet of the gas outlet channel may open into the product outlet channel prior to the outlet of the product outlet channel. As a result, a kind of Venturi effect can be achieved, in that the air can be entrained by the outflowing product.
Bei einem weiteren Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle ist ein für das gemahlene bzw. dispergierte Gut, jedoch nicht für die Mahlkörper durchlässiges Trennorgan (z.B. ein Schlitzsieb) vor dem Produktauslass bzw. vor dem Produktauslasskanal derart angeordnet, dass das gemahlene bzw. dispergierte Gut nur in im wesentlichen radialer Richtung durch das Trennorgan hindurch und anschliessend in den Produktauslass bzw. den Produktauslasskanal gelangen kann. So kann das gemahlene bzw. dispergierte Produkt, welches durch die Zentrifugalkraft radial nach aussen gedrängt wurde, in radialer Richtung durch das Trennorgan zurück in Richtung des zentral in der auslassseitigen Abschlusswand angeordneten Produktauslasses strömen. Die Mahlkörper werden dabei von dem Trennorgan zurückgehalten, während das gemahlene bzw. dispergierte Produkt mit den gewünschten Spezifikationen (Teilchengrösse) das Trennorgan (z.B. das Schlitzsieb) zum Produktauslass hin durchströmen kann. Das Trennorgan kann dabei als zylindrische Siebpatrone ausgebildet sein, wobei der Gasauslasskanal in axialer Richtung zentral durch den Innenraum der Siebpatrone hindurch verläuft. Die zylindrische Siebpatrone kann auf einfache Weise ausgetauscht bzw. gereinigt werden, sollte dies erforderlich sein.In a further embodiment of the agitator ball mill according to the invention, a separating element permeable to the ground or dispersed material (eg a slotted screen) is arranged in front of the product outlet or in front of the product outlet channel such that the ground or dispersed material is only in the essential radial direction through the separating element can pass through and then into the product outlet or the product outlet. Thus, the ground or dispersed product, which has been urged radially outwards by the centrifugal force, can flow in the radial direction through the separating member back in the direction of the product outlet arranged centrally in the outlet-side end wall. The grinding media are thereby retained by the separating member, while the milled or dispersed product with the desired specifications (particle size) can flow through the separating member (eg the slotted screen) towards the product outlet. The separating member may be formed as a cylindrical sieve cartridge, wherein the gas outlet passage in the axial direction passes centrally through the interior of the sieve cartridge. The cylindrical screen cartridge can be easily replaced or cleaned, should this be necessary.
Wie eingangs bereits erwähnt, kann bei einem Ausführungsbeispiel der Rührwerkskugelmühle am Eintritt des Gasauslasses bzw. des Gasauslasskanals ein Sieb angeordnet sein, welches so ausgebildet ist, dass es zumindest die Mahlkörper in der Mahlkammer zurückhält.As already mentioned, in one embodiment of the agitator ball mill at the inlet of the gas outlet or the gas outlet channel may be arranged a sieve, which is designed so that it retains at least the grinding media in the grinding chamber.
Zur Verstärkung der Entlüftung kann der Ausgang des Gasauslasses bzw. des Gasauslasskanals an einen Vakuumbehälter angeschlossen sein. Das Produkt, das vom Vakuum mit angesaugt wird, kann abgetrennt werden und separat zurück zum Einlass der Rührwerkskugelmühle geführt werden.To enhance the vent, the outlet of the gas outlet or the gas outlet channel can be connected to a vacuum tank. The product, which is sucked in by the vacuum, can be separated and fed separately back to the inlet of the agitator ball mill.
Wie bereits erwähnt, kann die Art und die Form der Rührorgane auf der Welle des Rührwerks dem Zweck entsprechend optimal gewählt werden. Insbesondere kann das Rührwerk eine Welle aufweisen, auf der als Rührorgane Schaufelräder, Scheiben oder Stifte fest angeordnet sind.As already mentioned, the type and shape of the stirring elements on the shaft of the agitator can be optimally chosen according to the purpose. In particular, the agitator a Have shaft on which are fixedly arranged as agitator paddle wheels, discs or pins.
Weitere vorteilhafte Aspekte der erfindungsgemässen Rührwerkskugelmühle ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen mit Hilfe der Zeichnung. Es zeigen in schematischer Darstellung:
- Fig. 1
- einen Ausschnitt aus einem ersten Ausführungs- beispiel einer erfindungsgemässen Rührwerks- kugelmühle,
- Fig. 2
- einen Ausschnitt aus einem zweiten Ausführungsbeispiel einer erfindungsgemässen Rührwerkskugelmühle,
- Fig. 3
- einen Ausschnitt aus einem dritten Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle,
- Fig. 4
- einen Ausschnitt aus einem vierten Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühle, und
- Fig. 5
- ein fünftes Ausführungsbeispiel der erfindungsgemässen Rührwerkskugelmühlemit einem mit dem Gasauslasskanal verbundenen Vakuumbehälter.
- Fig. 1
- 1 a detail of a first embodiment of an agitator ball mill according to the invention,
- Fig. 2
- a section of a second embodiment of an inventive agitator ball mill,
- Fig. 3
- a section of a third embodiment of the inventive agitator ball mill,
- Fig. 4
- a section of a fourth embodiment of the inventive agitator ball mill, and
- Fig. 5
- a fifth embodiment of the invention Rührwerks ball mill with a connected to the gas outlet duct vacuum container.
In
In
In
In
In
Weiterhin weist das Ausführungsbeispiel der Rührwerkskugelmühle 1d gemäss
Weiterhin erkennt man in
In dem in
Wie bereits eingangs erwähnt, kann es beim Auftreten von Gasblasen im Gut zu den dort genannten Problemen (Krustenbildung und Verklebung der Mahlkörper und/oder des zu mahlenden bzw. zu dispergierenden Guts, Reduktion der Mahlleistung, eventuelle Blockierung der Rührwerkskugelmühle, noch stärkeres Schäumen, Siebblockade, Anstieg der Drucks in der Mahlkammer, eventuelle Unterbrechung des Betriebs) kommen. Da die Dichte der Feststoffsuspension grösser ist als die Dichte allfälliger gasförmiger Komponenten, z.B. Gasblasen, sammeln sich die Gasblasen im zentralen Bereich der Mahlkammer 10d. Diese können nun durch den am auslassseitigen Ende ebenfalls im zentralen Bereich (also im Bereich der Mitte) angeordneten Gasauslasskanal 140d nach aussen abgeführt werden, sodass ein Schäumen entweder vermieden oder jedenfalls stark reduziert werden kann.As already mentioned, it can occur when gas bubbles occur in good to the problems mentioned there (crusting and bonding of the grinding media and / or to be ground or to be dispersed Guts, reduction of grinding performance, eventual blockage of the stirred ball mill, even stronger foaming, screen block , Increase in pressure in the grinding chamber, eventual interruption of operation). Since the density of the solid suspension is greater than the density of any gaseous components, e.g. Gas bubbles, the gas bubbles accumulate in the central region of the grinding
Der Ausgang des durch die auslassseitige Abschlusswand der Mahlkammer 10d durchgeführten Gasauslasskanals 140d ist hier an den bereits weiter oben erwähnten Vakuumbehälter 2 angeschlossen, der seinerseits an eine Vakuumpumpe 3 angeschlossen ist. Damit keine Mahlkörper aus der Mahlkammer 10d mit ausströmen können, kann am Eingang des Gasauslasskanals 140d ein Sieb angeordnet sein (nicht dargestellt). Die Vakuumpumpe 3 erzeugt im Vakuumbehälter 2 einen Unterdruck, wodurch durch den in axialer Richtung zentral durch den Innenraum der Siebpatrone 150d verlaufenden Gasauslasskanal 140d die gasförmigen Komponenten aus der Mahlkammer 10d abgeführt werden. Falls geringe Mengen der Feststoffsuspension durch den Unterdruck aus der Mahlkammer mit abgesaugt werden, können diese in dem Vakuumbehälter 2 abgetrennt werden und anschliessend mit Hilfe der Förderpumpe 4 dem gemahlenen bzw. dispergierten Gut zugeführt werden, welches entweder abgeführt oder ggf. über den Einlass 11 wieder in die Mahlkammer 10d (oder zu einem Ansatzbehälter) zurückgeführt werden kann.The outlet of the
Die Erfindung ist anhand der vorstehenden Ausführungsbeispiele der Rührwerkskugelmühle beschrieben worden. Die Erfindung ist jedoch nicht derart zu verstehen, als sei sie auf diese Ausführungsbeispiele beschränkt. Vielmehr sind zahlreiche Änderungen und Varianten einer solchen Rührwerkskugelmühle vorstellbar, ohne dabei von der technischen Lehre der Erfindung abzuweichen. Nur als Beispiel soll erwähnt werden, dass grundsätzlich der Gasauslass auch als Auslass-öffnung ausgebildet sein kann und nicht notwendigerweise einen Kanal umfassen muss, auch wenn die beschriebenen Ausführungsbeispiele alle einen solchen Gasauslasskanal aufweisen. Der Schutzbereich wird somit durch die folgenden Ansprüche definiert.The invention has been described with reference to the above embodiments of the agitator ball mill. However, the invention is not to be understood as being limited to these embodiments. Rather, numerous changes and variants of such a stirred ball mill are conceivable without departing from the technical teaching of the invention. By way of example only, it should be mentioned that in principle the gas outlet can also be designed as an outlet opening and does not necessarily have to include a channel, even if the exemplary embodiments described all have such a gas outlet channel. The scope of protection is thus defined by the following claims.
Claims (13)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES09164693T ES2432617T3 (en) | 2009-07-06 | 2009-07-06 | Ball mill with stirrer |
DK09164693.5T DK2272591T3 (en) | 2009-07-06 | 2009-07-06 | Ball mill with stirrer |
EP09164693.5A EP2272591B1 (en) | 2009-07-06 | 2009-07-06 | Stirring ball mill |
PL09164693T PL2272591T3 (en) | 2009-07-06 | 2009-07-06 | Stirring ball mill |
US12/828,173 US8118247B2 (en) | 2009-07-06 | 2010-06-30 | Agitator ball mill |
KR1020100064635A KR101667820B1 (en) | 2009-07-06 | 2010-07-06 | Agitator ball mill |
JP2010154211A JP5763307B2 (en) | 2009-07-06 | 2010-07-06 | Stirring ball mill |
CN2010102186416A CN101890388B (en) | 2009-07-06 | 2010-07-06 | Stirring ball mill |
Applications Claiming Priority (1)
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EP09164693.5A EP2272591B1 (en) | 2009-07-06 | 2009-07-06 | Stirring ball mill |
Publications (2)
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EP2272591A1 true EP2272591A1 (en) | 2011-01-12 |
EP2272591B1 EP2272591B1 (en) | 2013-09-11 |
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EP09164693.5A Active EP2272591B1 (en) | 2009-07-06 | 2009-07-06 | Stirring ball mill |
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US (1) | US8118247B2 (en) |
EP (1) | EP2272591B1 (en) |
JP (1) | JP5763307B2 (en) |
KR (1) | KR101667820B1 (en) |
CN (1) | CN101890388B (en) |
DK (1) | DK2272591T3 (en) |
ES (1) | ES2432617T3 (en) |
PL (1) | PL2272591T3 (en) |
Cited By (1)
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EP2905080A1 (en) | 2014-02-07 | 2015-08-12 | Willy A. Bachofen AG | Agitator ball mill |
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DE102012013279A1 (en) * | 2012-07-05 | 2014-01-09 | Roland Nied | Method for operating a stirred ball mill and agitator ball mill therefor |
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CN104056694B (en) * | 2014-06-20 | 2016-08-24 | 重庆环德科技有限公司 | One can realize accurate scattered sand mill |
CN104959196A (en) * | 2015-06-29 | 2015-10-07 | 广州派勒机械设备有限公司 | Super sand mill with double-separation system |
KR101617862B1 (en) * | 2015-07-31 | 2016-05-03 | 주식회사 우리종합기술 | Sludge Drying System |
KR101616276B1 (en) * | 2015-07-31 | 2016-04-28 | 주식회사 우리종합기술 | Sewage sludge treament complex solubilizing system |
PL3311922T3 (en) * | 2016-10-18 | 2019-05-31 | Bachofen Willy A Ag | Agitator ball mill |
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Also Published As
Publication number | Publication date |
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KR20110004313A (en) | 2011-01-13 |
DK2272591T3 (en) | 2013-12-16 |
EP2272591B1 (en) | 2013-09-11 |
CN101890388A (en) | 2010-11-24 |
ES2432617T3 (en) | 2013-12-04 |
CN101890388B (en) | 2013-02-13 |
US20110000993A1 (en) | 2011-01-06 |
KR101667820B1 (en) | 2016-10-28 |
JP2011016128A (en) | 2011-01-27 |
US8118247B2 (en) | 2012-02-21 |
JP5763307B2 (en) | 2015-08-12 |
PL2272591T3 (en) | 2014-02-28 |
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