EP0446744A1 - Dispersion process and agitator mill for carrying out the process - Google Patents

Dispersion process and agitator mill for carrying out the process Download PDF

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Publication number
EP0446744A1
EP0446744A1 EP91103182A EP91103182A EP0446744A1 EP 0446744 A1 EP0446744 A1 EP 0446744A1 EP 91103182 A EP91103182 A EP 91103182A EP 91103182 A EP91103182 A EP 91103182A EP 0446744 A1 EP0446744 A1 EP 0446744A1
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EP
European Patent Office
Prior art keywords
grinding
grinding media
container
agitator mill
rotors
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.)
Withdrawn
Application number
EP91103182A
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German (de)
French (fr)
Inventor
Reinhard Dr. Polke
Reinhold Dr. Stadler
Klaus Dr. Warnke
Karl Sollik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
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BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP0446744A1 publication Critical patent/EP0446744A1/en
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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

Definitions

  • the invention relates to a method according to the preamble of claim 1 and an agitator mill for performing the method.
  • Dispersion processes and agitator mills are known and are shown, for example, in E-PS O 214 145.
  • the object is achieved in that the material to be ground is introduced axially into the space essentially free of grinding bodies and is deflected by a dust disk to the inner wall of the grinding container of the agitator mill, predominantly causing a radial flow through the grinding container.
  • the invention also relates to an agitator mill for carrying out the dispersion process.
  • the structure of the agitator mill is shown in simplified form in the drawing and is described in more detail below.
  • the drawing shows a longitudinal section through the agitator mill.
  • the drawing shows a grinding container 1, in which rotors 2 designed as paddles are arranged.
  • the grinding stock is fed in at 3, the grinding stock / grinding media are separated on the sieve 4 and the grinding stock flows out at 5.
  • the rotors are driven by the shaft 6.
  • the grinding stock is circulated via the container 7 and the pump 8 Granular bed is represented by 9.
  • the material to be ground is deflected in the radial direction after entry into the grinding container by the circular baffle plate 10.
  • Discs, pins, rods or splitting cylinders arranged parallel to the axis can also be used as rotors.
  • the product can be introduced into the grinding container on both sides, since the flow is radial.
  • the ratio of the diameter of the grinding container to the length of the grinding container is 0.3 ⁇ D / L ⁇ 2.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

Dispersion process in which a material for grinding, consisting of solids and a liquid phase, is introduced and then conveyed in an agitator mill (1) containing grinding bodies, in said mill energy is fed by means of rotating rotors (2) to the material for grinding and the solids are comminuted and wetted with the liquid phase, the rotors (2) rotating at such a high speed that the grinding bodies moved by them form, as a result of the centrifugal force, a rotating grinding body ballast (9) being applied against the inner wall of the mill container of the agitator mill, a space which is essentially free of grinding bodies being produced in the centre of this grinding body ballast (9) and the grinding body ballast flowing through radially from the outside to the inside counter to the centrifugal action in such a way that a centrifugal fluidised bed is produced with respect to the grinding bodies and then the material for grinding is led out of the grinding body-free space by a grinding body separating device (4), the material for grinding being introduced axially into the space which is essentially free of grinding bodies and being deflected by a baffle plate (10) towards the inner wall of the grinding container of the agitator mill, a radial flow through the grinding container being predominantly brought about. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1 und eine Rührwerksmühle zur Durchführung des Verfahrens.The invention relates to a method according to the preamble of claim 1 and an agitator mill for performing the method.

Dispergierverfahren und Rührwerksmühlen sind bekannt und beispielsweise in der E-PS O 214 145 aufgezeigt.Dispersion processes and agitator mills are known and are shown, for example, in E-PS O 214 145.

Bei der aufgezeigten Rührwerksmühle mit radialem Produkteinlaß treten jedoch im Bereich des Produkteinlasses deutliche Verschleißspuren an dem Innenmantel des Mahlbehälters der Rührwerksmühle auf. Die Ursache hierfür könnte darin liegen, daß die Mahlkörper durch den radialen Produktstrom von dem Innenmantel abgelenkt werden um danach wieder anzuprallen, was zu starken Erosionsproblemen führt.In the agitator mill shown with a radial product inlet, however, there are clear signs of wear in the area of the product inlet on the inner jacket of the grinding container of the agitator mill. The reason for this could be that the grinding media are deflected by the radial product flow from the inner jacket and then impact again, which leads to severe erosion problems.

Es stellte sich daher die Aufgabe, diesen Verschleiß zu minimieren bzw. nach Möglichkeit zu verhindern.The task was therefore to minimize this wear and prevent it if possible.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Mahlgut in den von Mahlkörpern im wesentlichen freien Raum axial eingeführt und durch eine Staubscheibe zur Innenwandung des Mahlbehälters der Rührwerksmühle umgelenkt wird, wobei überwiegend eine radiale Durchströmung des Mahlbehälters bewirkt wird.The object is achieved in that the material to be ground is introduced axially into the space essentially free of grinding bodies and is deflected by a dust disk to the inner wall of the grinding container of the agitator mill, predominantly causing a radial flow through the grinding container.

Weitere Merkmale der Erfindung sind Gegenstand der Unteransprüche.Further features of the invention are the subject of the dependent claims.

Überraschenderweise wurde gefunden, daß durch diese Maßnahme die Verschleißspuren am Innenmantel deutlich verringert werden.Surprisingly, it was found that the wear marks on the inner jacket are significantly reduced by this measure.

Der Einfluß des ProdukteintragesThe influence of the product entry

radial -
gemäß der Rühwerksmühle nach der E-PS 0214145 und,
axial -
gemäß der vorliegenden Erfindung

wurde an verschiedenen Produkten getestet.
radial -
according to the agitator mill according to E-PS 0214145 and,
axial -
according to the present invention

has been tested on various products.

Hierbei ergaben sich keine Unterschiede in der Qualität des Mahlgutes, so daß der axiale Produkteintritt eindeutig Vorteile aufweist.There were no differences in the quality of the ground material, so that the axial entry of the product clearly has advantages.

Es wurden Versuche mit 50 µm bis 2,5 mm kleinen Glasmahlkörpern in einer Rührwerksmühle durchgeführt, wobei die Mahlbehälterabmessungen folgende Maße aufwiesen: Durchmesser 240 mm, Länge 300 mm. Bei Umfangsgeschwindigkeiten von ca. 24 m/s wurde mit einer Füllmenge von 12,2 kg (ca. 90 % des Volumens außerhalb des Rotorinnendurchmessers) eine Leistung von 12,5 kW in das Mahlgut eingetragen. Bei 200 - 300 µm kleinen Mahlkörpern sind Durchsätze bis 3000 kg/h möglich. Die Zurückhaltung der Mahlkörper erfolgte einerseits mit einem mitrotierenden Spaltrohrsieb, Produktaustrag über eine Hohlwelle, und andererseits mit einem an einer Bodenplatte feststehenden Sieb. Beim zweiten Fall gilt, der Produktaustrag erfolgt über den Deckel. Die Versuche wurden mit einer hochviskosen (Bingham-artigen) Suspension - Durchsätze ca. 350 kg/h -durchgeführt.Experiments were carried out with glass grinding bodies measuring 50 μm to 2.5 mm in an agitator mill, the grinding container dimensions having the following dimensions: diameter 240 mm, length 300 mm. At a peripheral speed of approx. 24 m / s, a capacity of 12.5 kW was entered into the regrind with a filling quantity of 12.2 kg (approx. 90% of the volume outside the inner diameter of the rotor). Throughputs of up to 3000 kg / h are possible with 200 - 300 µm small grinding media. The grinding media were held back on the one hand with a rotating canned sieve, product discharge via a hollow shaft, and on the other hand with a sieve fixed to a base plate. In the second case, the product is discharged through the lid. The tests were carried out with a highly viscous (Bingham-like) suspension - throughputs approx. 350 kg / h.

Die Erfindung betrifft auch eine Rührwerksmühle zur Durchführung des Dispergierverfahrens.The invention also relates to an agitator mill for carrying out the dispersion process.

Der Aufbau der Rührwerksmühle ist vereinfacht in der Zeichnung dargestellt und wird im folgenden näher beschrieben.The structure of the agitator mill is shown in simplified form in the drawing and is described in more detail below.

Die Zeichnung zeigt einen Längsschnitt durch die Rührwerksmühle.The drawing shows a longitudinal section through the agitator mill.

Die Zeichnung zeigt einen Mahlbehälter 1, in dem als Paddel ausgebildete Rotoren 2 angeordnet sind. Der Zulauf des Mahlgutes erfolgt bei 3, die Trennung Mahlgut/Mahlkörper an dem Sieb 4 und der Abfluß des Mahlgutes bei 5. Der Antrieb der Rotoren erfolgt über die Welle 6. Der Kreislauf des Mahlgutes erfolgt über den Behälter 7 und die Pumpe 8. Die Mahlkörperschüttung ist durch 9 dargestellt. Die Umlenkung des Mahlgutes in radiale Richtung nach dem Eintritt in den Mahlbehälter erfolgt durch die kreisringförmige Stauscheibe 10. Als Rotoren können auch Scheiben, Stifte, parallel zur Achse angeordnete Stäbe oder Spaltzylinder verwendet werden.The drawing shows a grinding container 1, in which rotors 2 designed as paddles are arranged. The grinding stock is fed in at 3, the grinding stock / grinding media are separated on the sieve 4 and the grinding stock flows out at 5. The rotors are driven by the shaft 6. The grinding stock is circulated via the container 7 and the pump 8 Granular bed is represented by 9. The material to be ground is deflected in the radial direction after entry into the grinding container by the circular baffle plate 10. Discs, pins, rods or splitting cylinders arranged parallel to the axis can also be used as rotors.

Der Produkteintrag kann beidseitig in den Mahlbehälter erfolgen, da die Durchströmung radial erfolgt.The product can be introduced into the grinding container on both sides, since the flow is radial.

Das Verhältnis Durchmesser des Mahlbehälters zu Mahlbehälterlänge beträgt 0,3 < D/L < 2.The ratio of the diameter of the grinding container to the length of the grinding container is 0.3 <D / L <2.

Claims (3)

Dispergierverfahren, bei dem ein aus Feststoffen und einer flüssigen Phase bestehendes Mahlgut in eine Mahlkörper enthaltende Rührwerksmühle eingeführt und dann gefördert wird, in dieser durch drehende Rotoren dem Mahlgut Energie zugeführt wird und die Feststoffe zerteilt und mit der flüssigen Phase benetzt werden, wobei die Rotoren sich mit einer so großen Geschwindigkeit drehen, daß die von diesen bewegten Mahlkörper durch die Zentrifugalkraft eine der Innenwandung des Mahlbehälters der Rührwerksmühle anliegende rotierende Mahlkörperschüttung ausbilden, wobei im Zentrum dieser Mahlkörperschüttung ein von Mahlkörper im wesentlichen freier Raum entsteht und wobei die Mahlkörperschüttung entgegen der Zentrifugalwirkung radial von außen nach innen so durchströmt, daß in bezug auf die Mahlkörper ein Zentrifugalwirbelbett entsteht und dann das Mahlgut durch eine Mahlkörpertrenneinrichtung aus dem mahlkörperfreien Raum abgeführt wird, dadurch gekennzeichnet, daß das Mahlgut in den von Mahlkörpern im wesentlichen freien Raum axial eingeführt und durch eine Stauscheibe zur Innenwandung des Mahlbehälters der Rührwerksmühle umgelenkt wird, wobei überwiegend eine radiale Durchströmung des Mahlbehälters bewirkt wird.Dispersion process in which a millbase consisting of solids and a liquid phase is introduced into an agitator mill containing grinding media and then conveyed, in which energy is supplied to the millbase by rotating rotors and the solids are broken down and wetted with the liquid phase, the rotors becoming separated rotate at such a high speed that the grinding media moved by them form a rotating grinding media bed lying against the inner wall of the grinding vessel of the agitator mill by the centrifugal force, a space essentially free of grinding media being created in the center of this grinding media bed and the grinding media bed being radial against the centrifugal effect Flows through to the inside in such a way that a centrifugal fluidized bed is formed with respect to the grinding media and then the ground material is removed from the grinding media-free space by a grinding media separating device, characterized in that the ground material is axially introduced into the space which is essentially free of grinding bodies and is deflected by a baffle plate to the inner wall of the grinding container of the agitator mill, predominantly causing a radial flow through the grinding container. Dispergierverfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Mahlgut beidseitig in dem Mahlbehälter eingeführt wird.Dispersing process according to claim 1, characterized in that the ground material is introduced into the grinding container on both sides. Rührwerksmühle zur Durchführung des Verfahrens nach Anspruch 1, bestehend aus - einem Mahlbehälter (1), in dem mit einem Antrieb über eine Antriebswelle (6) verbundene Rotoren (2) angeordnet sind, - einer Mahlkörpertrenneinrichtung (4), die im Inneren der Rotoren angeordnet ist, und - einem Mahlgutauslaß (5), dadurch gekennzeichnet, daß mindestens eine, vorzugsweise zwei oder mehrere am Umfang des Mahlbehälters angeordnete Zuleitungen (3) für das Mahlgut in eine rotierende Mahlkörperschüttung (9) vorgesehen sind, und daß eine Umlenkung des Mahlgutes nach dem Eintritt in den Mahlbehälter mittels einer kreisringförmigen Stauscheibe (10) erfolgt.Agitator mill for performing the method according to claim 1, consisting of - a grinding container (1) in which rotors (2) connected to a drive via a drive shaft (6) are arranged, - A grinding media separating device (4) which is arranged in the interior of the rotors, and - a regrind outlet (5), characterized in that at least one, preferably two or more feed lines (3) arranged on the circumference of the grinding container are provided for the material to be ground in a rotating bed of grinding media (9), and in that the material to be ground is deflected after entry into the grinding container by means of an annular baffle plate ( 10) takes place.
EP91103182A 1990-03-12 1991-03-02 Dispersion process and agitator mill for carrying out the process Withdrawn EP0446744A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007768 1990-03-12
DE19904007768 DE4007768A1 (en) 1990-03-12 1990-03-12 DISPERSION METHOD AND STIRRING MILL FOR ITS IMPLEMENTATION

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724023A3 (en) * 2005-05-17 2009-09-23 Ashizawa Finetech Ltd Circulation type media agitator mill
CN109046697A (en) * 2018-09-21 2018-12-21 广州鸿凯机械科技有限公司 Grind mechanism, dispersion grinder and dispersion grinding system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH581500A5 (en) * 1975-04-23 1976-11-15 Haslberger Josef Drive gear suspension for vertical sand grinder - has resilient blocks incorporated in three-point suspension system
WO1986002286A1 (en) * 1984-10-16 1986-04-24 Basf Lacke + Farben Aktiengesellschaft Dispersion process, and stirring machine for its implementation
DE3844380C1 (en) * 1988-12-30 1990-01-18 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Agitator mill with separating device in a rotating cage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH581500A5 (en) * 1975-04-23 1976-11-15 Haslberger Josef Drive gear suspension for vertical sand grinder - has resilient blocks incorporated in three-point suspension system
WO1986002286A1 (en) * 1984-10-16 1986-04-24 Basf Lacke + Farben Aktiengesellschaft Dispersion process, and stirring machine for its implementation
DE3844380C1 (en) * 1988-12-30 1990-01-18 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Agitator mill with separating device in a rotating cage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724023A3 (en) * 2005-05-17 2009-09-23 Ashizawa Finetech Ltd Circulation type media agitator mill
CN109046697A (en) * 2018-09-21 2018-12-21 广州鸿凯机械科技有限公司 Grind mechanism, dispersion grinder and dispersion grinding system

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Publication number Publication date
DE4007768A1 (en) 1991-09-19

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