WO1996033019A1 - Procede et dispositif de broyage par voie humide et dispersion de particules solides dans des liquides - Google Patents

Procede et dispositif de broyage par voie humide et dispersion de particules solides dans des liquides Download PDF

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Publication number
WO1996033019A1
WO1996033019A1 PCT/EP1996/001567 EP9601567W WO9633019A1 WO 1996033019 A1 WO1996033019 A1 WO 1996033019A1 EP 9601567 W EP9601567 W EP 9601567W WO 9633019 A1 WO9633019 A1 WO 9633019A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
grinding
grinding chamber
hollow shaft
chamber
Prior art date
Application number
PCT/EP1996/001567
Other languages
German (de)
English (en)
Inventor
Friedrich Vock
Original Assignee
Friedrich Vock
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
Priority claimed from DE19614295A external-priority patent/DE19614295A1/de
Application filed by Friedrich Vock filed Critical Friedrich Vock
Priority to EP96914911A priority Critical patent/EP0824374A1/fr
Priority to JP8531454A priority patent/JPH11503666A/ja
Publication of WO1996033019A1 publication Critical patent/WO1996033019A1/fr

Links

Classifications

    • 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
    • B02C17/168—Mills in which a fixed container houses stirring means tumbling the charge with a basket media milling device arranged in or on the container, involving therein a circulatory flow of the material to be milled

Definitions

  • the invention relates to a method and a device for wet grinding of solid particles in liquids by means of an agitator mill consisting of at least one grinding chamber containing grinding media, at least one rotor, wherein the grinding chamber and the rotor can be set in rotation independently of one another by means of at least one drive are and the regrind can be introduced into the grinding chamber via a hollow shaft.
  • Wet grinding means the comminution of solid particles of high strength in a liquid phase; dispersing the crushing of agglomerates which consist of strongly adhering primary particles and whose primary particles are to be dispersed in a liquid phase.
  • These wet processes are used in particular when the resulting products are to be further processed or used as a suspension, such as pigments and fillers in lacquer paints and printing inks, or magnetic solid particles for the coating of audio and video tapes.
  • Such a method or such a device is known from DE-44 19 919 C1.
  • This is an agitator ball mill with a vessel which can be at least partially filled with the product to be treated, a grinding container which can be rotated about a central axis in the vessel and has at least one wall area with an outer separating device which is separate from the product can be flowed through, but retains grinding aid contained in the grinding container, and an agitator which is arranged within the grinding container and can be rotated independently of the latter about the central axis.
  • This agitator mill consists of a preferably cylindrical, rotatable, with an inlet at its one end and an outlet at its other end, in which a stirrer shaft provided with stirring elements can be rotated.
  • Agitators in the form of concentric rings are provided on the inner circumference of the grinding container, which engage radially inward between the agitators of the agitator shaft and whose inside diameter is smaller than the outside diameter of the agitators of the agitator shaft, which are also formed by annular disks.
  • DD 290 317 A7 describes a device which consists of an outer cylinder, which represents the grinding vessel, and a concentrically arranged inner cylinder, an annular grinding gap being formed between the outer cylinder and the inner cylinder, which is composed of particles, grinding media and Existing suspension is flowed through.
  • the inner cylinder is stationary and the outer cylinder is arranged to rotate, an annular effective grinding gap between the outer cylinder and the inner cylinder being formed by the deposition of grinding media and particles of the material to be ground on the rotating outer cylinder.
  • the object of the present invention is in particular to reduce the disadvantages of the prior art, i. H. Shortening the dwell times of the ground material in the device according to the invention, simplifying the process control, avoiding expensive cooling devices in the actual grinding device and the applicability to the broadest possible spectrum of the ground material to be processed.
  • the grinding media located in the grinding chamber are strongly compressed by rotating the grinding chamber, in that the rotor is set in rotation, the rotational speeds of the grinding chamber and the rotor running in the same direction, and in that the rotor is constantly faster, constantly slower, alternating slower or faster or equally fast turns as the grinding chamber, that the ground material to be ground is passed through a hollow shaft into the grinding chamber containing the rotor and then the ground material is thrown into a collecting container via outlet openings as a result of the centrifugal force.
  • the grinding media with the suspension surrounding them and flowing through them must be transferred to a centrifugal field in order to establish a narrow grinding media packing structure and high normal forces between the grinding media.
  • the comminution process only starts when the compressed grinding media is additionally moved by rotating or vibrating tools, since only then the necessary shear stresses are generated on the solid particles. It is important that this relative movement and mixing movement is generated in the same direction as the chamber rotation, since only grinding media that move on a circular path build up the required centrifugal forces. Grinding media, the ex.
  • the grinding chamber is set in rotation by means of a rotatable hollow shaft in such a way that the bed of grinding media contained therein is strongly compressed. This creates high normal stresses for the particle loading of the suspension.
  • a rotor is also set in rotation via a hollow shaft, the rotor rotating in the same direction, but faster than the grinding chamber.
  • An intensive slip movement is triggered both between the rotor surface and the bed of grinding media and between the inside of the grinding bed of the grinding chamber.
  • Another preferred procedure for exciting a slip movement is that the grinding chamber and the rotor rotate in the same direction, but the rotor rotates more slowly than the grinding chamber.
  • Another preferred procedure consists in that, for example, the grinding chamber is periodically braked from a maximum speed to a lower speed and then accelerated again to the maximum speed.
  • the rotor entirely in this driving style.
  • Another preferred procedure is to set the grinding media bed in motion with a shearing effect, the hollow shaft being set in vibration by means of a flexible coupling and by means of an unbalanced mass.
  • a further advantageous method step consists in that the product stream is fed through the hollow shaft 5 via the rotor channels 41 into the grinding chamber 1 for a specific time interval ⁇ Ti, and that the product supply is then stopped for a specific time interval ⁇ T 2 , with ⁇ Ti during the time interval the speeds of rotor 2 and grinding chamber 1 are the same or almost the same and during the time interval ⁇ T 2 the speeds of rotor 2 and grinding chamber 1 are different.
  • the finest solid particles contained in the product stream are swept through the bulk material without shear for discharge (overflow), and the particles which are still too coarse will remain in the gap volume of the bulk material due to the classifying effect of the centrifuge function.
  • the above-mentioned object is achieved by a device for carrying out the method for wet grinding and dispersing solid particles in liquids in that the grinding chamber has a gaseous space arranged around the hollow shaft, that outlets on the circumference (10) of the grinding chamber are arranged for the regrind, and that the agitator mill is arranged directly on a collecting container for the regrind.
  • Fig. 1 is a sectional drawing of the agitator mill
  • Fig. 2 shows an example of a rotor
  • Fig. 3 shows an eccentrically mounted rotor
  • Fig. 5 is a diagram for the brake acceleration method Fig. 6 shows another embodiment of an inventive
  • the agitator mill consists of a grinding chamber 1 with a rotor 2.
  • the grinding chamber 1 is driven by a drive 8 'and a hollow shaft 5'.
  • the grinding chamber 1 is filled with grinding media 3.
  • the ground material 4 reaches the grinding chamber 1 via the inflow 38 through the hollow shaft 5.
  • the rotor 2 is shown in disk form in FIG. 1 and has agitating tools 28 at its peripheral end.
  • the stirring tools 28 can have all possible conceivable known shapes, for example, as shown, rod-shaped pins.
  • the hollow shaft 5 is closed at its end 37.
  • the hollow shaft has lateral openings 39 at its lower end.
  • Fig. 1 shows the state with the agitator mill rotating.
  • the millbase passes through the hollow shaft 5 through the lateral openings 39 of the hollow shaft 5, through the rotor 2.
  • the millbase 4 then reaches the circumference of the rotor 2 through the millbase 3 into the interior of the milling chamber 1.
  • At the upper end of the Grinding chamber 1 has openings 11 which serve as outlet openings for the material to be treated 4.
  • shields 30, which are open to the container wall 14 and which extend to the periphery of the grinding chamber 1, are attached above the openings 11, so that the ground material can spray outwards as a result of the centrifugal forces.
  • the various areas in the grinding chamber are indicated by the vertical dashed lines.
  • a gaseous space 9 is formed in its center.
  • the grinding chamber (1) has a closable opening (40) in the lower region, which is opened, for example, for rinsing the grinding chamber (1).
  • the entire agitator mill is fastened on a cover 36, which in turn closes a collecting container 14.
  • An agitator 19 is provided in the collecting container 14 and is driven by the drive 33.
  • a maximum regrind height 32 at a standstill and the regrind level 31 during operation of the agitator mill are shown in the collecting container (14).
  • the collecting container 14 can be provided with a cooling 21.
  • Reference numerals 22, 23, 34 and 35 are intended to indicate that a circular mode of operation is possible.
  • the regrind is fed through a line 23 into a circuit through the process.
  • braking devices 43, 43 ' are attached to the hollow shafts 5, 5'.
  • the basic principle of the agitator mill is that it is integrated into such a container at the same time. Since an enclosure is required for safety reasons anyway for machines with a rapidly rotating container, this requirement can be solved with the collecting container 14.
  • the ground material emerging from the grinding chamber 1 is allowed to flow freely into the collecting container 14.
  • a limited filling level is provided both for the ground material and for the grinding media, so that a radially limited gas space 9 is created in the center of the rotating chamber.
  • the filling level of the grinding media and the grist level are different.
  • the regrind 11 on the grinding chamber 1 can be realized by the correct arrangement of two to three bores with a guide to the outer casing.
  • the pipes rotating rapidly with the container act like pumps. After leaving these pipes, the regrind splashes through the container gas space against the container wall equipped with cooling. Irrespective of the degree of filling of the container, the entire wall surface can be used as a cooling device like a thin-film cooler.
  • the central gas space 9 of the grinding chamber 1 brings an additional effect for the release of the seal of the two rotating hollow shafts 5, 5 '. It only has to be sealed against a gas space 9 and not against the regrind 4 under conveying pressure and certainly not against the moving grinding media. A mechanical seal and a separating device can thus advantageously be dispensed with. It is also advantageous that the agitator mill arranged on the container can be moved up and down like a stationary agitator, so that the machine with the grinding media filling is easily accessible.
  • a further advantage is that when the batch is changed, the overall cleaning of the system can also be carried out in a simple manner by simply adding detergent and pumping it in a circle in order to thus the agitator mill, including the grinding media filling, the circular container by spraying with a rotating grinding chamber, and the circuit with the pump, pipeline and fittings.
  • the filled-in granular bed usually consists of spherical granules, the density of which is greater than the density of the suspension (preferred ratio 1.5 to 4.0) with mono- or polydisperse spherical diameter distributions per different average diameters of ⁇ 100 ⁇ m to 6 mm (preferred) ⁇ 500 ⁇ m).
  • the grinding media with the suspension surrounding them and flowing through them have to be transferred to a centrifugal field in order to establish a close packing structure and high normal forces between the grinding media. This is achieved by rotating the horizontal or vertical grinding chamber around its axis like a centrifuge.
  • the comminution mechanism only starts when the compressed grinding media bed is additionally moved relatively by rotating or oscillating tools, since only then the necessary shear stresses are generated on the solid particles.
  • 2 shows a possible embodiment of a rotor 2.
  • the rotor 2 is connected to the hollow shaft 5, which is closed at the bottom.
  • the hollow shaft 5 has lateral openings 39, to which two or more tubes 41 are connected.
  • a hollow annular disc 42 is provided at the outer ends of the tubes 41.
  • Rods 43 serving as stirring tools are attached to the hollow disk 42. The ground material can thus be conveyed outwards from the hollow shaft 5 through the tubes 41 via the disc 42 having cavities 26.
  • an eccentrically mounted rotor is shown in FIG. 3.
  • the hollow shaft 5 has an eccentricity e.
  • the rotor 2 is rotatably supported in front of the lower part of the hollow shaft 5.
  • the rotor 5 is dragged along by the grinding element immersion.
  • the speed of the hollow shaft is from 0 (standstill) to the speed of the grinding chamber, not shown.
  • the millbase is fed in via the lower end of the hollow shaft 5 through the rotor to the outside into the grinding chamber.
  • FIG. 4 Another preferred embodiment is shown in FIG. 4.
  • a coupling 45 provided with a bellows is inserted in the hollow shaft 5.
  • An unbalanced mass 46 is arranged below the flexible coupling, which is followed by the rotor 2, which actually rotates independently (as in FIG. 3).
  • the rotor can be dragged along with the grinding media.
  • the essential point is that the relative movement of the grinding media is achieved with a rotor 2 excited to circular vibrations m.
  • FIG. 5 shows a further variant for the driving style.
  • a brake acceleration cycle is shown there in the form of a diagram.
  • the grinding chamber 1 is first accelerated to a maximum speed n Tr -ma ⁇ and then decelerated to the speed n T r- in by means of the brakes 43, 43 '. Then a new acceleration phase of the grinding chamber 1 to n ⁇ r-ma begins.
  • the dashed curve shows the course over time of the bed of grinding media n M ⁇ s.
  • the difference between the curves n Tr - ⁇ M K S represents the slip ⁇ ⁇ n required for the shear.
  • ⁇ t ⁇ r, ⁇ t_ ⁇ , and ⁇ T are to be understood here as the different times of the braking duration, the acceleration duration and the total duration of a cycle.
  • FIG. 6 Another embodiment of an agitator mill is shown in FIG. 6.
  • the hollow shaft 5 is open at its lower end and closed on the side.
  • At the lower end there is a disk-shaped rotor with stirring tools.
  • the rotor divides the grinding chamber into two partial chambers 6 and 7.
  • the course of the product takes place in such a way that the ground material is guided through the hollow shaft 5 via the lower partial chamber 7 into the grinding bodies 3.
  • the millbase 4 then reaches the upper subchamber 6 and then through the opening 16 into the collecting container 14.
  • the diagram indicates that the lower subchamber 7 is filled with liquid, while the upper subchamber 6 has a gas cushion in the center as a result of the millbase overflow. This avoids the use of a mechanical seal.
  • Fig. 7 shows the use of several grinding chambers as a cascade.
  • three chambers 1, 1 'and 1 "are connected in parallel one above the other, each chamber 1, V and 1" being supplied with regrind by itself via the common hollow shaft 5.
  • All the reference numerals in both the deleted and uncoated form correspond to the reference numerals in FIG. 1.

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

Abstract

L'invention concerne un procédé et un dispositif de broyage par voie humide et de dispersion de particules solides dans des liquides au moyen d'un broyeur-agitateur constitué d'au moins une chambre de broyage (1) renfermant un élément broyeur (3), d'au moins un rotor (2), la chambre de broyage (1) et le rotor (2) pouvant être mis en rotation indépendamment l'un de l'autre par au moins une mécanisme d'entraînement (8, 8'). La matière à broyer (4) peut être acheminée jusqu'à la chambre de broyage (1) par un arbre creux (5). Les éléments broyeurs (3) situés dans la chambre de broyage sont fortement comprimés sous l'effet de la rotation de la chambre de broyage. Le rotor (2) est mis en rotation, la vitesse de rotation de la chambre de broyage (1) et celle du rotor (2) étant en phase. Le rotor (2) tourne toujours plus vite, tourne plus lentement, en alternance plus vite et plus lentement ou aussi vite que la chambre de broyage (1). La matière à broyer est guidée jusqu'à la chambre de broyage (1) contenant le rotor (2) par un arbre creux (5). Finalement, la matière à broyer est projetée dans un collecteur (14) par des orifices de décharge (11) sous l'effet de la force centrifuge.
PCT/EP1996/001567 1995-04-21 1996-04-13 Procede et dispositif de broyage par voie humide et dispersion de particules solides dans des liquides WO1996033019A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96914911A EP0824374A1 (fr) 1995-04-21 1996-04-13 Procede et dispositif de broyage par voie humide et dispersion de particules solides dans des liquides
JP8531454A JPH11503666A (ja) 1995-04-21 1996-04-13 流体中で固体粒子を湿式粉砕し且つ分散させるための方法と装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19514700 1995-04-21
DE19514700.6 1995-04-21
DE19614295.4 1996-04-11
DE19614295A DE19614295A1 (de) 1995-04-21 1996-04-11 Verfahren und Vorrichtung zum Nassmahlen und Dispergieren von Feststoffpartikeln in Flüssigkeiten

Publications (1)

Publication Number Publication Date
WO1996033019A1 true WO1996033019A1 (fr) 1996-10-24

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PCT/EP1996/001567 WO1996033019A1 (fr) 1995-04-21 1996-04-13 Procede et dispositif de broyage par voie humide et dispersion de particules solides dans des liquides

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Country Link
EP (1) EP0824374A1 (fr)
JP (1) JPH11503666A (fr)
WO (1) WO1996033019A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6565024B2 (en) 1998-11-02 2003-05-20 Vma-Getzmann Gmbh Dispersing device
CN111068858A (zh) * 2019-12-26 2020-04-28 黄亮亮 一种高效叶轮式纤维松解机

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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JP4174000B2 (ja) * 2003-02-27 2008-10-29 株式会社荒木鉄工 分散装置
JP4526930B2 (ja) * 2004-11-16 2010-08-18 株式会社資生堂 粉末混合粉砕装置
JPWO2006112164A1 (ja) * 2005-04-01 2008-12-04 寿工業株式会社 原料スラリー処理装置
TWI402639B (zh) * 2006-05-18 2013-07-21 Mitsubishi Chem Corp 底塗層形成用塗佈液，底塗層形成用塗佈液之製造方法，電子照片感光體，圖像形成裝置及電子照片匣
CN101443709A (zh) 2006-05-19 2009-05-27 三菱化学株式会社 底涂层形成用涂布液、具有涂布该涂布液而成的底涂层的感光体、使用该感光体的成像装置和使用该感光体的电子照相盒
JP5385480B2 (ja) * 2013-06-20 2014-01-08 株式会社エディプラス 攪拌用回転体および攪拌装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202364A (en) * 1961-11-03 1965-08-24 Holderbank Cement Method of and apparatus for grinding material
US3223336A (en) * 1960-12-30 1965-12-14 Wienert Fritz Otto Grinding apparatus
DE1223236B (de) * 1962-11-16 1966-08-18 Draiswerke Ges Mit Beschraenkt Ruehrwerkmuehle
GB1116980A (en) * 1965-03-16 1968-06-12 Southwestern Eng Co Machine for pulverizing or surface-treating material
DE2423376A1 (de) * 1973-05-15 1974-12-05 Union Process International Verfahren und vorrichtung zum mahlen von in einer fluessigkeit suspendierten feststoffteilchen
FR2631253A1 (fr) * 1988-05-16 1989-11-17 Vernijura Sa Procede de broyage et dispersion d'un produit ou d'un melange et installation pour la mise en oeuvre du procede
EP0369149A1 (fr) * 1988-11-18 1990-05-23 Eirich, Walter Broyeur malaxeur à boulets
EP0526699A1 (fr) * 1991-08-06 1993-02-10 Inoue Mfg., Inc. Appareil de broyage et de dispersion

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223336A (en) * 1960-12-30 1965-12-14 Wienert Fritz Otto Grinding apparatus
US3202364A (en) * 1961-11-03 1965-08-24 Holderbank Cement Method of and apparatus for grinding material
DE1223236B (de) * 1962-11-16 1966-08-18 Draiswerke Ges Mit Beschraenkt Ruehrwerkmuehle
GB1116980A (en) * 1965-03-16 1968-06-12 Southwestern Eng Co Machine for pulverizing or surface-treating material
DE2423376A1 (de) * 1973-05-15 1974-12-05 Union Process International Verfahren und vorrichtung zum mahlen von in einer fluessigkeit suspendierten feststoffteilchen
FR2631253A1 (fr) * 1988-05-16 1989-11-17 Vernijura Sa Procede de broyage et dispersion d'un produit ou d'un melange et installation pour la mise en oeuvre du procede
EP0369149A1 (fr) * 1988-11-18 1990-05-23 Eirich, Walter Broyeur malaxeur à boulets
EP0526699A1 (fr) * 1991-08-06 1993-02-10 Inoue Mfg., Inc. Appareil de broyage et de dispersion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6565024B2 (en) 1998-11-02 2003-05-20 Vma-Getzmann Gmbh Dispersing device
CN111068858A (zh) * 2019-12-26 2020-04-28 黄亮亮 一种高效叶轮式纤维松解机

Also Published As

Publication number Publication date
JPH11503666A (ja) 1999-03-30
EP0824374A1 (fr) 1998-02-25

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