WO2008098754A1 - Dispositif et procédé pour désagréger du produit à moudre - Google Patents

Dispositif et procédé pour désagréger du produit à moudre Download PDF

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Publication number
WO2008098754A1
WO2008098754A1 PCT/EP2008/001099 EP2008001099W WO2008098754A1 WO 2008098754 A1 WO2008098754 A1 WO 2008098754A1 EP 2008001099 W EP2008001099 W EP 2008001099W WO 2008098754 A1 WO2008098754 A1 WO 2008098754A1
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WO
WIPO (PCT)
Prior art keywords
grinding
sieve
punch
collecting container
preferred
Prior art date
Application number
PCT/EP2008/001099
Other languages
German (de)
English (en)
Inventor
Armin Brenner
Lorenz Graef
Simon Holz
Andreas Strasser
Heinrich Lieder
Armin Lange De Oliveira
Mika Linden
Original Assignee
Hte Aktiengesellschaft The High Throughput Experimentation Company
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 Hte Aktiengesellschaft The High Throughput Experimentation Company filed Critical Hte Aktiengesellschaft The High Throughput Experimentation Company
Publication of WO2008098754A1 publication Critical patent/WO2008098754A1/fr

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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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/08—Pestle and mortar

Definitions

  • the present invention relates to an apparatus and a method for comminuting regrind into particles having a particle size and particle size distribution which is as defined as possible and in a better yield than by prior art processes.
  • the synthesized materials e.g. in the form of extrudates or pellets, subjected to a mechanical treatment to obtain the desired particles.
  • the pulverulent materials used to produce the catalyst bed have as precisely defined particle properties, in particular particle size and particle size distribution.
  • a device for parallel comminution and sieving of catalysts is known, for example, from WO 02/04121.
  • This apparatus includes, but is not limited to, a comminuting body having four or more spatially separated apertures or depressions, each of the four or more apertures or depressions defining a comminuting zone having an internal comminuting surface.
  • the device according to WO 02/04121 comprises four or more comminution elements, wherein each of the four or more comminution elements is located at least partly within the comminution zone and is intended to comminute catalytic materials which are located within the four or more comminution zones.
  • said apparatus comprises one or more primary screens which define at least a portion of the inner crushing surface.
  • these primary screens are designed so that it is possible to simultaneously sieve all four or more catalytic materials while they are being comminuted so that these materials are separated into smaller particles penetrating through the primary screen and larger particles , which do not penetrate the sieve and in the
  • One of the objects of the present invention is to provide a device and a method which make it possible to comminute the material to be ground by means of a mechanical treatment in such a way that particles having desired target properties with regard to particle size and particle size distribution are increased in comparison with the processes of the prior art otherwise optimized yield can be achieved.
  • the device should be as simple as possible and / or have as few different components / components.
  • the device and the method should be suitable for the fact that a mechanical treatment of relatively small amounts of ground material is possible.
  • Another preferred object is to design the device in such a way that it can be used for the parallel comminution of different approaches to regrind.
  • apparatus and methods are to be used in the field of high-throughput research.
  • the device should be able to be operated at least partially or completely automatically.
  • a device for comminution of ground material which contains an upper grinding unit and a lower grinding unit, wherein at least one of the grinding units has one or more lifting element (s).
  • At least one, preferably the lower, grinding unit comprises at least one sieve insert or a part thereof.
  • this sieve insert comprises at least one grinding sieve (3) on a portafilter (2), wherein these two components are preferably separate units, which are relatively in at least one spatial direction can move to each other. More preferably, the grinding screen is fixed on the portafilter and is preferably supported or supported by this in the (vertical) z-direction.
  • the grinding wire (3) preferably comprises a wire mesh fabric.
  • a characteristic of the mill sieve used in each case is that it should have a defined, or as uniform as possible mesh size.
  • a grinding screen can be used whose mesh size is 150 microns. But it can also be used a grinding sieve whose mesh size is 500 microns.
  • the filter holder (2) is preferably a perforated plate or a plate which has a lattice-shaped structure, preferably a perforated plate with round or elongated openings.
  • the filter holder is more rigid, i. less flexible and / or less flexible than the grinding wire.
  • the shear modulus can be considered.
  • the filter holder as a whole has a larger shear modulus than the grinding screen.
  • At least one of the at least two grinding units comprises at least one grinding punch (6). More preferably, this grinding unit comprises at least one unit for driving the or the punch (s).
  • the grinding die is preferably detachably connected to the unit for driving.
  • the unit for driving preferably comprises an electric motor with a drive shaft and optionally a transmission. Both the drive torque and the drive speed are preferably controllable and controllable.
  • a drive motor can preferably be a DC motor, a stepper motor, a servo motor, a synchronous or asynchronous motor use.
  • a gearbox As embodiments for a transmission gear, chains or toothed belt transmission (or a combination thereof) can be used.
  • the translation can be adjusted by different combinations within certain limits and thus optimally adapted to the grinding process.
  • the device can preferably be operated with different grinding dies (6), the respective selection of the grinding punch depending on the given application. It is preferred if the grinding dies are made of a hard and wear-resistant material. Suitable materials include, for example, high-strength plastic, metal or ceramic, in particular silicon nitride, tungsten carbide or zirconium nitride. Composite materials are also preferred.
  • the grinding punch and the grinding screen are arranged so that the material to be ground can be introduced and comminuted between the grinding punch and the grinding wire.
  • the (bottom) surface of the grinding punch facing the material to be ground has the shape of a disk, preferably a circular disk.
  • the grinding material facing the surface of the mill (its "bottom") with Cavities (wells) is provided and therefore has a three-dimensional structure.
  • the cavities on the underside of the grinding disc can have different structures.
  • Preferred structures of the underside of the grinding disc are intersecting grooves or curved grooves which extend in a star shape from the edge of the punch disc to the center.
  • Such structuring in the surface (the underside) of the grinding die is at least partially prevented by grinding material is pressed into the annular gap, which forms or can form between the grinding die and the collecting container.
  • Preferred structuring of the underside of the grinding punch are shown in FIG.
  • the cavities preferably have a certain minimum depth.
  • the minimum depth and minimum width of the cavities is determined in a preferred embodiment of the method according to the invention by the desired particle size.
  • the cavities provide sufficient edge area so that a shearing force can be exerted on the particles to be ground. More preferably, the cavities should be at least of a larger dimension than the average particle size of the target fraction.
  • one of the grinding units preferably the lower grinding unit, comprises at least one collecting container (1), which preferably comprises the at least one sieve insert.
  • one or more holders for receiving the collecting container or the collecting container are preferably provided, which preferably also act as a wall (5) of the grinding screen or can be integrated with this.
  • the upper part of the collecting container preferably has a cylindrical inner space, wherein the diameter of the inner space is preferably slightly larger than the outer diameter of the grinding punch, wherein the grinding punch in this embodiment is preferably circular. This arrangement causes a total of the smallest possible annular gap forms when the grinding punch is inserted into the upper part of the sample container.
  • the collecting container is preferably of a multi-part construction and preferably has an upper part, the sample receiving container, and a lower part, the sample collecting container.
  • the fixing or supporting the grinding screen on the portafilter is preferably achieved by attaching the strainer insert at the top or bottom of the sample container by means of suitable fasteners. It is preferred here that the sieve insert is fastened in the lower part of the sample receiving container, preferably by means of releasable fastening elements.
  • the dimensioning and design of the device depends on the respective given technical requirements.
  • a characteristic index in the dimensioning of the device is given by the inner diameter of the collecting container.
  • the device preferably comprises a collecting container whose inner diameter is in a range of 2 to 20 cm. It is preferred here that the inner diameter of the sample container is smaller than 10 cm.
  • the collecting container and the holder for receiving the collecting container are preferably designed such that an anti-rotation device is provided, which prevents the collecting container or parts of the collecting container from being displaced or displaced by mechanical force of the grinding punch.
  • the rotation of the collecting container (1) in an associated holder is preferably Given that the outer part of the collecting container has edges and the insertion of the holder has a corresponding shape for receiving an angular collecting container. Numerous other embodiments of a rotation are possible.
  • the upper and / or the lower grinding unit is moved by means of at least one lifting element, preferably in the vertical direction.
  • the lifting element is a device for generating pressure forces.
  • the power transmission preferably takes place via movable and / or fixed abutments.
  • means are provided by means of which the lifting force and / or the lifting speed can be controlled and / or recorded or can.
  • the lifting elements preferably comprise hydraulic elements, spring elements and / or pneumatic elements.
  • pneumatic elements are driven at a pressure of 2 to 10 bar.
  • the device according to the invention has a stop by which the lifting movement can be decelerated or brought to a standstill in a predetermined position.
  • the stop is preferably designed such that it can prevent a part of the grinding unit, preferably the upper grinding unit, particularly preferably the grinding punch (6), being pressed directly onto the grinding wire (3).
  • the stop is configured as EndabscibilsAuth.
  • a distance sensor may be preferably incorporated in the device instead of (or in addition to) the stop. This distance sensor is preferably set to a fixed distance value and supplies at Achieve this target distance digital information that leads to the interruption of the grinding process.
  • the distance sensor provides a continuously correlated with the distance signal.
  • the signal of the sensor for switching off the grinding process is evaluated.
  • a microphone for receiving the airborne sound is in the vicinity of the grinding screen. As the filling of the grinding unit decreases, light grinding of the grinding punch on the grinding screen may occur. This is indicated by a noise, which can be detected by a suitable sound analysis.
  • a structure-borne sound converter is installed in the housing (5) of the grinding unit instead of the microphone.
  • a spectral analysis preferably in a frequency range of 10 Hz to 1 MHz or at least up to 500 kHz, the shift of the spectral components can be detected and thus be used to switch off the grinding unit.
  • a rigid filter holder is combined with a less rigid grinding screen, in particular with a wire mesh of wire mesh.
  • the wire mesh of the grinding screen, supported by the portafilter, although supported by the portafilter, has some flexibility or mobility, so that crushed particles can easily penetrate the mesh. Larger particles, which initially remain stuck in the mesh, may also be broken by the forces created by the movement of the wire mesh. A blockage of the wire mesh by particles that stick in the mesh without re-emergence is low due to the intrinsic flexibility.
  • Another advantage of the present invention is that at least one of the at least two grinding units also has a screening function. As a result, the device as a whole is smaller, lighter, better parallelizable and cheaper.
  • elements are provided which at least partially enable automatic operation or even fully automatic operation of the device.
  • the method according to the invention preferably comprises the following steps: a) filling a collecting container comprising at least one sieve insert with sieve carrier and grinding sieve with regrind, b) inserting the collecting container into a receiving device, c) positioning a first, upper grinding aggregate over a second, lower one , Grinding unit in a way that one D) carrying out a defined rotational movement of the grinding die in the horizontal plane, e) carrying out a vertical movement of the lower grinding unit in the direction of the grinding punch and / or the upper grinding unit in the direction of the sieve insert of the collecting container wherein the vertical movement in (e) is accompanied by a decrease in the amount of ground material.
  • steps (d) and (e) be carried out simultaneously.
  • the millbase be filled in the space between the punch and the sieve insert.
  • the rotational movement of the grinding die takes place either by means of an oscillating movement or by means of a continuously rotating movement.
  • the rotational movement which is characterized by the number of revolutions of the grinding punch per minute, is preferably in a range of 1 to 200 revolutions per minute, more preferably in a range of 2.5 to 100 revolutions per minute.
  • the oscillation frequency in the case of an oscillating movement depends on the deflection of the grinding disk or the angle of rotation of the grinding disk. It is preferred that frequencies of the order of 10 -2 to 4 Hz are used in oscillatory movement of the grinding disk.
  • step e it is preferred that the vertical movement of upper and / or lower grinding unit is regulated or controlled. Either a constant energy can be entered here or a constant speed can be applied.
  • the device according to the invention and the method according to the invention are particularly advantageously suitable for the production of particles compared with other methods known from the prior art, since the material to be ground is comminuted under particularly "mild" conditions which can be easily controlled.
  • material (regrind) is preferably comminuted whose hardness is less than the hardness of corundum.
  • the process according to the invention and the device according to the invention are particularly advantageously used for comminuting oxidic materials.
  • extrudates or small shaped bodies (pellets) are comminuted.
  • Target material in this context means amount of particle fraction which lies in a specific, desired size range and which has the narrowest possible particle distribution.
  • target material in methods for comminuting particles from the prior art (for example, ball mill or Torax grinding mill), a high proportion of particles is also often formed, which are smaller than the particles of the target fraction, the so-called "fines".
  • a high education council on fines leads to material loss and has the disadvantage that additional effort is made to separate the fines from the target fraction. This disadvantage is avoided or minimized by the method according to the invention and the device according to the invention.
  • Figure 1 shows a preferred embodiment of the device according to the invention, according to which the material to be ground (not shown) between a grinding die (6) and a filter holder (2) with grinding sieve (3) simultaneously crushed and sieved.
  • Figure 2 shows a schematic representation of another embodiment of the device according to the invention according to which the wall (5) a non-positive connection of the
  • FIG. 3 shows a further preferred embodiment in which the
  • Wall (5) is preferably connected to a fixed abutment (7). Further preferably, in this embodiment, the drive shaft (10) with a movable abutment (9) is connected.
  • FIG. 4 shows an alternative embodiment to that shown in FIG. 3, according to which the wall (5) is connected to a movable abutment (9)
  • Abutment is connected to a device suitable for the generation of pressure forces.
  • FIG. 5 shows a schematic illustration of the underside of three different grinding dies (6), which differ from one another with regard to the structuring of the cavities.
  • FIG. 6 is an illustration of an embodiment comprising a controller (24). The speed of the grinding die is measured and fed to a converter (25), which the
  • FIG. 7 shows a preferred arrangement according to the present invention, in which the pressure force on the collecting container is determined.
  • the signal of a transducer is fed to a regulator (21), which calculates it taking into account a desired value
  • S p determines the manipulated variable for an actuator (32).
  • Figure 8 shows a control regime in which the speed is kept constant with the same control arrangement as shown in Figure 6, but with the conversion of the torque.
  • Milling experiments were carried out on iron oxide pellets and on zirconium oxide pellets (the pellets were cylindrical and had a length of about 5 mm and a diameter of about 2 mm).
  • the apparatus was equipped with a sieve insert consisting of wire mesh and having a mesh size of 160 ⁇ m.
  • a comminution of the same starting materials was made for comparison also manually, wherein the materials to be crushed were first crushed by mortar and pestle and then triturated on a steel wire with the aid of a ceramic gun.
  • the target fraction in this example were particles whose average particle size was in the range from 125 to 160 ⁇ m.
  • the products were screened after comminution, using a sieve with a mesh size of 125 .mu.m.
  • collecting container (1) and grinding punch (6) are arranged vertically one above the other.
  • the collecting container (1) for particles comprises in this embodiment a filter holder (2) with associated grinding sieve (3).
  • the millbase i. the substance to be comminuted, which is to lead to particles with desired particle sizes and particle size distributions, is not shown in this figure, but is preferably located between the grinding punch (6) and the grinding wire (3).
  • the grinding punch (6) comprises cavities (4) for generating shearing forces on the material to be ground.
  • At least the grinding wire (3) is in physical contact with a wall (5), that is, it is detachably or permanently connected to it. It is further preferred that the grinding punch (6) via a drive shaft (10), and optionally a gear (11), with a motor (12) is in operative connection.
  • Figure 2 A further preferred embodiment of the present invention is shown in Figure 2, which substantially corresponds to the embodiment shown in Figure 1.
  • at least the portafilter (2), but preferably the grinding screen (3) and portafilter (2) are connected to a support structure (14) via a frictional connection (18) (not shown here).
  • FIG. 3 is also based on the embodiment according to FIG. 1.
  • this embodiment additionally has the following preferred features: on the one hand, the wall (5) is preferably connected to a fixed abutment (7).
  • the drive shaft (10) which is in operative connection with the grinding punch (6), via a bearing (13) for receiving axial and radial forces with a movable abutment (9) is in operative connection, which in turn with is connected to a device for generating pressure forces suitable means, or is in operative connection therewith.
  • This device which is suitable for generating pressure forces, is shown schematically in FIG. 3 by arrows.
  • FIG. 1 An alternative preferred embodiment according to the present invention is shown in FIG. Accordingly, the wall (5) is in frictional connection, and is preferably releasably or permanently attached to a movable abutment (9), which in turn is connected to a device for generating pressure forces suitable means, which is shown schematically by arrows. Accordingly, the drive shaft (10), which leads to the punch (6), connected via a bearing (13) for receiving axial and radial forces with a fixed abutment (7).
  • FIG. 5 shows a schematic representation of three different grinding dies (6), which differ from one another with respect to the structuring of the cavities on the underside.
  • this structuring is represented by two lines crossing in the middle given, these intersecting lines preferably have an offset in the middle.
  • At least the width of the cavities, which are present in the form of a line, should be greater than the largest desired particle diameter. Likewise, the depth of these cavities should preferably be greater than the largest desired particle size. The same applies to the length of these linear cavities.
  • the structuring is given by lines having an H-shape.
  • the structuring is given by intersecting wave-shaped or star-shaped lines.
  • the pressing force acting on the grinding die which may be represented by, for example, the spring (26), with the speed of the grinding punch by regulation.
  • FIG. 6 shows a preferred embodiment of the invention comprising a regulator.
  • the speed of the grinding punch is measured and fed to a converter (25). This converts the speed into a standard signal, which can be processed by a controller (24).
  • the controller controls the motor in such a way that the speed specified by means of a setpoint input S p is maintained.
  • the control value can be recorded by means of the registration unit (23).
  • a decreasing control value is observed on the controller, which corresponds to a decrease in the torque.
  • the criterion for switching off the milling process can be derived from the course of the torque. If the torque falls below a limit whose value is to be determined experimentally, the shutdown of the grinding process should take place.
  • FIG. 7 shows an arrangement according to which the contact pressure force is determined by a force unit signal converter (31).
  • the signal of the converter is supplied to the controller (21), which determines the manipulated variable for the force-generating actuator (32) taking into account the setpoint value S p .
  • the controller 21
  • the controller determines the manipulated variable for the force-generating actuator (32) taking into account the setpoint value S p .
  • arrangements with strain gauges or piezoresistive sensors with a corresponding matching amplifier can be used as power unit signal converters.
  • electromagnetic actuators can preferably be used.
  • the switch-off criterion can be derived from the control value of the speed controller 24.
  • FIG. 8 shows a control regime in which the rotational speed is kept constant with the same control arrangement as shown in FIG.
  • a transducer (22) converts the torque received at the shaft of the mill into a unitary signal.
  • This is now fed to the controller (21) as an actual value.
  • this controller determines the manipulated variable for the actuator (20).
  • the grinding result can be taken either at the control value of the speed controller (as shown in the drawing) or at the control value of the force regulator (not shown in the drawing).
  • the switch-off criterion is derived from the control value of one of the controllers, the detection takes place as described in FIG.
  • the force measurement can also take place indirectly.
  • the actuator used in such an arrangement is a piston or a diaphragm actuator.
  • Actuators is the generation of force by applying
  • Print As a medium for pressure transmission, a liquid or a gas can be used. Due to the geometric properties of the actuator, the transmission ratio pressure in force is determined. Consequently, by a
  • the pressure control consists of the components converter pressure in unit signal (27), the Controller with setpoint input S p (21), the actuator (29) and the supply of pressurized control fluid (30).
  • a distance sensor may be preferably incorporated in the device instead of (or in addition to) the stop. This distance sensor is preferably set to a fixed distance value and, upon reaching this target distance, provides digital information which leads to the interruption of the grinding process.
  • the distance sensor provides a continuously correlated with the distance signal.
  • the signal of the sensor for switching off the grinding process is evaluated.
  • a microphone for receiving the airborne sound is in the vicinity of the grinding screen. As the filling of the grinding unit decreases, light grinding of the grinding punch on the grinding screen may occur. This is indicated by a noise, which can be detected by a suitable sound analysis.
  • a structure-borne sound converter is installed in the housing (5) of the grinding unit instead of the microphone.
  • the vibration signal preferably detecting "scratching" noises
  • signal of Endabschalters falls below a predetermined torque or distance measurement.
  • control fluid compressed gas or compressed fluid

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

Abstract

L'invention concerne un dispositif et un procédé pour désagréger du produit à moudre en particules ayant une taille de particules et une distribution granulométrique les plus définies possibles, avec un rendement amélioré. Le dispositif comprend au moins un organe de meulage supérieur et un organe de meulage inférieur, sachant qu'au moins un des organes de meulage est fonctionnellement relié à un ou plusieurs éléments de levage, et sachant qu'au moins un organe de meulage comporte au moins un tamis rapporté. Le tamis rapporté comprend au moins un tamis de mouture (3) sur un porte-tamis (2), sachant que le tamis de mouture et le porte-tamis sont des unités séparées qui peuvent se déplacer l'une par rapport à l'autre dans au moins une direction spatiale.
PCT/EP2008/001099 2007-02-13 2008-02-13 Dispositif et procédé pour désagréger du produit à moudre WO2008098754A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007007075.8 2007-02-13
DE200710007075 DE102007007075A1 (de) 2007-02-13 2007-02-13 Vorrichtung und Verfahren zur Zerkleinerung von Mahlgut

Publications (1)

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WO2008098754A1 true WO2008098754A1 (fr) 2008-08-21

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WO (1) WO2008098754A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323790A (zh) * 2016-10-28 2017-01-11 福建工程学院 一种颗粒研磨粉碎试验装置
CN109197541A (zh) * 2017-07-05 2019-01-15 苑春亭 一种水产养殖前期使用池塘底泥肥水的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011106042U1 (de) 2011-09-19 2011-11-15 Arman Emami Vorrichtung zum Zerkleinern
DE202017005765U1 (de) 2017-10-23 2017-11-16 Kevin Canamares Navarro Vorrichtung zum Zerkleinern
DE102017010277B4 (de) 2017-10-27 2021-12-23 Kevin Canamares Navarro Vorrichtung zum Zerkleinern

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002004121A2 (fr) * 2000-07-07 2002-01-17 Symyx Technologies, Inc. Procedes et appareil de traitement mecanique de materiaux tels que les catalyseurs

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002004121A2 (fr) * 2000-07-07 2002-01-17 Symyx Technologies, Inc. Procedes et appareil de traitement mecanique de materiaux tels que les catalyseurs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323790A (zh) * 2016-10-28 2017-01-11 福建工程学院 一种颗粒研磨粉碎试验装置
CN106323790B (zh) * 2016-10-28 2023-12-19 福建工程学院 一种颗粒研磨粉碎试验装置
CN109197541A (zh) * 2017-07-05 2019-01-15 苑春亭 一种水产养殖前期使用池塘底泥肥水的方法
CN109197541B (zh) * 2017-07-05 2020-09-01 苑春亭 一种水产养殖前期使用池塘底泥肥水的方法

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