KR102339136B1 - Device and method for high energy and/or fine milling of particles - Google Patents

Abstract

The present invention relates to an apparatus (1) for high-energy- and/or fine grinding of particles using a flowable grinding body in a closed gas atmosphere and a method for high-energy- and/or fine grinding of particles. The device 1 comprises a grinding container 2 for receiving particles and grinding bodies with a closed housing 3 and a grinding chamber 4 located therein. A rotor 6 for accelerating the grinding body during the grinding process is rotatably supported in the grinding container 2 . The grinding container 2 is formed in a cylindrical shape and extends along a horizontal longitudinal axis 5 .
The device 1 comprises a measuring device 12 for measuring the size of the particles. The grinding container 2 has at least one connecting connection 10 , 17 , 20 for connection with the measuring device 12 . A measuring device 12 is connected to the grinding container 2 so that during the grinding process particles can be removed from the grinding chamber 4 and measured.

Description

DEVICE AND METHOD FOR HIGH ENERGY AND/OR FINE MILLING OF PARTICLES

The present invention relates to an apparatus and method for high-energy- and/or fine grinding of particles using a flowable grinding body.

Such devices, particularly ball mills, are used for ultrafine grinding or homogenization of pulverized materials. The pulverizing material fills the inside of the pulverizing chamber together with the pulverizing body in the form of a ball, and is moved by a driven rotor. When the moving ball collides with the pulverizing material, the pulverized material is pulverized. Ball mills enable grinding in a gas atmosphere, for example in the production of metal hydrides, i.e. in the grinding of metal alloys in a hydrogen atmosphere, or fine grinding of metal hydrides in a protective gas atmosphere using, for example, argon. do. Basically any material can be used as grinding material, for example stone, cement, wood, pigments and metal alloys. The pulverizing material may be pulverized into particles having a size of several nm to several μm.

A ball mill is disclosed, for example, in DE 196 35 500 A1. The ball mill includes a grinding container having a grinding chamber therein, the grinding chamber being capable of receiving a batch of flowable grinding bodies. A rotor is arranged in the grinding chamber, the shaft of which is drivable with respect to the stationary grinding body. The crushing container has a connecting pipe, which makes it possible to fill the inside of the crushing container with the crushing material and to remove the crushed material after the end of the crushing process.

The particle size of the grinding material can be influenced by a plurality of parameters such as, for example, the rotational speed of the rotor, the ratio between the grinding body and the grinding material, in particular the mass ratio, in particular the grinding duration. These parameters are different for each grinding material. Especially when grinding in a closed gas atmosphere, it is impossible to open the grinding chamber to control the particle size during the grinding process without the disruption of the gas atmosphere. This results in, for example, when using metal hydrides, these metal hydrides inadvertently come into contact with oxygen and in some cases become unusable. Thus, in order to obtain particles having a desired particle size, different batches of the same grinding material may have to be grinded with different grinding parameters. This leads to uneconomical operation of the ball mill, since, under certain circumstances, the grinding material must be discarded if the grinding result is insufficient.

The object of the present invention is to provide an apparatus for high-energy- and/or fine grinding of particles, which enables economical operation. It is also to provide an economical method for high-energy- and/or fine grinding of particles.

The above problem is solved by a device having the features of claim 1 and by a method having the features of claim 11 .

The device according to the invention comprises a measuring device for measuring the particle size of the grinding material. The grinding container has at least one connecting connection for connection with a measuring device. A measuring device is connected to the grinding container so that during the grinding process particles are removed from the grinding chamber and the size of the particles can be determined. Preferably, the connecting contact is formed as the first connecting contact. Optionally, the removal of particles may be continuous or discontinuous.

Measurement of the particle size during the grinding process enables grinding parameters such as, for example, the rotational speed of the rotor and the grinding duration to be adjusted even during the grinding process, so as to obtain the desired particle size of the grinding material, even if it is a minimum grinding number is needed

Preferably the particle size is determined by laser diffraction analysis. In this case the particles are removed from the grinding container in a degassing stream and passed through the laser beam for laser diffraction analysis at the measuring point of the measuring device. A universal method for particle size determination by laser diffraction analysis is published and is described, for example, in ISO 13320 (2009). Laser diffractometers are commercially available, for example, from Malvern Instruments GmbH (Herenberg, Germany) or from Sympatec (Klaustal-Zellerfeld, Germany).

According to an embodiment of the invention the measuring device is connected to the gas supply line and is configured to guide the gas supply flow from the gas supply line through the connecting connection into the grinding chamber in a first switched state during the grinding process. Preferably, the gas supply line is connected to the gas reservoir, so that a continuous gas supply flow is ensured. The grinding material moving in the grinding chamber tends to clog the first connecting connection by sticking, so that particles can no longer be removed from the grinding chamber. A corresponding blockage of the first connecting connection during operation of the mill outside of the removal time is prevented by the continuous gas supply flow into the grinding chamber.

According to another embodiment of the present invention, the measuring device is also configured, in the second switching state, for drawing the gas removal stream together with the particles contained therein from the grinding chamber and for carrying it in the direction of the measuring device for particle size measurement. , formed to create a negative pressure by the gas supply flow flowing from the gas supply line. A negative pressure is preferably created in the measuring device. Optionally in the second switching state the gas supply stream is diverted to draw the degassing stream from the grinding chamber by creating a negative pressure, similar to the principle of a waterjet pump. The switching of the measuring device from the first switching state to the second switching state and/or vice versa can take place manually or automatically by the measuring device.

The grinding container has two opposite end faces, said end faces each extending transversely to a longitudinal axis of the grinding container, a first connecting connection disposed on one of the end faces, from the longitudinal axis Embodiments positioned in imaginary lines extending radially and substantially horizontally are also preferred. Preferably, the first connecting connection is arranged at the center of an imaginary line extending horizontally, ie at the center between the longitudinal axis and the inner wall of the grinding container. During the grinding process the particles in the grinding chamber have a non-uniform size distribution. Larger and heavier particles travel in the lower region of the grinding chamber, ie below an imaginary line extending horizontally, while lighter particles travel in the upper region of the grinding chamber, ie above an imaginary line extending horizontally . In the context of the present invention, it has been found that the corresponding arrangement of the first connecting connection in a horizontally extending line representing the size distribution of the particles in the grinding container makes it possible to remove the particles from the grinding container. A representative measurement of the particle size by means of a measuring device is thus ensured.

In another embodiment of the invention the first connecting connection has one circular passage with a diameter of 0.1 mm to 5 mm, preferably 3 mm to 4.1 mm, particularly preferably approximately 4 mm. Optionally, a passage is provided in the insert, which can be inserted into the first connecting connection. Preferably the balls inside the grinding chamber have a much larger diameter than the circular passage. This prevents ejection of the balls from the grinding chamber via the first connecting connection. In the context of the present invention, it has been found that the shape of the first connecting connection having only one circular passage is particularly simple and reliably free of blockages. If the measuring device optionally directs a continuous gas supply flow through the first connecting connection into the grinding chamber, the gas supply flow can pass through one circular passage, thereby emptying the passage. Unlike filtration, for example, a possible build-up of particles at the back of the filtration net, which can react with oxygen and ignite, is prevented.

An embodiment in which the apparatus comprises a degassing stream removed from the grinding chamber and a return line for recovering the particles contained therein from the measuring apparatus into the grinding chamber is particularly preferred. The recovery line enables automatic recovery of the removed particles into the grinding chamber. The ratio between the grinding material and the grinding body in the grinding chamber is maintained during the grinding process by a recovery line of the removed particles. Thereby, it is ensured that the expected required residual grinding duration determined by particle size measurements of the particles removed from the grinding chamber will reliably result in the desired particle size. Optionally, the grinding container has a second connecting connection for recovery of the degassed stream removed from the grinding chamber for particle size determination, in which case the return line is connected to the second connecting connection. The second connecting connection can be arranged on one of the two end faces of the cylindrical grinding container or on one of the outer faces. Optionally, the particles are withdrawn into the grinding chamber with a degassing stream through a return line and a second connecting connection. Depending on the continuous or discontinuous removal of the degassing flow from the grinding chamber and of the particles contained therein, optionally the degassing flow back into the grinding chamber and the recovery of the particles contained therein likewise continuously or discontinuously takes place. Preferably, the grinding process is not interrupted during recovery.

It is particularly preferred in an embodiment in which the return line comprises a fan, the fan conveying the degassing stream and the particles contained therein into the grinding chamber. Optionally, after particle size measurement of the measuring device, the fan carries the degassing stream and the particles contained therein through a recovery line into the grinding chamber.

It is also preferred in an embodiment in which the recovery line includes a separator for separating particles contained in the degassing stream, and the degassing stream and the separated particles are separately recovered into the grinding chamber. Separation of the measured particles from the degassing stream prevents the particles from being drawn by the fan and possibly damaging the fan. Preferably the separator is configured as a cyclone, which cyclone enables separation of the particles from the gas removal stream. An advantage of cyclones is that they dynamically separate particles. Thus, when using a cyclone as separator, there is no need to replace the filter, which has to be interrupted by the protective gas chain. For example, the separator is arranged behind the measuring point of the measuring device in the direction of flow of the gas flow from the grinding chamber towards the measuring device. Preferably the return line is connected to a second connection connection on the grinding container and via a separator to a third connection connection on the grinding container. The second connecting connection is used for recovery of the gas removal stream. A third connecting connection is used to return the separated particles into the grinding chamber. The recovery of the material separated by the cyclone back into the grinding chamber preferably takes place continuously. However, it is also possible to recover the particles separated by the cyclone into the grinding chamber discontinuously. This can be done, for example, by means of a gearwheel slew.

According to another embodiment, an overpressure is supplied to the grinding chamber. Preferably the pressure inside the grinding chamber is 100 to 200 mbar higher than the ambient pressure, ie 1.1 bar to 1.2 bar. The removal and grinding of particles from the grinding container is preferably carried out under overpressure, whereby a closed gas atmosphere can be maintained even with less leakage in the grinding chamber. The reaction of the grinding material with undesirable impurities in the vicinity of the grinding container, for example oxygen and/or nitrogen, is thus prevented. In addition, damage to the pulverized material due to moisture present in the ambient air is also prevented. A gas, for example nitrogen, argon or hydrogen, is introduced into the grinding chamber after the grinding material and the grinding body have been provided into the grinding chamber until a predetermined pressure inside the grinding chamber prevails, thereby creating an overpressure inside the grinding chamber. The maintenance of overpressure during the grinding process is preferably effected by introduction, preferably continuous, of a gas feed stream from the gas reservoir into the grinding chamber. However, it is also possible to provide other connecting connections to the grinding container, by means of which gas can be introduced into or removed from the grinding chamber. Preferably, pressure fluctuations in the grinding chamber can be compensated for in this way.

Also preferred is an embodiment wherein the device comprises a safety device, the safety device being configured to prevent the pressure inside the grinding chamber from exceeding a predetermined threshold, thereby maintaining the pressure inside the grinding chamber substantially constant. Preferably, the safety device is configured as a relief valve, said valve being arranged between the measuring device and the first connecting connection. Preferably the gas reservoir has a pressure higher than the pressure inside the grinding chamber. Optionally, the pressure inside the gas reservoir is approximately 200 bar to 300 bar, and the predetermined pressure inside the grinding chamber is 1.1 bar to 1.2 bar. Accordingly, the gas supply flow introduced into the grinding chamber during the grinding operation flows in the direction of the grinding chamber even at a pressure higher than a predetermined pressure inside the grinding chamber. This prevents the pressure inside the grinding chamber from falling below a predetermined threshold, for example corresponding to a predetermined pressure inside the grinding chamber. In order to also prevent exceeding the threshold value, the relief valve is adjusted to release the gas to the environment, for example through a chimney, when the pressure inside the grinding chamber exceeds the threshold value. Optionally the gas reservoir comprises a decompression device, so that the gas supply flow does not flow into the grinding chamber at the pressure inside the gas reservoir, but is directed into the grinding chamber at a comparatively lower pressure, for example a pressure of 5 bar. The reduced pressure of the gas supply stream is always higher than the predetermined pressure inside the grinding chamber.

The invention also relates to a method for high-energy- and/or fine grinding of particles having the features of claim 11 . This allows economical operation of the device as described above. By predicting the remaining grinding duration, one grinding of the batch is sufficient to achieve the desired particle size. Thus, material and time can be saved. Optionally, the removal of particles in step (b) may be continuous or discontinuous. Accordingly, optionally, the measurement of particles in step (c) may also be made continuously or discontinuously.

Except during steps (b) and (c) in an optional embodiment of the present invention, the gas supply flow flows from the gas supply line through the connecting connection into the grinding chamber. The grinding material moving in the grinding chamber tends to stick to the first connecting junction and block the connecting junction, so that no further particles can be removed from the grinding chamber. The continuous gas supply flow into the grinding chamber prevents the first connecting junction from clogging during operation of the mill outside of the removal time.

According to an embodiment of the present invention, the measuring device is switched to a first switching state except during steps (b) and (c), wherein in the first switching state the gas supply flow flows from the gas supply line through the first connecting connection. flow into the grinding chamber. The switching of the measuring device to or from the first switching state, optionally from the first switching state, to another switching state can take place manually or automatically.

In an embodiment of the invention the removal of particles in step (b) is effected by switching the measuring device to a second switched state, wherein in said second switched state the degassing flow is directed from the grinding chamber together with the particles contained therein. A gas supply stream flowing from the gas supply line creates a negative pressure for sucking in and for transporting the particles in the direction of the measuring device for measurement. Optionally in the second switching state the gas supply stream is diverted such that the flow creates a negative pressure to draw the degassing stream from the grinding chamber, similar to the principle of a waterjet pump.

Embodiments of the invention in which particles are withdrawn into the grinding chamber after step (c), ie after particle size measurement, are also preferred. In order to enable as accurate a prediction of the grinding duration as possible depending on the particle size to be achieved, a preferably constant ratio between the grinding body and the grinding material during the grinding process is necessary. This is ensured by the recovery of the measured particles into the grinding chamber. Optionally, a fan is used for this.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. The drawings show only preferred embodiments and do not limit the invention in any way.

1 shows a schematic diagram of a device according to the invention;

1 shows an apparatus formed as a ball mill 1 for high-energy- and/or fine grinding of particles using a flowable grinding body in a closed gas atmosphere.

The ball mill 1 comprises a grinding container 2 for accommodating the grinding material and the grinding body. The grinding container 2 comprises a closed housing 3 and a grinding chamber 4 located therein, to which an overpressure can be provided. The grinding container 2 is formed in a cylindrical shape and extends along a horizontal longitudinal axis 5 . A rotatably supported rotor 6 for acceleration of the grinding body during the grinding process is arranged in the grinding container 2 . The rotor 6 has a shaft 7 , on one side of which is supported in the housing 3 of the grinding container 2 . A shaft 7 extends along a longitudinal axis 5 of the grinding container 2 and is driven by a motor 8 .

The grinding container 2 also has two opposite end faces 9 , each of which extends transversely to the longitudinal axis 5 of the grinding container 2 . A first connection connection 10 is arranged on one of the end surfaces 9 of the grinding container 2 , said first connection connection radially and substantially horizontally from the longitudinal axis 5 . It is positioned on an extended virtual line. The first connecting connection 10 comprises an insert 11 having one circular passage with a diameter of approximately 3 to 4 mm. However, it is also conceivable for the first connecting connection 10 to be arranged on the outer surface 18 of the cylindrical grinding container 2 .

The ball mill 1 comprises a measuring device 12 for measuring the size of the particles. The measuring device 12 is connected to the grinding container 2 via a first connecting connection 10 so that particles can be removed from the grinding chamber 4 and measured during the grinding process. The measuring device 12 is also connected to the gas reservoir 14 via a gas supply line 13 , for example to a gas bottle.

The measuring device 12 is configured to guide the gas supply flow from the gas supply line 13 through the connecting connection 10 into the grinding chamber 4 in the first switched state during the grinding process. The measuring device is further configured, in the second switching state, for carrying the degassing stream in the direction of the measuring device 12 for drawing the particles out of the grinding chamber 4 together with the particles contained therein and for measuring the particles; It is formed so as to create a negative pressure inside the measuring device 12 by means of a gas supply flow flowing from the gas supply line 13 .

The measuring device 12 comprises a measuring point 15 , at which the particle size is determined by means of laser diffraction analysis. For this purpose, a degassing stream is passed through the laser beam at the measuring point 15 of the measuring device 12 together with the particles contained therein. Determination of particle size using laser diffraction analysis is not described in detail as it is publicly available.

The ball mill 1 also comprises a recovery line 16 for recovering the degassing stream and the particles contained therein from the measuring device 12 into the grinding chamber 4 . The return line 16 is connected to the measuring device 12 and to the grinding chamber 4 via a second connection connection 17 and a third connection connection 20 . A second connection connection 17 and a third connection connection 20 are arranged on the outer surface 18 of the cylindrical grinding container 2 .

The return line 16 includes a separator formed as a cyclone 19 for the separation of particles contained in the degassing stream. The cyclone 19 is thus also connected to the grinding chamber 4 via a return line 16 and a third connecting connection 20 .

The return line 16 also comprises a fan 21 , by which the degassing stream and the particles contained therein are conveyed from the measuring device 12 to the cyclone 19 . The separated particles in the cyclone 19 are guided into the grinding chamber 4 via a third connecting connection 20 . The particle-free degassing stream flows through the fan ( 21 ), passes through the fan and through the second connecting connection ( 17 ) into the grinding chamber ( 4 ). The particle-free degassing stream and the separated particles are withdrawn, ie separately, into the grinding chamber 4 . Optionally, it may be contemplated to at least partially discharge the particle-free degassing stream into the environment, rather than completely guiding it into the grinding chamber 4 . This prevents that the pressure inside the grinding chamber 4 is too high and the particles cannot flow from the cyclone 19 into the grinding chamber 4 . The pressure inside the grinding chamber 4 is set such that there is a pressure drop between the cyclone 19 and the grinding chamber 4 such that a particle-free gas removal stream is only at least partially supplied into the grinding chamber 4 . , the particles flow from the cyclone 19 into the grinding chamber 4 .

As an alternative, the cyclone 19 and the third connecting connection 20 can be omitted. In this case the entire degassing stream is withdrawn into the grinding chamber 4 via the second connecting connection 17 by way of a return line 16 together with the particles contained therein. This presupposes that the fan 21 is formed so that it can flow through without damage by the degassing flow and the particles contained therein. Corresponding fans are commercially available.

The ball mill 1 also comprises a safety device formed as a relief valve 22 , which is configured to prevent the pressure inside the grinding chamber 4 from exceeding a predetermined threshold value, thereby preventing the grinding chamber 4 from exceeding a predetermined threshold. (4) keep the internal pressure substantially constant. A relief valve 22 is arranged between the first connecting connection 10 and the measuring device 12 . However, to arrange the relief valve 22 to be protected by a filter, for example directly in the grinding chamber 4 , optionally at one of the end faces 9 of the grinding chamber or on the outer face 18 . may be considered.

The grinding container 2 also comprises at least one closable opening 23 for supplying grinding bodies and grinding material in the form of particles. After the end of the grinding process, the crushed particles and the grinding bodies are again removed from the grinding container 2 through the closable opening 23 .

In the following the function of the ball mill 1 is explained by means of a method for high-energy- and/or fine grinding of particles using a flowable grinding body.

In a first step the flowable grinding body is fed into the grinding chamber 4 through a closable opening 23 in the grinding container 2 .

Thereafter, gases such as nitrogen, argon or By guiding hydrogen, the grinding chamber is deactivated. The supply of gas is via a selectively closable opening 23 , a separate connection connection (not shown) or a first connection connection 10 . Thereafter, the solid to be pulverized in powder form comprising a plurality of particles is provided into the pulverizing chamber 4 through the closable opening 23 in the pulverizing container 2 . This is preferably done by means of an inert line, so that ambient air, in particular oxygen, together with the grinding material is introduced into the already inactivated grinding chamber 4 . Optionally a sluice is used for feeding the grinding material into the grinding chamber 4 .

In step (a) the rotor 6 of the ball mill 1 is driven by the motor 8 for acceleration of the grinding body in the grinding chamber 4 . The accelerated grinding body swirls in the grinding chamber 4 and collides with the particles to be comminuted.

During the grinding process in step (b) the particles are removed from the grinding chamber 4 via the first connecting connection 10 , and in method step c) the size of the particles is measured by means of a measuring device 12 . The measured particle size determines the individual grinding parameters, for example the rotational speed of the rotor 6 and/or the remaining grinding duration. The determination of the grinding duration can be made either by itself by the operator of the ball mill 1 or automatically by a computing unit (not shown).

Steps (a) to (c) are carried out and in particular repeated until a predetermined size of the particles is achieved. After that, the closable opening 23 in the grinding container 4 is opened, and the crushed particles are removed from the grinding chamber 4 . Removal of particles from the grinding chamber 4 is effected by installing a container (not shown) in a closable opening 23 and the container being inactivated with an optional connection between the opening 23 and the container. The milled particles are then removed from the milling chamber 4 and fill the interior of the container. As an alternative, it may be contemplated to provide additional openings in the grinding container 2 , which are used for the removal of crushed particles and particle residues and for cleaning of the grinding chamber 4 .

Except during steps (b) and (c), the measuring device 12 is switched to the first switching state, so that the gas supply flow from the gas supply line 13 through the first connecting connection 10 to the grinding chamber ( 4) flow into and block the connecting junction.

During the grinding operation, the relief valve 22 prevents the pressure inside the grinding chamber from exceeding a predetermined threshold, thereby keeping the pressure inside the grinding chamber 4 substantially constant.

The removal of particles from the grinding chamber 4 is effected during step (b) by manually or automatically switching the measuring device 12 to the second switching state. In the second switching state, the gas supply stream flowing from the gas supply line carries the degassing stream and the particles contained therein in the direction of the measuring device 12 for sucking from the grinding chamber 4 and for measuring the particles. To do this, a negative pressure is created in the measuring device 12 .

The gas removal stream removed from the grinding chamber 4 is guided to a measuring point 15 in the measuring device 12 , at which the particle size is determined by means of laser diffraction analysis.

After the measurement, the degassing stream removed from the grinding chamber 4 and the particles contained therein are conveyed to the cyclone 19 via a recovery line 16 using a fan 21 . The cyclone 19 separates the particles contained in the degassing stream from the degassing stream, and the particles are then guided into the grinding chamber 4 through the third connecting connection 20 . The remaining gas removal stream, which does not contain particles, is conveyed separately, ie separated from the particles, into the grinding chamber 4 via the second connecting connection 17 .

As an alternative, the cyclone 19 and the third connecting connection 20 can be omitted. In this case, the degassing stream is carried with the particles contained therein by means of a fan 21 via the return line 16 to the second connecting connection 17 and into the grinding chamber 4 .

1 ball mill
2 crushing container
3 housing
4 grinding chamber
5 longitudinal axis
6 rotor
7 shaft
8 motor
9 end face
10 first connecting connection
11 inserts
12 Measuring device
13 gas supply line
14 gas reservoir
15 measuring points
16 recovery line
17 second connection joint
18 Outer face (grind container)
19 cyclone (separator)
20 third connection connection
21 fans
22 relief valve (safety device)
23 opening (grind container)

Claims (15)

A device for high-energy or fine grinding of particles using a fluid grinding body in a closed gas atmosphere, comprising:
a grinding container (2) for receiving particles and grinding bodies having a closed housing (3) and a grinding chamber (4) located therein; and
A rotor (6) rotatably supported in the grinding container (2) and for accelerating the grinding body during the grinding process
including,
The device comprises a measuring device (12) for measuring the size of the particles,
The grinding container ( 2 ) has at least one connecting connection ( 10 , 17 , 20 ) for connection with the measuring device ( 12 ), the measuring device ( 12 ) being removed from the grinding chamber ( 4 ) during the grinding process. connected to the grinding container (2) so that the particles can be removed and the size of the particles can be determined,
The grinding container (2) is formed in a cylindrical shape and extends along a horizontal longitudinal axis (5),
The measuring device 12 is connected to a gas supply line 13 and supplies gas from the gas supply line 13 through the connecting connection 10 into the grinding chamber 4 in a first switched state during the grinding process. A device, characterized in that it is configured to guide the flow. The measuring device (12) according to claim 1, wherein the measuring device (12) also, in a second switching state, for drawing a gas removal flow from the grinding chamber (4) together with the particles contained therein and for measuring the particles Device, characterized in that it is configured to create a negative pressure by means of a gas supply stream flowing from said gas supply line (13) for conveying in the direction of the device (12). 3. The grinding container (2) according to any one of the preceding claims, wherein the grinding container (2) has two end faces (9) facing each other, the end faces (9) each having a longitudinal axis (5) of the grinding container (2) ), the connecting connection (10) being arranged on one of the end faces (9) and positioned in an imaginary line extending radially and horizontally from the longitudinal axis device to do. Device according to claim 1 or 2, characterized in that the connecting connection (10) has one circular passage with a diameter of 0.1 mm to 5 mm. 3. The device (1) according to claim 1 or 2, wherein the device (1) recovers the gas removal stream removed from the crushing chamber (4) and the particles contained therein from the measuring device (12) into the crushing chamber (4). Device characterized in that it comprises a return line (16) for Device according to claim 5, characterized in that the return line (16) comprises a fan (21), which conveys the degassing stream and the particles contained therein into the grinding chamber (4). 6. The method of claim 5, wherein the recovery line (16) comprises a separator (19) for separating particles contained in the degassing stream, the separated particles being recovered into the grinding chamber (4) separately from the degassing stream. Device characterized in that it becomes. Device according to one of the preceding claims, characterized in that an overpressure can be supplied to the grinding chamber (4). 3. The device according to claim 1 or 2, wherein the device comprises a safety device (23), which safety device is configured to prevent the pressure inside the grinding chamber (4) from exceeding a predetermined threshold, whereby Device characterized in that the pressure inside the grinding chamber (4) is kept constant. A method for high-energy or fine grinding of particles using a flowable grinding body in an apparatus according to claim 1, comprising:
(a) driving a rotor (6) for accelerating the grinding body in the grinding chamber (4);
(b) removing particles from the grinding chamber (4) through the connecting connection (10) during the grinding process;
(c) measuring the size of the particles by means of a measuring device (12);
(d) performing steps (a) to (c) until a predetermined size of the particles is achieved;
How to include. 11. Method according to claim 10, characterized in that, except during steps (b) and (c), the gas supply flow flows from the gas supply line through the connecting connection (10) into the grinding chamber (4). Method according to claim 10 or 11, characterized in that the measuring device (12) is switched to the first switching state except during steps (b) and (c). 12. The method according to claim 10 or 11, wherein the removal of particles in step (b) is effected by switching of the measuring device (12) to a second switching state, in which the gas removal flow is directed therein. The gas supply stream flowing from the gas supply line 13 forms a negative pressure for drawing from the grinding chamber 4 together with the contained particles and for carrying them in the direction of the measuring device 12 for measurement of the particles. A method characterized in that. Method according to claim 10 or 11, characterized in that after step (c), the measured particles are withdrawn into the grinding chamber (4). delete

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