EP1080786B1 - Method, device and system for fluidised-bed jet mill - Google Patents

Description

In fluidized bed milling, a flow of a fluid and solid particles suspended in the fluid is generated in a fluidized bed such that the solid particles are comminuted by energy exchange. Part of the flow of solid particles below a certain mass or weight is branched off in a classifier and subjected to further processing, e.g. supplied in a filter, while solid particles remain above the aforementioned limit in the residual flow and the fluidized bed grinding are fed again until their mass or their weight is below the limit.

In fluidized bed jet milling, fluid bed flow is promoted by fluid jets that are introduced into the fluidized bed at high energy, causing the solid particles in the fluidized bed to undergo increased energy exchange. This effect is particularly well achieved, even if the high-energy fluid jets are a suspension of fluid and solid particles, optionally the fluidized bed were removed, have experienced an increase in energy and then returned with their increased energy in the fluidized bed.

In order to implement this principle particularly well in practice, several measures have already been proposed.

One of these proposals is based on the recognition that the high-energy gas jets on entry into the fluidized bed absorb solid particles from the fluidized bed and thus a particle separation takes place within the high-energy fluid jets, this particle separation is particularly effective when in the high-energy gas jets effect the particle distribution is taken, that the particles are distributed as evenly as possible over the beam cross-section.

In all these solutions was not aware of the fact that the high-energy fluid jets on entry into the fluidized bed not only cause an exchange of energy between solid particles of the fluidized bed and / or the high-energy fluid jets, but that this energy exchange only from a certain distance from the penetration of high-energy Radiation into the fluidized bed begins because the high-energy fluid jets initially displace at least the solid particles into the fluidized bed as relatively laminar flows before a turbulence occurs which leads to the desired energy exchange.

From the publication DE 20 40 519 For example, a fluid bed jet mill is known that includes an agitator that repeatedly delivers particles to the jet. For this purpose, the agitator rotates on a vertical axis and thus pushes particles from a bed of good into the jets, as in claim 16 of the published patent application DE 20 40 519 is specified. This particles are indeed returned to the rays, but it is achieved by far no optimal energy exchange of the particles to be separated solid particles.

The invention aims to improve the energy exchange of the solid particles to be separated.

This object is achieved with a method for fluidized bed grinding according to claim 1 and with an apparatus for carrying out this method according to claim 4 and with a system comprising such a device according to claim 13.

The core of the invention for achieving the goal is, firstly, that centrifugal forces are exerted on the solid particles in the region of the penetration of the high-energy fluid jets into the fluidized bed in such a way that the energy exchange between the solid particles, which become parts of the high-energy fluid jets, already begins immediately after the penetration of the high-energy radiation into the fluidized bed and on the other hand generally the concentration of the solid particles within the fluid jets is improved. This is inventively achieved in that a housing surrounding the fluidized bed for generating centrifugal forces rotates about an axis, so that the centrifugal forces act on the fluidized bed in the region of at least one fluid jet entering the fluidized bed in the energy. The present invention thus shows ways in which the high-energy fluid jets with high energy can be introduced into the fluidized bed and thereby prevents the solid particles to be separated are first displaced into the fluidized bed without significant energy exchange.

Both the apparatus conditions as well as the functions and the effects of the embodiments according to the invention differ fundamentally from that of the published patent application DE 20 40 519 previously known agitator, which pushes particles from a bed of good in the rays. According to the invention, in contrast to this prior art, the fluidized bed solids particles are held in the fluidized bed in the area of the entry of high-energy fluid jets in spite of the high-energy introduced into the fluidized bed, so that the energy exchange between solid particles in the fluidized bed reliably already takes place very intensively in the immediate area of entry of the high-energy fluid jets into the fluidized bed.

Fig. 1

als Mittellängsschnitt eine als solche bekannte Fließbettstrahlmühle in einer Ausbildung gemäß der Erfindung;

Fig. 2

ebenfalls als Mittellängsschnitt eine bereits von Anfang an erfindungsgemäß ausgebildete Fließbettstrahlmühle;

Fig.3 bis 5

jeweils als Mittellängsschnitte andere bereits von Anfang an erfindungsgemäß ausgebildete Fließbettstrahlmühlen und

Fig. 6

mit den Teilfiguren 6a und 6b Diagramme zur Erläuterung der Funktionsweise der Erfindung in einer Ausführungsform, wie sie in den einen Hälften von Fig. 4 und Fig. 5 dargestellt ist.

The invention will be explained in more detail with reference to the drawing, in which, however, only embodiments are shown, which do not represent a limitation of the essential features of the invention, as they result from the claims. In the drawing show:

Fig. 1

as a central longitudinal section known as such a fluidized bed jet mill in an embodiment according to the invention;

Fig. 2

likewise as a central longitudinal section, a fluidized-bed jet mill designed according to the invention from the very beginning;

3 to 5

in each case as a central longitudinal section other already from the beginning inventively designed fluidized bed jet mills and

Fig. 6

with the sub-figures 6a and 6b diagrams for explaining the operation of the invention in an embodiment, as in the one halves of Fig. 4 and Fig. 5 is shown.

The Fig. 1 illustrates a hot-steam fluid bed jet mill, as known in the art. A cylindrical housing 1 encloses a chamber 2, which receives the fluidized bed 3 in the lower region and is the actual grinding chamber. This fluidized bed 3 consists of fluid particles in a fluid, which are suspended more or less evenly distributed in the fluid. They have different masses and should be ground evenly to the finest particles. For this purpose, by two diametrically opposite jet nozzles 4, 5 high-energy fluid jets 6, 7 injected, which pass through the fluidized bed 3, and that solid particles collide and are decomposed by the energy exchange. The particles remain so long in the fluidized bed and in particular in the range of energetically entering the fluidized bed fluid jets 6, 7 until their mass has become so low that they of the upwardly directed beam 8 - the sum of the colliding and thereby the energy exchange between solid particles conveying individual energy beams into the fluidized bed 3 entering individual jets 6, 7 - are entrained, while the not yet correspondingly finely ground solid particles in the field of individual jets, ie remain in the actual fluidized bed 3 and further decomposed by energy exchange. In the upper region of the chamber 2 or of the housing 1 there is now a fine-material outlet chamber 9, to which in turn the fine-material outlet nozzle 10 led out of the housing 1 adjoins. The fine material particles leaving the mill through the outlet nozzle and suspended in a part of the fluid are sent for further processing, for example in a filter in which particles and fluid are separated from one another.

The ground material passes through a Mahlguteinlassstutzen 11 in the lid of the housing in the mill. With 12 is a steam supply for the rinsing rinsing between the stationary arranged in the housing 1 Feingutaustritsskammer 9 and a rotatably mounted classifying wheel 13 is referred to. By using the centrifugal force prevailing in it, optionally between the blades in the case of a bladed classifying wheel, the classifying wheel 13 causes only very finely ground material to reach the outlet connector 10, while the material is not quite as finely grounded and exploits gravity as the original millbase gets into the fluidized bed 3 and is further decomposed there. The drive 14 of the classifying wheel 13 is mounted outside of the housing 1 on the lid and functionally connected to the classifying wheel 13 through the housing cover.

In such a known fluidized bed jet mill has now been observed that in the region of the jet nozzles 4, 5, which may be arranged in several pairs with two diametrically opposed individual nozzles for high-energy introduction of diametrically opposed jets in the fluidized bed, solid particles in a rather laminar Be entrained initial flow until at some distance from the nozzles takes place the swirling and an effective exchange of energy between the particles. This is perceived as a drawback because the area of the more laminar flow rather than the grinding area is lost as it were. This is now avoided with the invention and the entrainment of the particles in front of the nozzle outlets without energy exchange between them is hindered or in other words the solid particles are held in the area of the nozzle outlets in spite of the high energy entering the fluidized bed and the grinding process begins immediately after Outlet of the high-energy fluid jets, with a certain turbulence is already not only acceptable in the nozzle area, but even desirable, because so the energy exchange between the particles if not even triggered, so at least favors and the rays immediately after exiting the nozzles in are particularly high energy.

The described desired effect is now applied according to the invention in that the particles are exposed on the one hand to the flow energy directed radially inward into the grinding chamber, as described, but on the other hand also to an oppositely acting centrifugal force, whereby centripetal forces on the one hand (jet outlet jets) and centrifugal forces (centrifugal force) be coordinated so that already in the nozzle area the degree of optimal particle separation is present. As can readily be understood, this situation, in addition to a number of functional advantages, can have the constructive advantage that the mill has a smaller Diameter than a stationary mill may have, because the grinding range starts closer to the wall or the diameter can be maintained and the efficient grinding takes place in a larger diameter range.

In this state of knowledge, the invention in the fluidized bed jet mill according to the Fig. 1 be implemented by maintaining the rotation of the classifying wheel 13 with respect to the mill housing 1, the mill is brought in its entirety to rotate about its longitudinal axis. The mill housing 1 is mounted at its upper and its lower end in suitable bearings 15, 16 and it is the mill housing 1 associated with a rotary drive 17, so that the mill is rotated by its drive at such a rotational speed or peripheral speed in that characterized in the fluidized bed by arrows and by the reference numeral 18, the inwardly directed jet forces counteracting centrifugal force and the transfugal and transpedalen energies are balanced against each other so that an energy exchange between solid particles of the fluidized bed and optionally the energy beams 6, 7 in the areas takes place immediately before the grinding nozzles.

In order to bring the crude product through the inlet port 11 and the high-energy fluid jets 6, 7 and any other high-energy fluid jets to penetrate into the fluidized bed 3 in the mill and bring out the finely ground material to be ground through the outlet port 10 from the mill, the nozzle 4, 5 and 11 ring chambers upstream and the nozzle 10 must be followed by an annular chamber, wherein in each case a part of the chamber wall of the mill must be associated mitdrehend and another part of the chamber wall must be stationary, both chamber wall parts are sealed from each other.

While it is in the mill according to the Fig. 1 is a known, originally fixed fluidized bed jet mill, which has been redesigned according to the invention by bringing the housing 1 to rotate about its longitudinal axis 1a is the fluidized bed jet mill according to Fig. 2 designed according to the invention from the outset.

An essential part is a rotor or housing 2.1 made of an inner casing 2.2 and an outer casing 2.3. The inner housing 2.2 and the outer housing 2.3 are rotatably connected to each other, which is indicated by weld beads 2.4. The inner casing 2.2 and the outer casing 2.3 are mutually associated substantially cylindrical parts, that between them a fluid-tight annular chamber 2.5 is formed and the inner casing 2.2 encloses a grinding chamber 2.6. An approximately frustoconical cover plate 2.7 of the inner housing 2.2 is penetrated by a Mahlguteinlassrohr 2.8, so that the suspension of carrier fluid and suspended therein solid particles passes through the Mahlguteinlassrohr 2.8 into the grinding chamber 2.6, in which the solid particles are subjected to the grinding process. A second cover plate 2.9 is opposite to the first cover plate 2.7 and is interspersed by a fine material outlet 2.10, so that suspended by the Feingutauslassrohr 2.10 the suspension of carrier fluid and suspended therein, ground to the desired low mass solid particles, ie the ground to a desired degree of fineness of the product Milling chamber 2.6 discharged and can be fed to further processing. The cover plates 2.7 and 2.9 are inclined relative to each other so that they are connected at their larger, equal circumference with the cylindrical peripheral wall 2.11 of the inner housing 2.2 and so assigned to each other that the Mahlguteinlassrohr 2.8 and the fine material outlet 2.10 are assigned to each other coaxially, before the Mahlguteinlassrohr 2.8 and the fine-material outlet pipe 2.10 is arranged in each case a traffic cone 2.12 or 2.13, of which the inlet cone 2.8 associated cone 2.12 brings the entering into the grinding chamber 2.6 regrind in the region of the cylindrical peripheral wall 2.11 or supports this flow during the Feingutauslassrohr 2.10 assigned Traffic cone 2.13 from the edge of the Feingutauslassrohres 2.10 so funnel-shaped expanded that he defines together with the traffic cone 2.12 a well-circumscribed Mahlkammerkernbbereich between inlet pipe 2.8 and outlet 2.10. In the cylindrical peripheral wall 2.11, at least two jet nozzles 2.14 and 2.15 are now held in pairs opposite each other in such a way that through them grinding jets 2.16 and 2.17 penetrate into the fluidized bed forming during the operation of the device, in particular in the core region of the grinding chamber 2.6. The grinding jets 2.16 and 2.17 fluidize the suspension in a fluidized bed, solid particles collide and are decomposed by energy exchange, whereby the fluidized bed jet milling is given.

The formation of the grinding jets 2.16 and 2.17 is carried out by fluid, which is conveyed through the jet nozzles 2.14 and 2.15, after it has been removed from the annular chamber 2.5. The supply of high-energy fluid in the up to the jet nozzles 2.14 and 2.15 closed annular chamber 2.5 takes place from a source of pressurized fluid through a concentrically surrounding the Mahlguteinlassrohr 2.8 inlet nozzle 2.18.

The entire system described is now rotatably mounted in bearings 2.19 and 2.20 around the axis of symmetry 2.21, so that during operation of the system, a centrifugal force counter to the injection directions of the grinding jets 2.16 and 2.17 is formed. The drive of the system is not essential to the invention and therefore assumed to be known and not shown in detail accordingly. What is important is a relation between the energy of the grinding jets 2.16 and 2.17 on the one hand and the centrifugal force 2.22 on the other hand such that the particles to be crushed are held as close as possible to the jet nozzles 2.14 and 2.15 in order to achieve such a low mass in the grinding chamber and its entirety, that they are conveyed by the grinding jets in the area of the beginning of the fines outlet tube 2.10 and by a suitable suction device (as usual and known and therefore not closer shown) are sucked through the Feingutauslassrohr 2.10.

In the Fig. 3 is a variant of the device according to the Fig. 2 represented, which differs from the embodiment according to the Fig. 2 differs in that instead of storage on both sides of the mill in the camps 2.19 and 2.20, the mill is cantilevered by the nozzle 3.18 (analogous to the nozzle 2.18 in the Fig. 2 ) is rotatably mounted in the two axially staggered bearings 3.19 and 3.20.

At the side of the mill and the two bearings 3.19 and 3.20, a drive 3.23 acts on the inlet port 3.18. Between the two bearings 3.19, 3.20, a feeder 3.24 is arranged by means of the pressurized fluid into the annular space between inlet pipe 3.18 and Mahlguteinlassrohr 3.8 and from this into the annular chamber 3.5 passes. Otherwise, the mill is the Fig. 3 the mill of Fig. 2 Accordingly, and in both cases, the operation is essentially the same. Same parts are therefore in both Figures 2 and 3 denoted by the same numbers behind the figure hint 2 and 3, respectively. Due to the floating bearing with the two bearings 3.19 and 3.20 there is a greater degree of freedom in the utilization of the space on the other side of the mill. At the free end of the Feingutauslassrohres 3.10 is followed by an air classifier 3.25, which has as an essential sight a radially from outside to inside flowed bladed classifying wheel 3.26 in a housing 3.27. The fines to be viewed come from the mill into the housing 3.27 so that it reaches the radially outer ends of the flow channels between the blades of the classifier wheel 3.26. The relative fines pass from the inner ends of the blade channels into the centrally located fines discharge 3.28 in order to leave the housing 3.27 through them. The relatively coarser Sichtgut is rejected at the outer ends of the blade channels and falls down into the funnel-shaped part 3.27a of the housing 3.27, from where it via a line 3.29 the mill to be supplied coarse material is mixed and is subjected to a repeated grinding process.

The mill and classifier according to the Fig. 4 similar to the bottom part of the plant essentially according to the Fig. 3 , which is expressed by the fact that the same reference numerals are used behind the pointing to the figures guide number 3 or 4 for the same parts and why a detailed description is omitted.

The Indian Fig. 3 The mill downstream wind sifter is in the execution of the Fig. 4 integrated as an internal device in the mill. In the grinding chamber 4.6 is on the inner end of the projecting into the grinding chamber 4.6 fines outlet 4.10 the radially from outside to flow through, bladed classifying wheel 4.13 mounted rotatably. The milled material reaches the outer ends of the blade channels and passes particles below a predetermined mass limit into the fines outlet port 4.10 to exit the mill and sifter, while coarser particles above that bulk boundary are rejected and subjected to a further refining operation. While in the previous solutions of the fine material outlet was firmly connected to the mill housing and was rotatable with this, is in the solution according to the Fig. 4 the fines outlet 4.10 firmly connected to the classifying wheel 4.13 and rotatably mounted in bearings 4.30 to 4.31 in the assembly of inner casing 4.2 and outer casing 4.3, so that the classifying wheel 4.13 with the optimal speed for the sighting relative to the assembly or the housing 4.1 from inner casing 4.2 and outer housing 4.3 can be operated. The drive acts on the fines outlet 4.10 and on this on the classifying wheel 4.13. As far as the grinding nozzles are concerned, the embodiment below the center line 4.21 resembles the previously described embodiments.

In the embodiment above the center line 4.21, the grinding nozzles 4.14 and 4.15 are installed so that the high-energy grinding jets 4.16 and 4.17 are injected parallel to the axis of rotation 4.21 of the system, so that the centrifugal forces act laterally on the fluidized bed in the grinding chamber and its solid particles in the range between Push the grinding nozzles into the grinding jets.

While in the two embodiment according to the Fig. 4 the Mahlgutaufgabe takes place in the axial direction at one outer end of the inlet tube 4.8 and the exit of the fine material through the fines outlet 4.10, which is also axially and coaxially arranged to the inlet pipe 4.8 on the other side of the mill housing 4.2, 4.9, carried out in the embodiments according to the Fig. 5 the grinding material feed 5.11 and the fine material outlet 5.10 on the same side of the mill housing 5.1. Otherwise the plant resembles according to the Fig. 5 the plant according to the Fig. 4 , which is expressed by the reference numerals, in turn, the embodiment below the centerline belonging to the axis 5.21 the embodiments according to the FIGS. 1 to 3 while the embodiment above the center line is similar to the embodiment shown in FIG Fig. 4 is shown above the center line 4.21, ie, the centrifugal force supports the introduction of solid particles from the fluidized bed in the grinding jets.

It is essential in the embodiments according to the FIGS. 1 to 3 and 4 and 5 above the center line or axis of rotation, that the milled streams are directed radially inwardly into the fluidized bed and act on the to be ground and to be seen solid particles due to centrifugal force a counter force.

So they show that Fig. 4 and the Fig. 5 in their below the rotation axis / center line 4.21 or 5.21 lying parts corresponding to the preceding embodiments embodiments in which by means of an accelerating nozzle 4.14 or 5.14, as one of two nozzles forming a pair of nozzles and diametrically opposed nozzles, a high-flow fluid jet 4.6 or 5.6 for penetrating perpendicular to the axis of rotation in the fluidized bed 4.3 or 5.3 is induced to suck particles from the fluidized bed, which are decomposed by energy exchange, especially in the fluid jet wherein a centrifugal force due to the rotation of the mill about the axis of rotation / centerline 4.21 and / or 5.21 keeps the particles in the immediate vicinity of the nozzle outlet so as to act on the concentration of particles in the jet. In addition, the show Fig. 4 and the Fig. 5 in their lying above the axis of rotation / center line 4.21 and 5.21 parts other embodiments in which the centrifugal force is applied in another way to affect the particle distribution in the beam. The centrifugal force supports the suction of the particles from the fluidized bed into the flow-energy-rich fluid jet over the entire jet length in that the suction effect and the centrifugal force are directed in the same direction to the jet center line and consequently more particles enter the grinding jet than through the flow energy of the grinding jet alone or the prevailing in the grinding jet vacuum happens, as is the case with conventional jet mills with non-rotating mill housing.

The effect of the rotation of the mill according to the invention or of the centrifugal force that forms as a result can be the Fig. 6 taken with the sub-figures 6A and 6B. From the Fig. 6A can be seen as the hydrostatic or quasi-hydrostatic pressure (corresponding to gas or liquid as fluid), represented by the arrows 6.P, over the length of 6.L the grinding jet 6.6, the longitudinal axis of 6.61 with the axis of rotation 6.21 of the mill in the presentation of the Fig. 6A encloses a right angle, radially increases from the inside to the outside and in the region of the outlet of the nozzle is the largest 6.4. The hydrostatic pressure resulting from the centrifugal force, which promotes the suction effect for the particles in the grinding jet, is therefore greatest at the nozzle outlet, ie, in a region in which, according to the state of the art, none are exiting The fluidized bed sucked particles are present in larger numbers. The hydrostatic pressure thus supremely pushes particles into the grinding jet.

The resulting in turn, for the grinding process optimal pressure curve in the grinding jet results from the Fig. 6B .6.P1 is the pressure of the material to be ground in front of the nozzle, 6.P2 the pressure curve under the effect of centrifugal force, 6.P3 the pressure curve without the influence of centrifugal force in the diagram, in which the radius r is plotted against the pressure P.

Claims (13)

1. A method for fluidized-bed jet milling of a particle shaped milling material suspended in a fluid, using at least one fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) penetrating into the fluidized-bed (3) with high energy, and applying a centrifugal force (18; 2.22) to the particles in the area of the at least one fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) for influencing the particle concentration in the area of the at least one fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) penetrating into the fluidized-bed with high energy, characterized in that a housing (1; 2.1; 3.1; 4.1; 5.1) enclosing the fluidized-bed (3) is rotating about its longitudinal axis (1a; 2.21; 4.21; 5.21) in order to generate the centrifugal force (18; 2.22) so that the centrifugal force (18; 2.22) is acting upon the fluidized-bed (3) in the area of the at least one fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) penetrating into the fluidized-bed (3) with high energy.
2. A method according to claim 1, characterized in that the centrifugal force (18; 2.22) is brought to effect perpendicularly to the jet direction in order to support the suction effect of the jet upon solid particles of the fluidized-bed (3) in the area surrounding the jet over the entire length through the back pressure caused by the centrifugal force (18; 2.22).
3. A method according to claim 1, characterized in that the centrifugal force (18; 2.22) is opposed to the direction of the fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) in order to cause a gradient of the particle concentration along the direction of the jet, wherein the highest concentration preferably occurs directly in the area of the jet entry.
4. A device for performing the method according to one the preceding claims, wherein the fluidized-bed (3) is enclosed by a housing (1; 2.1; 3.1; 4.1; 5.1),
   characterized
   in that the housing rotates about an axis (1 a; 2.21; 4.21; 5.21) in order to generate a centrifugal force (18; 2.22) acting upon the fluidized-bed (3) in the area of the at least one fluid jet (6, 7; 2.16, 2.17; 3.16, 3.17) entering into the fluidized-bed (3) with high energy, and
   in that the at least one fluid jet (2.26, 2.17) is caused to penetrate into the fluidized-bed (3) perpendicular to the axis (2.21; 4.21; 5.21) of the centrifugal force (18; 2.22) or opposite to the centrifugal force (18; 2.22).
5. A device according to claim 4, characterized in that the rotating housing (2.1) is an inner housing (2.2), which is surrounded by an outer housing (2.3), wherein a positive pressure is generated and maintained during operation in a portion (2.5) between the inner housing (2.2) and the outer housing (2.3), which positive pressure suffices to feed the at least one high energy fluid jet (2.16, 2.17) entering the inner housing (2.2) with high energy.
6. A device according to claim 4 or 5, characterized in that the inner housing (2.2) and the outer housing (2.3) are rotationally fixated relative to each other.
7. A device according to claim 5 or 6, characterized in that the cylindrical outer housing (2.3) is provided in a cover plate with a concentric inlet spout (2.18), through which the medium of the at least one fluid jet (2.16, 2.17) entering into the inner housing (2.2) with high energy gets into the area between the two housings (2.2, 2.3).
8. A device according to claim 7, characterized in that in the inlet spout (2.18) an inlet tube (2.8) is concentrically disposed, through which the material to be milled gets into the milling chamber (2.6), which is enclosed by the inner housing (2.2).
9. A device according to claims 7 and 8, characterized in that an outlet spout (2.10) for the milled material is coaxially disposed in an outlet side cover plate of the outer housing (2.3), which cover plate is disposed opposite to said first cover plate of the outer housing (2.3).
10. A device according to one of the claims 8 or 9, characterized in that inside the milling chamber (2.6) at the milling chamber side outlet opening of the milling material inlet tube (2.8) a guide device (2.12) is disposed, through which the milling material getting into the milling chamber (2.6) gets into the area of the at least one fluid jet (2.16, 2.17) led into the milling chamber (2.6) with high energy, which forms a milling jet.
11. A device according to claim 9, characterized in that before the milling chamber side inlet opening of the outlet spout (2.10) a guide device (2.13) for the milled material is arranged, which facilitates moving the milling material determined to exit from the milling chamber (2.6), into the area of the inlet opening (2.10).
12. A system with a device according to one of the claims 4 through 11 for performing the method according to one of the claims 1 through 3, wherein the milled material is fed to a separator (3.25; 4.13) having a predetermined separation limit, wherein the coarser material, which is below said limit, is fed again to the milling material to be fed to the fluidized-bed jet mill, and the fine material lying above said limit is fed for further processing, e.g. in a filter.
13. A system according to claim 12, wherein the separator is an air separator, which is physically separate from the mill, but functionally operating together with it, or an air separator (4.13), which is physically integrated into the mill.

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