EP4452504A1 - Dispositif et procédé de broyage et de mélange sans contact de poudres comportant une enveloppe interne tournante - Google Patents
Dispositif et procédé de broyage et de mélange sans contact de poudres comportant une enveloppe interne tournanteInfo
- Publication number
- EP4452504A1 EP4452504A1 EP22840254.1A EP22840254A EP4452504A1 EP 4452504 A1 EP4452504 A1 EP 4452504A1 EP 22840254 A EP22840254 A EP 22840254A EP 4452504 A1 EP4452504 A1 EP 4452504A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- mixing
- protective casing
- internal protective
- powders
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/1815—Cooling or heating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/24—Driving mechanisms
Definitions
- the present invention relates to the field of the grinding of powders, in particular the cryogenic grinding of powders, in particular in the liquid phase, to obtain submicronic, even nanometric particles, while limiting the impurities.
- the invention preferably finds its application for any process and for any factory or industry implementing operations of mixing and/or grinding of powders, in particular of micronization of granular media with the aim in particular of obtaining improved performance in terms of specific energy applied and/or mixing or grinding time and/or in terms of the ability to grind difficult to grind materials.
- the invention thus proposes a grinding and mixing device, preferably cryogenic, without contact of powders comprising an internal rotating protective casing located inside a grinding tank, as well as a grinding and mixing process associated , preferentially cryogenic.
- crushers are used which can be very different depending on the charges to be crushed and their capacity for fragmentation, such as, for example, knife, flail, hammer, roller, ball, jet crushers. air, among others.
- micronization of powders to be ground is often complicated to optimize for targets with a particle size of less than one micron and for materials known to be difficult to grind.
- the micronization means are inefficient, implementing speeds limited to a critical speed, which leads to the materials being treated for several hours, or even several days, to achieve the desired particle sizes, in fact inducing pollution of the charges to be ground.
- the useful volume of micronizers is often weak and mills aimed at submicron are little or not extrapolable to industrial scales.
- a means is desired for effectively applying energy to a powder in order to be able to grind it finely, this powder being preferentially suspended in a liquefied gas.
- the increase in agitation energy (allowing efficient operations to be carried out in terms of particle size or treatment time, for example) requires an increase in the speed of the agitation rotor of the mill, it concomitantly produces increased wear of the internals of the grinder to the right of which the differential speed per king / bi-Island grinding and / or grinding powder is the most important.
- the object of the invention is to at least partially remedy the needs mentioned above and the drawbacks relating to the embodiments of the prior art.
- the subject of the invention is a device for grinding and mixing, in particular grinding and cryogenic mixing, of powders, characterized in that it comprises:
- a grinding tank comprising the load of powders to be ground, in particular in the liquid phase, and grinding media,
- the grinding and mixing device according to the invention may further comprise one or more of the following characteristics taken individually or in any possible technical combination.
- the grinding and mixing device according to the invention is advantageously a grinding and cryogenic mixing device, the grinding vessel comprising a cryogenic fluid, in particular liquid nitrogen, and being in particular insulated, for example by means of insulation of predetermined thickness.
- the grinding vessel is advantageously in the form of a tank providing thermal insulation, being in particular in the form of a double vacuum envelope, and allows the reception of the internal protective envelope.
- the grinding tank is advantageously made of a non-magnetizable material, for example stainless steel, in particular of the 316L type.
- the internal volume of the internal protective casing can advantageously include the grinding media.
- the internal protective casing advantageously has a geometry similar to that of the grinding vessel, being of smaller size so as to fit into the grinding vessel.
- the grinding and mixing mobile can be driven in rotation by means of a motorization system with transmission arm.
- the grinding and mixing mobile can thus transmit the mechanical power delivered by the motorization to the fluid to be ground in the form of convective movements by agitation with circular motion.
- the permanent magnets can be inserted into the inner shroud or placed between the inner shroud and the grinding vessel.
- the drive magnets may comprise fixed alternating drive electromagnets, without rotational drive, placed outside the grinding vessel.
- the drive magnets can also comprise mobile drive magnets, driven in rotation by means of a drive motor.
- the internal protective casing may consist of or may comprise a coating in a material of greater hardness than that of the powders to be ground, in particular under cryogenic temperature conditions, and which sublimates at ambient temperature and atmospheric pressure.
- the internal protective casing may in particular consist of or may include a coating of solidified carbon dioxide.
- Solidified carbon dioxide can be obtained by solidification of liquid carbon dioxide by cooling or by compaction of dry ice or by machining.
- the internal protective envelope may for example comprise elements in relief of attrition on its internal wall, in particular attrition pawns, comprising in particular solidified carbon dioxide.
- the elements in relief of attrition, or else of grinding, can be obtained by solidification of liquid carbon dioxide by cooling or by compaction of dry ice or by machining.
- the permanent magnets and drive magnets can be arranged axisymmetric with respect to the axis of rotation of the grinding vessel.
- the permanent magnets can be arranged by crimping and/or by forcing.
- another subject of the invention is a process for grinding and mixing, in particular grinding and cryogenic mixing, of powders, characterized in that it is implemented by means of a device as defined previously.
- the method can advantageously be implemented by means of a grinding and cryogenic mixing device using a cryogenic fluid in the grinding vessel, in particular liquid nitrogen, in direct contact with the powders to be ground.
- the method may include the step of rotating the internal protective casing by means of stationary alternating drive electromagnets powered according to the distance between permanent magnets and electromagnets.
- the method may also include the step of rotating the inner protective casing by means of mobile drive magnets rotated by means of a drive motor.
- the rotation of the movable drive magnets can advantageously be carried out so that the direction of rotation varies alternately. In this way, it may be possible to increase the grinding efficiency.
- the grinding and mixing device and method according to the invention may include any of the characteristics stated in the description, taken in isolation or according to any technically possible combination with other characteristics.
- FIG. 1 schematically illustrates, in a sectional view, an example of a grinding and mixing device according to the invention with a first driving principle of the internal protective casing
- FIG. 2 schematically illustrates, in a sectional view, the example of a grinding and mixing device according to the invention of Figure 1 with a second driving principle of the internal protective envelope
- FIG. 5 shows, in a view partially in section and in perspective, an example of a grinding and mixing device according to the invention
- FIG. 6 shows, in a partial perspective view, the grinding and mixing device of Figure 5
- FIG. 7 shows, partially in section, the grinding and mixing device of Figure 5.
- FIG. 1 there is shown an example of a grinding and mixing device 1 according to the invention with a first drive mode of the inner protective casing.
- FIG. 2 represents the same grinding and mixing device 1 with a second mode of driving the internal protective casing.
- the grinding and mixing device 1 is preferably a grinding and cryogenic mixing device. It advantageously allows the grinding and micronization of powders using a drive wall without contact so as to be able to limit the introduction of impurities, in particular by abrasion and wear of the internals of the grinding and mixing device.
- the grinding and mixing device 1 firstly comprises a grinding tank 2.
- the grinding tank 2 is in the form of a double jacket maintaining a low partial pressure (vacuum at least primary) in the interwall volume formed by the double envelope. It thus provides thermal insulation. It is advantageously made of a non-magnetizable material, for example stainless steel, in particular of the 316L type.
- the grinding tank 2 has the function of receiving the load of solid powders P to be ground and mixed in the liquid phase, in particular liquefied gas, for example liquid nitrogen.
- the grinding vessel 2 is globally of cylindrical symmetry. Its height is advantageously between 0.5 and 5 times its diameter. It can optionally comprise a drain at the low point which can be used to evacuate the load and/or to recycle it within the tank 2.
- the grinding tank 2 is designed in such a way as to accommodate an internal protective casing 3 inserted between the grinding tank 2 and the fluid to be ground, powders and liquid.
- the internal protective casing 3 comprises an internal volume Vi which may comprise grinding media Mb, for example balls, balls, among others, visible in FIGS. 1 and 2. It advantageously has a geometry similar to that of the tank grinding 2, being of smaller size so as to fit into the grinding tank 2.
- the internal protective casing 3 consists mainly of solidified carbon dioxide C ⁇ 2(s), ie CO2 in the compact solid state, with a density at least equal to 60% of the theoretical density. This can be obtained by solidification of dioxide of liquid carbon CO2O) by cooling or by compaction of dry ice or by machining.
- solidified carbon dioxide in contact with a liquefied gas at temperatures close to -200°C at atmospheric pressure, solidified carbon dioxide becomes a relatively hard material since it passes from a hardness close to 1.5 on the Mohs scale to a hardness close to 8 on the same scale.
- the internal protective envelope 3 comprises attrition pins 6 on its internal wall, which comprise solidified carbon dioxide C ⁇ 2 (s), obtained by solidification of liquid carbon dioxide CO2O ) by cooling or by compaction of dry ice or by machining.
- the length of the attrition pins 6 is advantageously an order of magnitude less than one sixth of the diameter of the grinding and mixing wheel set 4.
- the grinding and mixing device 1 comprises a grinding and mixing mobile 4 disposed in the internal volume Vi of the internal protective casing 3.
- the mobile grinding and mixing 4 is driven in rotation by means of a motorization system with transmission arm.
- the grinding and mixing mobile 4 can thus transmit the mechanical power delivered by the motorization to the fluid to be ground in the form of convective movements by agitation with circular motion.
- the motorization can advantageously comprise an electric motor equipped with a speed variator allowing it to be adjusted between a few tens of revolutions per minute, typically of the order of 50 revolutions/min, to a few thousand revolutions per minute, potentially up to at 10,000 or even 20,000 rpm.
- the grinding and mixing rotor 4 can be of different natures, for example of the turbine type, blades inclined or not, attrition rotor or propeller. It has a diameter of the grinding and mixing rotor such that the ratio between the diameter of the tank to the diameter of the grinding and mixing rotor is between 0.2 and 0.9.
- the grinding and mixing device 1 comprises permanent magnets 7 located at the level of the internal protective casing 3. These permanent magnets 7 are inserted into the internal protective casing 3, as shown, or alternatively placed between the internal protective casing 3 and the grinding vessel 2.
- the grinding and mixing device 1 also comprises drive magnets 8a, 8b, for the rotation, arrow R in FIGS. 3 and 4, of the internal protective casing 3 by interaction with the magnets permanent magnets 7, located outside the grinding vessel 2 opposite the permanent magnets 7.
- the drive magnets 8a, 8b comprise fixed alternating drive electromagnets 8a, without rotational drive, placed outside the grinding vessel 2.
- the drive magnets 8a, 8b comprise mobile drive magnets 8b, driven in rotation by means of a drive motor 9.
- the permanent magnets 7 and the drive magnets 8a, 8b are arranged axisymmetrically with respect to the axis of rotation X of the grinding vessel 2.
- the permanent magnets 7 can be arranged by crimping and/or by forcing.
- the grinding and mixing device 1 in accordance with the invention therefore allows both the use of an internal protective envelope 3 based on solidified carbon dioxide (CÜ2(s)) but also the rotation of this envelope 3 at angular speeds potentially equivalent to those of the grinding and mixing mobile 4.
- CÜ2(s) solidified carbon dioxide
- the internal protective casing 3 is rotated in the opposite direction to the rotation of the grinding and mixing wheel set 4.
- the speed of rotation is less than or equal to the speed of rotation of the grinding and mixing wheel set 4.
- the rotation of the internal protective casing 3 is ensured by means of the drive motor 9 and the mobile magnets 8b or by means of the alternating electromagnets 8a.
- Figures 3 and 4 illustrate the movement of the inner protective casing 3 by means of alternating electromagnets 8a.
- the electromagnets 8a are powered from the moment when, at a given time tO represented in FIG. 3, the distance between the permanent magnet 7 of the internal protective casing 3 and the electromagnet 8a becomes less than the maximum distance d m ax of magnetic influence, represented in FIG. 3. Then, from the moment, at the time t1 represented in FIG. 4, where the two normals of the magnetic surfaces (surface of the permanent magnet 7 and surface of the electromagnet 7) form a limit angle Qümite, visible in FIG. 4, tending towards zero, the power supply to the electromagnet 8a is interrupted.
- FIGS. 5, 6 and 7 partially show another example of a grinding and mixing device 1 in accordance with the invention, using drive magnets in the form of electromagnets 8a.
- the references previously described are not new here.
- the permanent magnets 7 can be located between the internal protective casing 3 and the grinding vessel 2.
- the rotation of the inner tank 2 is provided in such a way that there is a periodic and sudden change in its direction of rotation. Indeed, this type of modification of the direction of rotation induces impaction phenomena which can strongly promote micronization.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2114145A FR3130647B1 (fr) | 2021-12-21 | 2021-12-21 | Dispositif et procédé de broyage et de mélange sans contact de poudres comportant une enveloppe interne tournante |
| PCT/FR2022/052251 WO2023118679A1 (fr) | 2021-12-21 | 2022-12-05 | Dispositif et procédé de broyage et de mélange sans contact de poudres comportant une enveloppe interne tournante |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4452504A1 true EP4452504A1 (fr) | 2024-10-30 |
| EP4452504C0 EP4452504C0 (fr) | 2025-07-30 |
| EP4452504B1 EP4452504B1 (fr) | 2025-07-30 |
Family
ID=81328231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22840254.1A Active EP4452504B1 (fr) | 2021-12-21 | 2022-12-05 | Dispositif et procédé de broyage et de mélange sans contact de poudres comportant une enveloppe interne tournante |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4452504B1 (fr) |
| FR (1) | FR3130647B1 (fr) |
| WO (1) | WO2023118679A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6902699B2 (en) * | 2002-10-02 | 2005-06-07 | The Boeing Company | Method for preparing cryomilled aluminum alloys and components extruded and forged therefrom |
| FR3072308B1 (fr) | 2017-10-12 | 2019-11-15 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Dispositif et procede de broyage cryogenique avec media de broyage sous forme de gaz cryogenique solidifie |
| CN112337587B (zh) * | 2020-11-20 | 2022-01-25 | 重庆市赛特刚玉有限公司 | 一种棕刚玉球磨机 |
| CN112827584B (zh) * | 2020-12-31 | 2024-11-26 | 生态环境部南京环境科学研究所 | 一种立式高温搅拌球磨设备 |
| CN112827580B (zh) * | 2020-12-31 | 2024-11-26 | 生态环境部南京环境科学研究所 | 一种高温行星球磨设备 |
-
2021
- 2021-12-21 FR FR2114145A patent/FR3130647B1/fr active Active
-
2022
- 2022-12-05 EP EP22840254.1A patent/EP4452504B1/fr active Active
- 2022-12-05 WO PCT/FR2022/052251 patent/WO2023118679A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023118679A1 (fr) | 2023-06-29 |
| FR3130647A1 (fr) | 2023-06-23 |
| FR3130647B1 (fr) | 2023-11-10 |
| EP4452504C0 (fr) | 2025-07-30 |
| EP4452504B1 (fr) | 2025-07-30 |
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