CA1182089A - Method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method - Google Patents
Method of finely crushing particles of material in a centrifugal mill and apparatus for performing the methodInfo
- Publication number
- CA1182089A CA1182089A CA000400899A CA400899A CA1182089A CA 1182089 A CA1182089 A CA 1182089A CA 000400899 A CA000400899 A CA 000400899A CA 400899 A CA400899 A CA 400899A CA 1182089 A CA1182089 A CA 1182089A
- Authority
- CA
- Canada
- Prior art keywords
- particles
- rotor
- impact
- mill
- crushing
- 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.)
- Expired
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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
- B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
- B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
- B02C13/1814—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed on top of a disc type rotor
Abstract
ABSTRACT
A method and an apparatus for finely crushing particles of material in a centrifugal mill or the like, wherein at least one rotor projects the particles against stationary impact surfaces in the mill, the comminution taking place substantially in vacuum. To obtain fractions with very small grains (below 10 µ) with a low energy consumption the particles are accelerated in vacuum to such a high impact energy against the impact surface(s) of the rotor , that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
A method and an apparatus for finely crushing particles of material in a centrifugal mill or the like, wherein at least one rotor projects the particles against stationary impact surfaces in the mill, the comminution taking place substantially in vacuum. To obtain fractions with very small grains (below 10 µ) with a low energy consumption the particles are accelerated in vacuum to such a high impact energy against the impact surface(s) of the rotor , that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
Description
1 18~9 The present invention relates to a method of finely crushing particles of material in a centrifugal mill or the like, where in at least one rotor projects the particles against ~tationary impact surfaces in the mill, the comminution taking place substantially in vacuum.
The invention also relates to an apparatus for performing the method.
Background o~ the _nvention Mechanical comminution of solid particles may be classified according to the manner of operation of the apparatus that performes the crushing. Crushing or milling may be performed according to two main principles either with pressure that rupture~ the particles, as for instance by means of ~aw crusher3, pendulum mills, tower mills, roller mills and the like, or with kinetic energy that causes bursting of the particle~. Typical examples of the latter category are hammer mills, pin mills and jet mills.
Thcre i~ a great demand on the market for finely crushed material especially in the filler industry as fillers e.g.
in plastics and paper industry. Another large product area is finely milled quartz and feldspar for the ceramic industry. Todays technology for producing fine grained materials are very energy and cost demanding, especially when narrow tolerances in grain size and particle sizes below 30 ~u are desired. Sizes down to 45~u may be obtained with ball mills, but since the Krinding balls u~ually consi~t of iron it is not possible to obtain iron-free milling. This type of milling therefore is not useable for materials which are to be used as whitening agent3 in the paper and plastic indu~tries, since even ~mall proportions of iron de~troy~ the whitene~. In order to arrlve at particle si~e~ of 20 ~, either conventional milling and air ~k 1 ~2089 stream separation or a ~et mill is u~ed. The problem with air-separated material is that too much of too coarse fractions will be included, which i9 mostly not acceptable.
With ~et mills it is possible ~o arrive at particle Qizes around 10 ~ and even smaller but the jet mill has a low efficiency and a very high energy consumption (350~700 kWh/ton).
The amount of energy consumed in crushing by means of ~inetic energy or impact energy may be divided into three main groups, viz. energy which is consumed for elastic deformation of the grains or particles and which is lost, supplied energy which burst~ the grains, and energy for the operation of surrounding equipment etc. At low velocities, a 3ub~tantial portion of the supplied energy will be used up for the elastic deformation of the particles, which gives a low efficency. Furthermore, the elastic deformation will cause the particles to bamce instead of bursting, which will cau~e heavy wear. At high velocities, on the other hand, the cnergy consumed ~or elastic deformation amounts only to a ~mall portion of the total energy, whereas the high impact ~ner~y, lf it oan be applied as "instantaneously'l as possible, gives very high stress concentrations and provides an efficient crushing. This mean~ that a high particle velocity and instantaneous impact force should be chosen.
The ~et mill which ha~ proved to be especially suitable for cru3hing or milling into fractions with very small grains utilizes a high particle velocity and uses pressurized air for accelerating the grains to about 100 m/s, and the high velocity grains collide with other grains resulting in the grains bursting each other. However, due to the very high energy consumption per ton, low efficiency and very high production costs, the ~et mill has so far only been used in "exclu~ive" connection~, for instance in the chemical industry and the farmaceutical industry.
It has also been suggested (German patent specification 387,995) to use disintegrators or stamp mills, the milling tools of which operate in an air-void ~pace in order to X
3 ~2Q~
obtain a fine grinding, preferably together with a di3persing agent.
The ob~ect and important characteristics of the invention The ob~ect of the inYention is to provide a comparatively simple method which, while involving a low energy consumption, may provide fraction~ with very ~mall grains (below 10 ju). This obJect has been attained in that the particles are accelerated in vacuum to such a hi8h impact energy against the impact ~urface or surfaces of the rotor that a first crushing takes.place before the particles are being projected against the stationary impact surfaces of the mill.
The invention also relates to an apparatus for comminuting solid particles of material and which is characteri~ed by at least one passive or active accelerator operating in vacuum, provided opposite to the rotor and designed to impart to the partlcles such a high impact energy against the impact surface(s) of the rotor, that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
Fig. 1 i~ a diagrammatic section through a centrifugal mill according to the invention and intended for laboratory purposes.
Fig. 2 i~ a section taken on the line II-II in figo 1~
Fig. 3 is a partly broken side view of a centrifugal mill with twin rotors according to another embodiment of the invention.
Fig. 4 is a section taken on the line IV-IV in fig. 3.
Fig. 5 is a side view of a complete installation for the recirculation of the particles of material.
The centrifugal mill according to the invention conqi~ts of a housing 11 which may be sealed airtight and which contain~
a crushing chamber 12 wherein there is rotatably arranged a rotor 13 which i~ provided at each end with an impact ~ ~8~
surface 14. The rotor i3 journalled ~n a heavy bearin~ 15 and is driven by a motor 16 by means of a suitable transmission 17. Opposite to the path of movement of the impact surfaces 14 there is provided at least one supply channel 18 through which particles of material that are to be finely divided are supplied intermittently. The opening 19 of the supply channel 18 in the hou~ing 11 is provided at some distance ~rom an impact surface 20 which is oriented in such a way that it extends substantially in parallel with the rotor impact surface t4 when this is disposed below the outlet opening 19. In the embodiment shown in Figs. 1 and 2, the impact surface Z0 is disposed outside of the path of rotation of the impact surface 14. Any particles projected to the side of the impact surface 20 will be arrested by the foll.owing impact surfaces 20' and 20". Below the impact ~urface~ there is provided, in the bottom 21 of the crushing chamber, an outlet opening 22 through which the material which has been projected against the impact surfaces 14 and 20 and crushed thereby leaves the crushing chamber 12. The outlet opening 22 may be connected to a recirculation system o~ the kind illustrated in Fig. 9 which returns the p~rtlcles to the supplied channel 18. The outlet opening may alYo be connected to a feeding out device (not shown) for batchwise removal of the crushed material from the apparatu~.
By the aid of a passive or active accelerator 28, the particles of material are given a very high impact velocitv against the rotor impact surface or surfaces 14. The "passive" accelerator consists of a vertical tube 18 included in the air-void system and having such a length (for instance 3 m), that the impact velocity against the impact surface 14 of the rotor together with the rotor's own velocity will be so large, that the particles will be crushed a first time at this impact and the second time when they are projected against the stationary impact surfaces.
By the aid of a device not shown a vacuum is maintained in the accelerator 289 the cru~hing chamber 12 and spaces 1 1~2~8~
communicating therewith, so that the crushing chamber is practically air-void (the air should be evacuated to at least 90%). Thanks to thi~ arrangement the rotor 13 with the impact surface~ 14 will not provide any fan action, and interfering shock waves and uncontrolled tu~bulency is avoided. The particle~ instantaneously hit by the impact surface will be cru~hed by the impact against the surface and will be projected tangentially out of the path of movement of the rotor and against one or several stationary impact surfaces 20 where further cru~hing takes place. By means of a metering device 23 provided with a rotor 24 a suitable amount of particles of material i~ fed to the impact surfaces 14 synchronou~ly with their pas~ing of the outlet opening 19.
Practical tests with a laboratory mill has shown ~hat it is feasible to give the rotor a peripheral velocity of 180 mfs.
However, for commercial operation, the upper practical limit for the peripheral velocity of the rotor would probably be about 400 m/s. In order to accelerate one ton of particles to a velocity of 180 m/s, 4,5 kWh are consumed, and at four circulations the theoretical energy consumption would be 36 kWh/ton. To this is added the energy consumed for reclrculation and for the operation of the vacuum pump.
S1n¢e thc crushing take~ place in vacuum and at a high velocity of motion the losses will be moderate compared to current technology.
The embodiment ofFigs. 3 and 4 differs from the above-de~cribed embodiment in two important respects: two or more rotors are arrarged in parallel one above the other, and the particles are supplied to the first crushing chamber 12 with such a high cennectic energy, that a maximum amount of crushing material is supplied for each "beat". The neces~ary cennectic energy (which~ however, is only about 1/10 of the rotational energy of the impact surface) is obtained by mean~ of an "active" accelerator 28 which, a~ an example, may consists of a centrifuge9 the blade~ of which are preferably rubber coated in order to reduce wear.
- S -~ ~2~
In the centrifugal mill according to this embodiment the impact surfaces 20 are preferably oriented in such a way J
that the particles will fall towards the next rotor 13a which is provided direc~ly below and close to the rotor 13.
In order to obtain a high capacity, a supply channel 18 is provided opposite ~o every other impact surface 20. The impact surfaces 20 have a ~-shaped cross-section whereby it will be possible to utilize the second leg of the V by reversing the motor. In this embodiment the two crushing chambers 12 and 12a as well as the collecting chamber 26 and the metering accelerator 28 are connected to one and the same vacuum system.
Fig. 5 shows a recirculating device for the centrifugal mill according to the invention and comprising two elevators 29 and 30, a silo 31 and a metering accelerator 28. In this ca e a practically air~void condition is maintained in the complete installation by means of a pump 32 or the like.
The invention also relates to an apparatus for performing the method.
Background o~ the _nvention Mechanical comminution of solid particles may be classified according to the manner of operation of the apparatus that performes the crushing. Crushing or milling may be performed according to two main principles either with pressure that rupture~ the particles, as for instance by means of ~aw crusher3, pendulum mills, tower mills, roller mills and the like, or with kinetic energy that causes bursting of the particle~. Typical examples of the latter category are hammer mills, pin mills and jet mills.
Thcre i~ a great demand on the market for finely crushed material especially in the filler industry as fillers e.g.
in plastics and paper industry. Another large product area is finely milled quartz and feldspar for the ceramic industry. Todays technology for producing fine grained materials are very energy and cost demanding, especially when narrow tolerances in grain size and particle sizes below 30 ~u are desired. Sizes down to 45~u may be obtained with ball mills, but since the Krinding balls u~ually consi~t of iron it is not possible to obtain iron-free milling. This type of milling therefore is not useable for materials which are to be used as whitening agent3 in the paper and plastic indu~tries, since even ~mall proportions of iron de~troy~ the whitene~. In order to arrlve at particle si~e~ of 20 ~, either conventional milling and air ~k 1 ~2089 stream separation or a ~et mill is u~ed. The problem with air-separated material is that too much of too coarse fractions will be included, which i9 mostly not acceptable.
With ~et mills it is possible ~o arrive at particle Qizes around 10 ~ and even smaller but the jet mill has a low efficiency and a very high energy consumption (350~700 kWh/ton).
The amount of energy consumed in crushing by means of ~inetic energy or impact energy may be divided into three main groups, viz. energy which is consumed for elastic deformation of the grains or particles and which is lost, supplied energy which burst~ the grains, and energy for the operation of surrounding equipment etc. At low velocities, a 3ub~tantial portion of the supplied energy will be used up for the elastic deformation of the particles, which gives a low efficency. Furthermore, the elastic deformation will cause the particles to bamce instead of bursting, which will cau~e heavy wear. At high velocities, on the other hand, the cnergy consumed ~or elastic deformation amounts only to a ~mall portion of the total energy, whereas the high impact ~ner~y, lf it oan be applied as "instantaneously'l as possible, gives very high stress concentrations and provides an efficient crushing. This mean~ that a high particle velocity and instantaneous impact force should be chosen.
The ~et mill which ha~ proved to be especially suitable for cru3hing or milling into fractions with very small grains utilizes a high particle velocity and uses pressurized air for accelerating the grains to about 100 m/s, and the high velocity grains collide with other grains resulting in the grains bursting each other. However, due to the very high energy consumption per ton, low efficiency and very high production costs, the ~et mill has so far only been used in "exclu~ive" connection~, for instance in the chemical industry and the farmaceutical industry.
It has also been suggested (German patent specification 387,995) to use disintegrators or stamp mills, the milling tools of which operate in an air-void ~pace in order to X
3 ~2Q~
obtain a fine grinding, preferably together with a di3persing agent.
The ob~ect and important characteristics of the invention The ob~ect of the inYention is to provide a comparatively simple method which, while involving a low energy consumption, may provide fraction~ with very ~mall grains (below 10 ju). This obJect has been attained in that the particles are accelerated in vacuum to such a hi8h impact energy against the impact ~urface or surfaces of the rotor that a first crushing takes.place before the particles are being projected against the stationary impact surfaces of the mill.
The invention also relates to an apparatus for comminuting solid particles of material and which is characteri~ed by at least one passive or active accelerator operating in vacuum, provided opposite to the rotor and designed to impart to the partlcles such a high impact energy against the impact surface(s) of the rotor, that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
Fig. 1 i~ a diagrammatic section through a centrifugal mill according to the invention and intended for laboratory purposes.
Fig. 2 i~ a section taken on the line II-II in figo 1~
Fig. 3 is a partly broken side view of a centrifugal mill with twin rotors according to another embodiment of the invention.
Fig. 4 is a section taken on the line IV-IV in fig. 3.
Fig. 5 is a side view of a complete installation for the recirculation of the particles of material.
The centrifugal mill according to the invention conqi~ts of a housing 11 which may be sealed airtight and which contain~
a crushing chamber 12 wherein there is rotatably arranged a rotor 13 which i~ provided at each end with an impact ~ ~8~
surface 14. The rotor i3 journalled ~n a heavy bearin~ 15 and is driven by a motor 16 by means of a suitable transmission 17. Opposite to the path of movement of the impact surfaces 14 there is provided at least one supply channel 18 through which particles of material that are to be finely divided are supplied intermittently. The opening 19 of the supply channel 18 in the hou~ing 11 is provided at some distance ~rom an impact surface 20 which is oriented in such a way that it extends substantially in parallel with the rotor impact surface t4 when this is disposed below the outlet opening 19. In the embodiment shown in Figs. 1 and 2, the impact surface Z0 is disposed outside of the path of rotation of the impact surface 14. Any particles projected to the side of the impact surface 20 will be arrested by the foll.owing impact surfaces 20' and 20". Below the impact ~urface~ there is provided, in the bottom 21 of the crushing chamber, an outlet opening 22 through which the material which has been projected against the impact surfaces 14 and 20 and crushed thereby leaves the crushing chamber 12. The outlet opening 22 may be connected to a recirculation system o~ the kind illustrated in Fig. 9 which returns the p~rtlcles to the supplied channel 18. The outlet opening may alYo be connected to a feeding out device (not shown) for batchwise removal of the crushed material from the apparatu~.
By the aid of a passive or active accelerator 28, the particles of material are given a very high impact velocitv against the rotor impact surface or surfaces 14. The "passive" accelerator consists of a vertical tube 18 included in the air-void system and having such a length (for instance 3 m), that the impact velocity against the impact surface 14 of the rotor together with the rotor's own velocity will be so large, that the particles will be crushed a first time at this impact and the second time when they are projected against the stationary impact surfaces.
By the aid of a device not shown a vacuum is maintained in the accelerator 289 the cru~hing chamber 12 and spaces 1 1~2~8~
communicating therewith, so that the crushing chamber is practically air-void (the air should be evacuated to at least 90%). Thanks to thi~ arrangement the rotor 13 with the impact surface~ 14 will not provide any fan action, and interfering shock waves and uncontrolled tu~bulency is avoided. The particle~ instantaneously hit by the impact surface will be cru~hed by the impact against the surface and will be projected tangentially out of the path of movement of the rotor and against one or several stationary impact surfaces 20 where further cru~hing takes place. By means of a metering device 23 provided with a rotor 24 a suitable amount of particles of material i~ fed to the impact surfaces 14 synchronou~ly with their pas~ing of the outlet opening 19.
Practical tests with a laboratory mill has shown ~hat it is feasible to give the rotor a peripheral velocity of 180 mfs.
However, for commercial operation, the upper practical limit for the peripheral velocity of the rotor would probably be about 400 m/s. In order to accelerate one ton of particles to a velocity of 180 m/s, 4,5 kWh are consumed, and at four circulations the theoretical energy consumption would be 36 kWh/ton. To this is added the energy consumed for reclrculation and for the operation of the vacuum pump.
S1n¢e thc crushing take~ place in vacuum and at a high velocity of motion the losses will be moderate compared to current technology.
The embodiment ofFigs. 3 and 4 differs from the above-de~cribed embodiment in two important respects: two or more rotors are arrarged in parallel one above the other, and the particles are supplied to the first crushing chamber 12 with such a high cennectic energy, that a maximum amount of crushing material is supplied for each "beat". The neces~ary cennectic energy (which~ however, is only about 1/10 of the rotational energy of the impact surface) is obtained by mean~ of an "active" accelerator 28 which, a~ an example, may consists of a centrifuge9 the blade~ of which are preferably rubber coated in order to reduce wear.
- S -~ ~2~
In the centrifugal mill according to this embodiment the impact surfaces 20 are preferably oriented in such a way J
that the particles will fall towards the next rotor 13a which is provided direc~ly below and close to the rotor 13.
In order to obtain a high capacity, a supply channel 18 is provided opposite ~o every other impact surface 20. The impact surfaces 20 have a ~-shaped cross-section whereby it will be possible to utilize the second leg of the V by reversing the motor. In this embodiment the two crushing chambers 12 and 12a as well as the collecting chamber 26 and the metering accelerator 28 are connected to one and the same vacuum system.
Fig. 5 shows a recirculating device for the centrifugal mill according to the invention and comprising two elevators 29 and 30, a silo 31 and a metering accelerator 28. In this ca e a practically air~void condition is maintained in the complete installation by means of a pump 32 or the like.
Claims (7)
PROPERTY OR PRIVILEGES IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of finely crushing particles of material in a centrifugal mill or the like, wherein at least one rotor projects the particles against stationary impact surfaces in the mill, the comminution taking place substantially in a vacuum, c h a r a c t e r i z e d i n that the particles are accelerated in vacuum to such a high impact energy against the impact surface(s) of the rotor, that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
2. A method as claimed in claim 1, c h a r a c t e r i z e d i n that the particles are supplied to the rotor from an accelerator in a measured quantity and at a point where the or each rotor impact surface is substantially parallel with the nearest following stationary impact surface in the direction of rotation of the rotor.
3. A method as claimed in claim 1 or 2, c h a r a c t e r i z e d i n that at least a portion of the particles, after having passed the crushing apparatus, is transported in vacuum via a transport system to the accelerator and the crushing apparatus.
4. An apparatus for the comminution of particles of material in a centrifugal mill or the like, and comprising at least one rotor having at least one impact surface projecting radially therefrom, stationary impact surfaces in the mill outside the path of rotation of said rotor impact surface, and means for generating a vacuum in the mill, c h a r a c t e r i z e d b y at least one passive or active accelerator operating in vacuum, provided opposite to the rotor and adapted to impart to the particles such a high impact energy against the impact surface(s) of the rotor, that a first crushing will take place before the particles are projected against the stationary impact surfaces of the mill.
5. An apparatus as claimed in claim 4, c h a r a c t e r i z e d i n that at least one metering device is provided for the controlled supply of the material to at least one position above and opposite to the path of rotation of the rotor impact surface(s).
6. An apparatus as claimed in claim 4 or 5, c h a r a c t e r i z e d i n that the "passive" accelerator consists of a vertical, air-void tube of such a length that the particles will attain, by free fall, the impact velocity necessary for their crushing.
7. An apparatus as claimed in claim 4 or 5, c h a r a c t e r i z e d i n that an "active" accelerator is connected to the inlet of the crushing chamber, said accelerator being adapted, by means of externally supplied energy, to project the particles with increased kinetic energy towards the rotor impact surface(s).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE81-023434 | 1981-04-13 | ||
| SE8102343A SE432719B (en) | 1981-04-13 | 1981-04-13 | SET FOR FINE CROSS MATERIAL PARTICLES IN A CENTRIFUGAL CROSS AND APPLICATION FOR IMPLEMENTATION OF THE SET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1182089A true CA1182089A (en) | 1985-02-05 |
Family
ID=20343579
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000400899A Expired CA1182089A (en) | 1981-04-13 | 1982-04-13 | Method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method |
| CA000589704A Expired CA1261309B (en) | 1981-04-13 | 1989-01-31 | Method of finely crushing particles of material in a centrifigual mill and apparatus for performing the method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000589704A Expired CA1261309B (en) | 1981-04-13 | 1989-01-31 | Method of finely crushing particles of material in a centrifigual mill and apparatus for performing the method |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0088762B1 (en) |
| JP (1) | JPS58500600A (en) |
| CA (2) | CA1182089A (en) |
| DE (1) | DE3265548D1 (en) |
| SE (1) | SE432719B (en) |
| WO (1) | WO1982003572A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2655880A1 (en) * | 1990-01-31 | 1991-06-21 | Framatome Sa | Centrifugal crusher with throwing under vacuum |
| WO2006122543A1 (en) * | 2005-05-18 | 2006-11-23 | Tihomir Lelas | Micronized mineral materials and their production |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE387995C (en) * | 1924-01-07 | Plauson S Forschungsinstitut G | Process for the dry crushing of solid materials down to a particle size below 0.008 mm in diameter | |
| US2609993A (en) * | 1946-04-09 | 1952-09-09 | Plaroc Inc | Impact pulverizing mill, including both cooling and vacuum means |
| FR2347102A1 (en) * | 1976-04-07 | 1977-11-04 | Planiol Rene | IMPROVEMENTS TO VACUUM CENTRIFUGAL CRUSHERS |
| US4059231A (en) * | 1976-07-16 | 1977-11-22 | Grefco, Inc. | Method and apparatus for selectively comminuting particles of a frangible material |
| FR2371233A1 (en) * | 1976-11-23 | 1978-06-16 | Creusot Loire | VACUUM PROJECTION GRINDER |
-
1981
- 1981-04-13 SE SE8102343A patent/SE432719B/en not_active IP Right Cessation
-
1982
- 1982-04-08 WO PCT/SE1982/000117 patent/WO1982003572A1/en active IP Right Grant
- 1982-04-08 JP JP50128382A patent/JPS58500600A/en active Granted
- 1982-04-08 DE DE8282901181T patent/DE3265548D1/en not_active Expired
- 1982-04-08 EP EP19820901181 patent/EP0088762B1/en not_active Expired
- 1982-04-13 CA CA000400899A patent/CA1182089A/en not_active Expired
-
1989
- 1989-01-31 CA CA000589704A patent/CA1261309B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE432719B (en) | 1984-04-16 |
| JPH0251675B2 (en) | 1990-11-08 |
| EP0088762B1 (en) | 1985-08-21 |
| WO1982003572A1 (en) | 1982-10-28 |
| CA1261309B (en) | 1989-09-26 |
| EP0088762A1 (en) | 1983-09-21 |
| DE3265548D1 (en) | 1985-09-26 |
| SE8102343L (en) | 1982-10-14 |
| JPS58500600A (en) | 1983-04-21 |
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