EP0088762B1 - A method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method - Google Patents

A method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method Download PDF

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Publication number
EP0088762B1
EP0088762B1 EP19820901181 EP82901181A EP0088762B1 EP 0088762 B1 EP0088762 B1 EP 0088762B1 EP 19820901181 EP19820901181 EP 19820901181 EP 82901181 A EP82901181 A EP 82901181A EP 0088762 B1 EP0088762 B1 EP 0088762B1
Authority
EP
European Patent Office
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
Application number
EP19820901181
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German (de)
English (en)
French (fr)
Other versions
EP0088762A1 (en
Inventor
Conny BJÖRCK
Per Arne Sigurdsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoganas AB
Original Assignee
Sicomant AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Sicomant AB filed Critical Sicomant AB
Priority to AT82901181T priority Critical patent/ATE14995T1/de
Publication of EP0088762A1 publication Critical patent/EP0088762A1/en
Application granted granted Critical
Publication of EP0088762B1 publication Critical patent/EP0088762B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • 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

Definitions

  • 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 stationary impact surfaces in the mill, the comminution taking place substantially in vacuum.
  • a mill is already known, for example, from US-A-2609993.
  • the invention also relates to an apparatus for performing the method.
  • Mechanical comminution of solid particles may be classified according to the manner of operation of the apparatus that performs the crushing.
  • Crushing or milling may be performed according to two main principles either with pressure that ruptures the particles, as for instance by means of jaw crushers, pendulum mills, tower mills, roller mills and the like, or with kinetic energy that causes bursting of the particles.
  • Typical examples of the latter category are hammer mills, pin mills and jet mills.
  • the amount of energy consumed in crushing by means of kinetic 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 bursts the grains, and energy for the operation of surrounding equipment etc.
  • energy which is consumed for elastic deformation of the grains or particles and which is lost At low velocities, a substantial portion of the supplied energy will be used up for the elastic deformation of the particles, which gives a low efficiency. Furthermore, the elastic deformation will cause the particles to bounce instead of bursting which will cause heavy wear.
  • the energy consumed for elastic deformation amounts only to a small portion of the total energy whereas the high impact energy, if it can be applied as "instantaneously" as possible, gives very high stress concentrations and provides an efficient crushing.
  • the jet mill which has proved to be especially suitable for crushing 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.
  • the jet mill has so far only been used in "exclusive" connections, for instance in the chemical industry and the pharmaceutical industry.
  • the object of the invention is to provide a comparatively simple method which, while involving a low energy consumption, may provide fractions with very small grains (below 10 p). This object has been attained in that the particles are accelerated in vacuum to such a high impact energy against the impact surface 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 characterized by at least one passive or active accelerator operating in vacuum, provided opposite to the rotor and designed 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.
  • the centrifugal mill consists of a housing 11 which is sealed airtight and which contains a crushing chamber 12 wherein there is rotatably arranged a rotor 13 which is provided at each end with an impact surface 14.
  • the rotor is journalled in a heavy bearing 15 and is driven by a motor 16 by means of a suitable transmission 17.
  • the opening 19 of the supply channel 18 in the housing 11 is provided at some distance from an impact surface 20 which is oriented in such a way that it extends substantially in parallel with the rotor impact surface 14 when this is disposed below the outlet opening 19.
  • the impact surface 20 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 following impact surfaces 20' and 20". Below the impact surfaces 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 of the kind illustrated in Fig. 5 which returns the particles to the supply channel 18.
  • the outlet opening may also be connected to a feeding out device (not shown) for batchwise removal of the crushed material from the apparatus.
  • 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.
  • a vacuum is maintained in the accelerator 28, the crushing chamber 12 and spaces communicating therewith, so that the crushing chamber is practically air-void (the air should be evacuated to at least 90%). Thanks to this arrangement the rotor 13 with the impact surfaces 14 will not provide any fan action, and interfering shock waves and uncontrolled turbulency is avoided. The particles instantaneously hit by the impact surface will be crushed 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 crushing takes place.
  • a dosing device 23 provided with a rotor 24 a suitable amount of particles of material is fed to the impact surfaces 14 synchronously with their passing of the outlet opening 19.
  • Figs. 3 and 4 differs from the abovedescribed embodiment in two important respects: two or more rotors are arranged in parallel one above the other, and the particles are supplied to the first crushing chamber 12 with such a high kinetic energy, that a maximum amount of crushing material is supplied for.each "beat".
  • the necessary kinetic energy (which, however, is only about 1/10 of the rotational energy of the impact surface) is obtained by means of an "active" accelerator 28 which, as an example, may consist of a centrifuge, the blades of which are preferably rubber coated in order to reduce wear.
  • the impact surfaces 20 are preferably oriented in such a way, that the particles will fall towards the next rotor 13a which is provided directly below and close to the rotor 13.
  • a supply channel 18 is provided opposite to every other impact surface 20.
  • the impact surfaces 20 have a V-shaped cross- section whereby it will be possible to utilize the second leg of the V by reversing the motor.
  • 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 and comprising two elevators 29 and 30, a silo 31 and a metering accelerator 28. In this case a practically air-void condition is maintained in the complete installation by means of a pump 32 or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
EP19820901181 1981-04-13 1982-04-08 A method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method Expired EP0088762B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82901181T ATE14995T1 (de) 1981-04-13 1982-04-08 Verfahren zum zermahlen von materialteilchen in einer zentrifugalmuehle, sowie vorrichtung zum durchfuehren dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8102343A SE432719B (sv) 1981-04-13 1981-04-13 Sett att finkrossa materialpartiklar i en centrifugalkross och apparat for genomforande av settet
SE8102343 1981-04-13

Publications (2)

Publication Number Publication Date
EP0088762A1 EP0088762A1 (en) 1983-09-21
EP0088762B1 true EP0088762B1 (en) 1985-08-21

Family

ID=20343579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901181 Expired EP0088762B1 (en) 1981-04-13 1982-04-08 A method of finely crushing particles of material in a centrifugal mill and apparatus for performing the method

Country Status (6)

Country Link
EP (1) EP0088762B1 (ja)
JP (1) JPS58500600A (ja)
CA (2) CA1182089A (ja)
DE (1) DE3265548D1 (ja)
SE (1) SE432719B (ja)
WO (1) WO1982003572A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655880A1 (fr) * 1990-01-31 1991-06-21 Framatome Sa Broyeur centrifuge a projection sous vide.
WO2006122543A1 (de) * 2005-05-18 2006-11-23 Tihomir Lelas Mikronisierte mineralische materialien und deren herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE387995C (de) * 1924-01-07 Plauson S Forschungsinstitut G Verfahren zur Zerkleinerung von festen Stoffen auf trockenem Wege bis zu einer Teilchengroesse unter 0.008 mm Durchmesser
US2609993A (en) * 1946-04-09 1952-09-09 Plaroc Inc Impact pulverizing mill, including both cooling and vacuum means
FR2347102A1 (fr) * 1976-04-07 1977-11-04 Planiol Rene Perfectionnements aux broyeurs centrifuges sous vide
US4059231A (en) * 1976-07-16 1977-11-22 Grefco, Inc. Method and apparatus for selectively comminuting particles of a frangible material
FR2371233A1 (fr) * 1976-11-23 1978-06-16 Creusot Loire Broyeur a projection sous vide

Also Published As

Publication number Publication date
SE432719B (sv) 1984-04-16
JPH0251675B2 (ja) 1990-11-08
SE8102343L (sv) 1982-10-14
DE3265548D1 (en) 1985-09-26
CA1182089A (en) 1985-02-05
CA1261309B (en) 1989-09-26
EP0088762A1 (en) 1983-09-21
WO1982003572A1 (en) 1982-10-28
JPS58500600A (ja) 1983-04-21

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